Preparation method and equipment of formaldehyde degradation catalyst based on rare earth metal matrix

Abstract

The invention relates to the field of rare earth-based catalyst production, in particular to a preparation method and equipment of a formaldehyde degradation catalyst based on a rare earth metal matrix, and the equipment comprises an oil bath pan, a driving motor, a circulating assembly, a reciprocating plate and a mixing assembly; a heating wire is installed at the bottom of the oil bath pan, a placing plate is arranged above the heating wire and located at the lower end of the oil bath pan, an adjusting chamber is formed in the inner wall of the oil bath pan, a driving motor is installed in the adjusting chamber, a circulating assembly is arranged above the driving motor, and a reciprocating plate is arranged on the circulating assembly. The driving motor drives the reciprocating plate to slide up and down through the circulation assembly, and then oil circulation is achieved. A mixing assembly is arranged on the inner side of the circumference of the circulating assembly, when the reciprocating plate slides up and down, the reciprocating plate promotes oil liquid to flow through the mixing assembly, circulating flowing of the oil liquid is achieved through rotating motion, the overall uniformity of the oil liquid temperature is guaranteed, and the reaction efficiency and quality are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rare earth-based catalyst production, in particular to a preparation method and equipment of a formaldehyde degradation catalyst based on rare earth metal. BACKGROUND

[0002] The rare earth metal-based formaldehyde degradation catalyst is mainly cerium oxide, which is a material that utilizes the special properties of rare earth elements and the synergistic effect of nanocrystal cores and molecular sieves to achieve efficient degradation of formaldehyde. The catalyst can work effectively under visible light or in the absence of light, and has high catalytic activity and stability.

[0003] The rare earth metal-based formaldehyde degradation catalyst is mainly prepared by sodium hydroxide and cerium nitrate hexahydrate. After the two solutions are uniformly mixed, they are placed in a reaction kettle for reaction. After the reaction is completed, the solid solution oxide is obtained through centrifugation, washing, drying and calcination. Then the solid solution oxide is subjected to a reduction reaction in an oil bath pot. Finally, the filter cake is obtained by filtering through a filter press, and the rare earth metal-based formaldehyde degradation catalyst is prepared after drying the filter cake.

[0004] When the solid solution oxide is subjected to a reduction reaction in an oil bath pot, the oil is heated by the heating wire at the bottom. During the heating process, the temperature is transferred from the heating wire to the surrounding area, causing the oil temperature to rise. However, since the temperature is transferred from the bottom to the top, the oil temperature near the heating wire at the bottom is higher than that at the top, resulting in a temperature difference and causing the oil temperature to be uneven, which makes the temperature of the reaction system unstable, affecting the reaction rate and the yield of the product, and increasing the probability of occurrence of certain side reactions, reducing the selectivity of the main product.

[0005] In view of this, we propose a preparation method and equipment of a rare earth metal-based formaldehyde degradation catalyst. SUMMARY

[0006] The purpose of the present application is to provide a preparation method and equipment of a rare earth metal-based formaldehyde degradation catalyst to solve the problem of uneven oil temperature in an oil bath pot as mentioned in the background.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: Preparation method and equipment of a rare earth metal-based formaldehyde degradation catalyst: The preparation method of a rare earth metal-based formaldehyde degradation catalyst comprises: Step 1, uniformly mix the raw materials in proportion; Prepare a stock solution by uniformly mixing the raw materials in proportion; Step 2, place the uniformly mixed solution in a reaction kettle for static reaction; The prepared stock solution is put into a polytetrafluoroethylene liner, and then transferred into a reaction kettle for standing reaction at 100°C for 24 hours, and then cooled to room temperature; Step 3, centrifuging, washing and drying the cooled reaction product; The cooled reaction product is separated from the solution by centrifugal motion, and then the precipitate is washed and dried; Step 4, the dried product is calcined in a muffle furnace; The purified precipitate is calcined at high temperature in a muffle furnace to form a solid solution oxide; Step 5, the calcined solid solution oxide is uniformly mixed with the auxiliary materials by ultrasonic; The solid solution oxide and the auxiliary materials are put into an ultrasonic machine for ultrasonic mixing to ensure the quality of the subsequent reaction; Step 6, the mixed product is put into an oil bath pot for reduction reaction; The uniformly mixed product is heated in an oil bath pot for reduction reaction to produce the required rare earth metal-based formaldehyde degradation catalyst; Step 7, the mixed solution after reaction is filtered by a suction filter to obtain a filter cake; The catalyst in the mixed solution is collected by a suction filter to form a filter cake; Step 8, the filter cake is dried in a vacuum drying machine to obtain a rare earth metal-based formaldehyde degradation catalyst; After the filter cake is dried to remove the water therein, a rare earth metal-based formaldehyde degradation catalyst is obtained.

[0008] Preferably, the raw materials include sodium hydroxide, cerium nitrate hexahydrate, anhydrous titanium sulfate and cobalt nitrate; the sodium hydroxide solution is uniformly mixed with the cerium nitrate hexahydrate, and then the anhydrous titanium sulfate and the cobalt nitrate are added to prepare a stock solution; The sodium hydroxide solution and the cerium nitrate hexahydrate are the most basic preparation solution, which is used to prepare the most basic cerium oxide. By adding anhydrous titanium sulfate and cobalt nitrate to the cerium oxide, titanium and cobalt elements are added to the cerium oxide, thereby enhancing the catalytic effect on formaldehyde degradation.

[0009] Preferably, the auxiliary materials include reduced graphene oxide powder, ethylene glycol and chloroplatinic acid aqueous solution, the solid solution oxide, the reduced graphene oxide powder and the ethylene glycol are uniformly stirred, and then the chloroplatinic acid aqueous solution is added and put into an ultrasonic machine for ultrasonic mixing; The solid solution oxide is dissolved in ethylene glycol to prepare a solution, and then the reduced graphene oxide powder is added for subsequent reduction reaction, and then the chloroplatinic acid aqueous solution is used as a catalyst to promote the reduction reaction.

[0010] Preferably, the oil bath temperature is 120°C, and the heating time is 3 hours for reduction reaction. The prepared solution is placed in the oil bath pot through the flask, and the reduction reaction is promoted by high-temperature oil bath.

[0011] The rare earth metal-based formaldehyde degradation catalyst preparation equipment comprises an oil bath pot, a driving motor, a circulating assembly, a reciprocating plate and a mixing assembly; a heating wire is arranged at the bottom of the oil bath pot, a placing plate is arranged above the heating wire, the placing plate is located at the lower end of the oil bath pot, and the oil bath pot is manufactured in a split type, so that the heating part and the control part of the oil bath pot are separated, the electronic elements of the control part are prevented from being affected by high temperature during oil bath, and the service life is reduced; when the oil bath pot is used, the placing plate is placed in the oil bath pot, then the raw materials are placed on the placing plate through a flask, and then oil is poured into the inner pot and heated through the heating wire; an adjusting chamber is formed in the inner wall of the oil bath pot, a driving motor is arranged in the adjusting chamber, a circulating assembly is arranged above the driving motor, and a reciprocating plate is arranged on the circulating assembly; when the oil bath pot works, the driving motor drives the reciprocating plate to slide up and down through the circulating assembly, so that oil circulation is realized, the reciprocating plate moves up and down to extract oil at the bottom of the oil bath pot, the oil is sent into the top of the oil bath pot through the adjusting chamber, the oil with a higher temperature at the bottom is mixed with the oil at the top, so that the temperature of the oil at the top is increased and is consistent with the temperature of the oil at the bottom; and the circulating assembly is provided with a mixing assembly on the circumferential inner side, so that the reciprocating plate promotes the flow of the oil through the mixing assembly when the reciprocating plate slides up and down, the mixing assembly mixes the oil in the oil bath pot, and the mixed oil is uniformly mixed, so that the uniformity of the overall oil temperature is ensured.

[0012] Preferably, the adjusting chamber is composed of working cavities and a driving cavity, the working cavities are two, the working cavities and the driving cavity are in communication with each other, an equalizing hole is arranged between the two working cavities, an air exchange hole is arranged between the two working cavities and the driving cavity, the equalizing hole is used for balancing the internal air pressure of the working cavity when the reciprocating plate moves upward, so as to ensure the stable movement of the reciprocating plate, and the air exchange hole is used for balancing the internal air pressure of the working cavity when the reciprocating plate moves downward.

[0013] Preferably, the circulating assembly comprises a driving wheel, a driven wheel, a driving shaft, a swing block and a one-way valve; the driving wheel is located in the driving cavity and is fixedly connected with the driving motor, symmetrical driving wheels are installed on both sides of the driving wheel, and the driving motor is started to drive the driving wheel to rotate synchronously when the oil bath pot is working; the driving wheel drives the symmetrical driving wheels installed on both sides to rotate synchronously when the driving wheel rotates; the two driving wheels are rotatably installed at the bottom end of the working cavity, and the driving wheels are fixedly connected with the driving shaft; the driving shaft is provided with staggered grooves, and the reciprocating plate is slidably installed on the driving shaft; one end of the reciprocating plate is rotatably connected with the swing block; the other end of the swing block is located in the staggered grooves, and the swing block has a rhombus structure as a whole; the driving wheel drives the driving shaft to rotate synchronously, the driving shaft pushes and extrudes the swing block through the staggered grooves, the swing block reciprocates under the action of the staggered grooves, and the swing block drives the reciprocating plate to reciprocate synchronously, The reciprocating plate is provided with inclined grooves on the circumferential inner side, and the one-way valve is arranged on the circumferential inner side of the reciprocating plate; the one-way valve comprises a one-way liquid inlet valve and a one-way liquid outlet valve, the one-way liquid inlet valve is located below the placement plate, the one-way liquid outlet valve is located above the placement plate and below the pressure equalizing hole; the one-way valve limits the flow direction of the oil by one-way flow, when the reciprocating plate moves vertically upward from below, the reciprocating plate extracts the oil with high oil temperature at the bottom through the one-way liquid inlet valve, the oil enters the working cavity and moves vertically upward under the action of the reciprocating plate, when the oil moves to the one-way liquid outlet valve under the action of the reciprocating plate, the oil with high oil temperature enters the top of the oil bath pot through the one-way liquid outlet valve and mixes with the oil with low oil temperature, so that the oil temperature at the top is increased, and when the reciprocating plate transports the oil for multiple times, the overall oil temperature is kept consistent.

[0014] Preferably, the reciprocating plate is provided with a concave surface, the concave surface of the reciprocating plate changes the shape of the working cavity, so that the flow of the oil is smoother, thereby improving the transportation efficiency of the oil, and the design of the concave surface can facilitate the adjustment of the compression ratio, adapt to different working conditions and requirements, ensure the suction efficiency of the reciprocating plate for the oil, and thereby ensure the transportation efficiency.

[0015] Preferably, the mixing assembly comprises a reciprocating rack, a transfer wheel, a rotating shaft, a fixed shaft and mixing blades; the reciprocating rack is located below the placement plate, the two ends of the reciprocating rack are respectively located in two working cavities, the reciprocating rack is in sliding connection with the working cavities, the reciprocating rack is provided with inclined grooves matched with the reciprocating plate, when the reciprocating plate reciprocates, the reciprocating plate extrudes the inclined grooves on the reciprocating rack through the inclined grooves, thereby pushing the reciprocating rack to slide, one side of the reciprocating rack is provided with the transfer wheel; the transfer wheel is rotatably installed with the placement plate, the transfer wheel is fixedly connected with the rotating shaft; the rotating shaft is provided below the fixed shaft, the rotating shaft and the fixed shaft are provided with the mixing blades, the two ends of the mixing blades are connected with the rotating shaft and the fixed shaft respectively, the reciprocating rack is engaged with the transfer wheel when sliding, thereby driving the transfer wheel to rotate, the rotating shaft is synchronously rotated when the transfer wheel rotates, the rotating shaft drives the mixing blades slidably installed thereon to synchronously rotate, the mixing blades mix the oil at the bottom to make the oil temperature uniform, the mixing blades rotate relative to the fixed shaft; the rotating shaft is provided with sliding grooves in an annular array, the mixing blades are provided with sliding blocks matched with the sliding grooves; the fixed shaft is provided with threads, the mixing blades are provided with screw grooves matched with the threads, the screw grooves on the mixing blades are engaged with the threads on the fixed shaft when the mixing blades rotate, the mixing blades slide under the action of the thread engagement, thereby mixing the oil in the vertical direction, at the same time, the oil fed from the top is mixed, thereby making the oil temperature at the top rise, so that the temperature of the top and the bottom is consistent.

[0016] Preferably, the mixing blades are provided with turbulence holes in a circular truncated cone structure, the turbulence holes are used for the flow of the oil, the mixing blades do not affect the flow of the oil, at the same time, when the turbulence holes synchronously rotate with the mixing blades, the disturbance effect of the mixing blades on the oil is enhanced, thereby uniformly mixing the oil at the bottom, at the same time, when the mixing blades vertically slide up and down, the oil is pressurized and transported through the turbulence pieces, so that the oil is more uniformly mixed in the vertical direction.

[0017] Compared with the prior art, the application has the following beneficial effects: 1. The preparation method and equipment of the formaldehyde degradation catalyst based on the rare earth metal base produce the formaldehyde degradation catalyst containing titanium elements and cobalt elements, and improve the catalytic efficiency and catalytic quality of formaldehyde degradation.

[0018] 2. The preparation method and equipment of the formaldehyde degradation catalyst based on the rare earth metal base guarantee the uniformity of the overall oil temperature through the circulation assembly and the mixing assembly, thereby guaranteeing the stability of the reaction, and improving the reaction quality and reaction efficiency.

[0019] 3. The preparation method and equipment of the formaldehyde degradation catalyst based on rare earth metal, the oil liquid is mixed in multiple angles and multiple directions by the mixing assembly, so that the flowability of the oil liquid is improved, and the uniformity of the overall oil liquid temperature is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The flow chart of the method of the present application; Figure 2 The half sectional view of the oil bath pot of the present application; Figure 3 The partial enlarged view of point A of the present application; Figure 2 Figure 4 The partial enlarged view of point B of the present application; Figure 2 Figure 5 The horizontal sectional view of the oil bath pot of the present application; Figure 6 The partial enlarged view of point C of the present application; Figure 5 Figure 7 The vertical sectional view of the oil bath pot of the present application; Figure 8 The overall schematic view of the circulating assembly and the mixing assembly of the present application; Figure 9 The overall schematic view of the circulating assembly of the present application; Figure 10 The schematic view of the driving shaft cooperating with the swing block of the present application; Figure 11 The vertical sectional view of the adjusting chamber of the present application; Figure 12 The partial enlarged view of point D of the present application; Figure 11 Figure 13 The overall view of the mixing assembly of the present application; Figure 14 The sectional view of the mixing assembly of the present application; Figure 15 The partial enlarged view of point E of the present application. Figure 14

[0021] In the drawings: 1, oil bath pot; 11, heating wire; 12, placing plate; 13, adjusting chamber; 131, working cavity; 1311, pressure equalizing hole; 132, driving cavity; 1321, air exchange hole; 2, driving motor; 3, circulating assembly; 31, driving wheel; 32, driven wheel; 33, driving shaft; 331, staggered groove; 34, swing block; 341, rhombus structure; 35, one-way valve; 351, one-way liquid inlet valve; 352, one-way liquid outlet valve; ​​​​​4. Reciprocating plate; 41. Inclined groove; 42. Concave surface; 5. Mixing component; 51. Reciprocating rack; 52. Central rotating wheel; 53. Rotating shaft; 531. Slide groove; 54. Fixed shaft; 541. Thread; 55. Mixing blade; 551. Slider; 552. Screw groove; 553. Turbidity hole. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Rare earth metal-based formaldehyde degradation catalysts are mainly prepared by mixing sodium hydroxide and cerium nitrate hexahydrate. The two solutions are uniformly mixed and placed in a reaction vessel for reaction. After the reaction is completed, the solid solution oxide is obtained by centrifugation, washing, drying and calcination. Then, the solid solution oxide is reduced in an oil bath. Finally, the filter cake is obtained by filtration and drying.

[0024] When reducing solid solution oxides in an oil bath, the oil is heated by a heating wire at the bottom. During heating, the temperature is transferred from the heating wire to the surrounding area, causing the oil temperature to rise. However, because the temperature is transferred from the bottom upwards, the oil temperature near the heating wire at the bottom is higher than that at the top, resulting in a temperature difference. This leads to uneven oil temperature, making the temperature of the reaction system unstable, which affects the reaction rate and product yield. At the same time, it increases the probability of certain side reactions and reduces the selectivity of the main product.

[0025] The present invention provides a technical solution: like Figures 1 to 15 As shown, the preparation method and equipment for formaldehyde degradation catalysts based on rare earth metals are as follows: The preparation method of formaldehyde degradation catalyst based on rare earth metals includes: Step 1: Mix the raw materials evenly according to the specified proportions; Step 2: Place the uniformly mixed solution into the reaction vessel and allow it to stand for reaction. Step 3: Centrifuge, wash, and dry the cooled reaction product; Step 4: Place the dried product into a muffle furnace for calcination; Step 5: Ultrasonically mix the calcined solid solution oxide with the excipients; Step 6: Place the mixed product into an oil bath for reduction reaction; Step 7, the mixed solution of the reaction is completed by filtering through the filter press to obtain the filter cake; Step 8, the filter cake is placed in the vacuum drying machine for drying to obtain the rare earth metal-based formaldehyde degradation catalyst; Specifically, the raw materials are uniformly mixed in proportion to prepare a stock solution, the prepared stock solution is placed in a polytetrafluoroethylene liner, and then transferred into a reaction kettle for standing reaction at 100℃ for 24 hours. After cooling to room temperature, precipitates are generated in the reaction kettle after standing reaction. After cooling, the reaction product is separated from the solution by centrifugal motion, and then the precipitate is washed and dried. The precipitate is purified to avoid impurities attached to the surface of the precipitate. The purified precipitate is placed in a muffle furnace for high temperature calcination to generate a solid solution oxide. The solid solution oxide and the auxiliary material are placed in an ultrasonic machine for ultrasonic mixing to ensure the quality of the subsequent reaction. The uniformly mixed product is placed in an oil bath for heating to produce the required rare earth metal-based formaldehyde degradation catalyst by reduction reaction. The catalyst in the mixed solution is collected by filtering through the filter press to obtain the rare earth metal-based formaldehyde degradation catalyst after drying to remove the water in the filter cake.

[0026] Preferably, the raw materials include sodium hydroxide, cerium nitrate hexahydrate, anhydrous titanium sulfate, and cobalt nitrate; the sodium hydroxide solution is uniformly mixed with the cerium nitrate hexahydrate, and then the anhydrous titanium sulfate and the cobalt nitrate are added to prepare the stock solution; the anhydrous titanium sulfate and the cobalt nitrate are added to prepare the CeTiCoOx solid solution oxide.

[0027] Specifically, the sodium hydroxide solution and the cerium nitrate hexahydrate are the most basic preparation solution for preparing the most basic cerium oxide. By adding the anhydrous titanium sulfate and the cobalt nitrate to the cerium oxide, titanium elements and cobalt are added to the cerium oxide, thereby enhancing the catalytic effect on formaldehyde degradation.

[0028] Preferably, the auxiliary material includes reduced graphene oxide powder, ethylene glycol, and chloroplatinic acid aqueous solution. The solid solution oxide, the reduced graphene oxide powder, and the ethylene glycol are uniformly stirred, and then the chloroplatinic acid aqueous solution is added and placed in an ultrasonic machine for ultrasonic mixing. Specifically, the solid solution oxide is dissolved in ethylene glycol to prepare a solution, and then the reduced graphene oxide powder is added for subsequent reduction reaction. Then, the chloroplatinic acid aqueous solution is used as a catalyst to promote the reduction reaction.

[0029] Preferably, the oil bath temperature is 120℃, and the heating time is 3 hours for reduction reaction. Specifically, the prepared solution is placed in an oil bath through a flask, and high-temperature oil bath is used to promote the reduction reaction.

[0030] Figure 1For the process flow chart of the application, the production process of the rare earth metal-based formaldehyde degradation catalyst is introduced in detail. At room temperature, take the fully stirred sodium hydroxide solution, then add cerium nitrate hexahydrate, anhydrous titanium sulfate and cobalt nitrate to the sodium hydroxide solution and stir well. After being stirred well, they are transferred into a polytetrafluoroethylene liner and placed into a reaction kettle. After standing at 100℃ for 24h and cooling to room temperature, the reaction completed solution is centrifuged, washed, and then dried at 80℃ in air atmosphere for 12h to obtain pure precipitate. Then the precipitate is placed in a muffle furnace at 650℃ in air atmosphere for 4h to obtain CeTiCoOx solid solution oxide. Then the CeTiCoOx solid solution oxide powder, reduced graphene oxide powder and ethylene glycol are uniformly stirred, and chloroplatinic acid aqueous solution is added and uniformly mixed by ultrasonic. It is heated and stirred in an oil bath at 140℃ for 3h for reduction reaction. After the mixed solution is cooled to room temperature, it is filtered to obtain filter cake which is vacuum dried at 40℃ for 2h to obtain Pt / CeTiCoOx / RGO catalyst.

[0031] As shown in Figures 2 to 15 A rare earth metal-based formaldehyde degradation catalyst preparation equipment: including oil bath pot 1, drive motor 2, circulating assembly 3, reciprocating plate 4 and mixing assembly 5; the oil bath pot 1 bottom is installed with heating wire 11, the heating wire 11 upper side is equipped with placing plate 12, the placing plate 12 is located in the oil bath pot 1 lower end, the oil bath pot 1 inner wall is equipped with adjusting chamber 13, the adjusting chamber 13 is installed with drive motor 2, the drive motor 2 upper side is equipped with circulating assembly 3, the circulating assembly 3 is equipped with reciprocating plate 4, the oil bath pot 1 works, the drive motor 2 drives reciprocating plate 4 to slide up and down through circulating assembly 3, and then realizes oil circulation; the circulating assembly 3 circumferential inner side is equipped with mixing assembly 5, the reciprocating plate 4 slides up and down, the reciprocating plate 4 promotes oil flow through mixing assembly 5; Specifically, the oil bath pot 1 is installed with heating wire 11 at the bottom, and the placing plate 12 is arranged above the heating wire 11. The placing plate 12 is located at the lower end of the oil bath pot 1. The oil bath pot 1 is manufactured in a split type, which separates the heating part from the control part, so as to avoid the high temperature during oil bath from affecting the electronic elements of the control part and reducing the service life. When the oil bath pot 1 is used, the placing plate 12 is placed in the oil bath pot 1, and then the raw materials are placed on the placing plate 12 through the flask, and then the oil is poured into the inner pot and heated through the heating wire 11. The adjusting chamber 13 is arranged on the inner wall of the oil bath pot 1, the driving motor 2 is installed in the adjusting chamber 13, the circulating assembly 3 is arranged above the driving motor 2, and the reciprocating plate 4 is arranged on the circulating assembly 3. When the oil bath pot 1 works, the driving motor 2 drives the reciprocating plate 4 to slide up and down through the circulating assembly 3, so as to realize the circulation of the oil. The reciprocating plate 4 moves up and down to extract the oil at the bottom of the oil bath pot 1, and the oil is sent into the top of the oil bath pot 1 through the adjusting chamber 13, so that the oil with high temperature at the bottom is mixed with the oil at the top, and then the temperature of the oil at the top is increased to be consistent with the temperature of the oil at the bottom. The mixing assembly 5 is arranged on the circumferential inner side of the circulating assembly 3. When the reciprocating plate 4 slides up and down, the reciprocating plate 4 promotes the flow of the oil through the mixing assembly 5. The mixing assembly 5 mixes the oil in the oil bath pot 1, so that the mixed oil is uniformly mixed to ensure the uniformity of the overall oil temperature.

[0032] In the embodiment, the adjusting chamber 13 is composed of working cavities 131 and driving cavities 132. The working cavities 131 are two, and the working cavities 131 and the driving cavities 132 are communicated with each other. The two working cavities 131 are provided with pressure equalizing holes 1311, and the working cavities 131 and the driving cavities 132 are provided with air exchange holes 1321. The pressure equalizing holes 1311 are used to balance the internal pressure of the working cavities 131 when the reciprocating plate 4 moves upward, so as to ensure the stable movement of the reciprocating plate 4. The air exchange holes 1321 are used to balance the internal pressure of the working cavities 131 when the reciprocating plate 4 moves downward.

[0033] The circulating assembly 3 comprises a driving wheel 31, a driven wheel 32, a driving shaft 33, a swing block 34 and a one-way valve 35; the driving wheel 31 is located in the driving cavity 132 and is fixedly connected with the driving motor 2, and the driving wheel 31 is symmetrically provided with the driven wheels 32 on both sides; the two driven wheels 32 are rotatably installed at the bottom end of the working cavity 131, and the driven wheels 32 are fixedly connected with the driving shaft 33; the driving shaft 33 is provided with staggered grooves 331, and the reciprocating plate 4 is slidably installed on the driving shaft 33; one end of the reciprocating plate 4 is rotatably connected with the swing block 34; the other end of the swing block 34 is located in the staggered grooves 331, and the swing block 34 has a whole rhombic structure 341; the reciprocating plate 4 is two, the two reciprocating plates 4 are staggered, and the circumferential inner side of the reciprocating plate 4 is symmetrically provided with inclined grooves 41; the circumferential inner side of the reciprocating plate 4 is provided with the one-way valve 35, the one-way valve 35 is divided into a one-way inlet valve 351 and a one-way outlet valve 352, the one-way inlet valve 351 is located below the placement plate 12, the one-way outlet valve 352 is located above the placement plate 12 and below the pressure equalizing hole 1311; Specifically, the driving wheel 31 is located inside the drive chamber 132 and is fixedly connected to the drive motor 2. Driven wheels 32 are symmetrically mounted on both sides of the driving wheel 31. When the oil bath 1 is working, the drive motor 2 starts, thereby driving the driving wheel 31 to rotate synchronously. The rotation of the driving wheel 31 drives the symmetrically mounted driven wheels 32 to rotate synchronously. The two driven wheels 32 are rotatably mounted at the bottom of the working chamber 131 and are fixedly connected to the drive shaft 33. The drive shaft 33 has interlaced grooves 331, and a reciprocating plate 4 is slidably mounted on the drive shaft 33. The reciprocating plate 4 is rotatably connected to one end of the rocker block 34; the other end of the rocker block 34 is... Within the interlaced groove 331, the rocker block 34 has an overall rhomboid structure 341. When the driven wheel 32 rotates, it drives the drive shaft 33 to rotate synchronously. The drive shaft 33, through the interlaced groove 331, pushes the rocker block 34. The rocker block 34 slides back and forth under the action of the interlaced groove 331, and the rocker block 34 drives the reciprocating plate 4 to reciprocate synchronously. There are two reciprocating plates 4, each with a limiting block. A limiting groove is provided on the inner wall of the working cavity 131. The reciprocating plates 4 slide within the working cavity 131 through the cooperation of the limiting block and the limiting groove, maintaining the stability of their own movement. The two reciprocating plates 4 are arranged alternately. The inner circumference of the reciprocating plate 4 is symmetrically provided with inclined grooves 41; the inner circumference of the reciprocating plate 4 is provided with a one-way valve 35, which is divided into a one-way inlet valve 351 and a one-way outlet valve 352. The one-way inlet valve 351 is located below the placement plate 12, and the one-way outlet valve 352 is located above the placement plate 12 and below the pressure equalization hole 1311. The one-way outlet valve 352 is located below the pressure equalization hole 1311, so that when the reciprocating plate 4 reaches the pressure equalization hole 1311, it has already entered the oil bath 1 through the one-way outlet valve 352. At the same time, the pressure equalization hole 1311 is smaller than the inner diameter of the one-way outlet valve 352, thereby ensuring that the working chamber 131 is within the oil bath 1. The pressure; the one-way valve 35 restricts the flow direction of the oil by one-way flow. When the reciprocating plate 4 moves vertically upward from below, the reciprocating plate 4 draws the oil with higher temperature at the bottom through the one-way inlet valve 351. The oil enters the working chamber 131 and moves vertically upward under the action of the reciprocating plate 4. When the oil moves to the one-way outlet valve 352 under the action of the reciprocating plate 4, the oil with higher temperature enters the top of the oil bath 1 through the one-way outlet valve 352 and mixes with the oil with lower temperature, thereby raising the oil temperature at the top. When the reciprocating plate 4 delivers the oil multiple times, the overall oil temperature remains consistent. Two reciprocating plates 4 are staggered, when one reciprocating plate 4 moves upward from the bottom of the working cavity 131, the other reciprocating plate 4 moves downward from the top of the working cavity 131, the upward reciprocating plate 4 extrudes the air in the working cavity 131, the downward reciprocating plate 4 sucks the air in the working cavity 131, and the overall air pressure in the two working cavities 131 is maintained stable through the pressure equalizing hole 1311, and at the same time, when the reciprocating plate 4 moves downward, the air at the lower end of the working cavity 131 is discharged into the driving cavity 132 through the air exchange hole 1321, thereby maintaining the stability of the movement.

[0034] In the embodiment, the concave surface 42 is arranged on the reciprocating plate 4. Specifically, the concave surface 42 of the reciprocating plate 4 changes the shape of the working cavity 131, so that the flow of oil is more smooth, thereby improving the delivery efficiency of the oil, and at the same time, the design of the concave surface 42 can facilitate the adjustment of the compression ratio, adapt to different working conditions and requirements, and ensure the suction efficiency of the reciprocating plate 4 to the oil, thereby ensuring the delivery efficiency.

[0035] In the embodiment, the mixing assembly 5 comprises a reciprocating rack 51, a transfer wheel 52, a rotating shaft 53, a fixed shaft 54 and a mixing blade 55; the reciprocating rack 51 is located below the placement plate 12, both ends of the reciprocating rack 51 are located in the two working cavities 131 respectively, the reciprocating rack 51 is provided with inclined grooves 41 matched with the reciprocating plate 4, and the reciprocating rack 51 is provided with the transfer wheel 52 on one side; the transfer wheel 52 is rotatably installed with the placement plate 12, and the transfer wheel 52 is fixedly connected with the rotating shaft 53; the rotating shaft 53 is provided below the fixed shaft 54, and the rotating shaft 53 and the fixed shaft 54 are provided with the mixing blade 55 therebetween, both ends of the mixing blade 55 are connected with the rotating shaft 53 and the fixed shaft 54 respectively; the rotating shaft 53 is provided with a plurality of slide grooves 531 arranged in annular array, the mixing blade 55 is provided with a plurality of slide blocks 551 matched with the slide grooves 531; the fixed shaft 54 is provided with a plurality of threads 541, and the mixing blade 55 is provided with a plurality of screw grooves 552 matched with the threads 541; Specific, reciprocating rack 51 is located below the placement plate 12, reciprocating rack 51 both ends are located in two working cavities 131, reciprocating rack 51 and working cavity 131 sliding connection, reciprocating rack 51 is provided with inclined slot 41 matched with reciprocating plate 4, when reciprocating plate 4 reciprocating, reciprocating plate 4 is extruded on reciprocating rack 51 by inclined slot 41, and then pushes reciprocating rack 51 to slide, one side of reciprocating rack 51 is provided with transfer wheel 52; Transfer wheel 52 is rotatably installed with placement plate 12, transfer wheel 52 is fixedly connected with rotating shaft 53; Rotating shaft 53 below is provided with fixed shaft 54, and mixing blade 55 is arranged between rotating shaft 53 and fixed shaft 54, both ends of mixing blade 55 are connected with rotating shaft 53 and fixed shaft 54 respectively, reciprocating rack 51 is engaged with transfer wheel 52 when sliding, and then drives transfer wheel 52 to rotate, transfer wheel 52 drives rotating shaft 53 to rotate synchronously when rotating, rotating shaft 53 drives mixing blade 55 slidingly installed thereon to rotate synchronously, and the bottom oil is mixed by mixing blade 55, so that the bottom oil temperature is uniform, and the mixing impeller rotates relative to fixed shaft 54; Rotating shaft 53 is annularly arranged with sliding groove 531, and sliding block 551 matched with sliding groove 531 is arranged on mixing blade 55; Thread 541 is arranged on fixed shaft 54, and screw groove 552 matched with thread 541 is arranged on mixing blade 55, screw groove 552 on mixing blade 55 is engaged with thread 541 on fixed shaft 54 when mixing blade 55 rotates, and mixing blade 55 slides under the engagement of thread 541, and then mixes the oil in the vertical direction, and simultaneously, the oil sent into the top is mixed, so that the temperature of the top oil rises, and the temperature of the top and bottom is consistent. The placement plate 12 is located at the lower end of the oil bath pan 1, and then the reciprocating rack 51 located below is located at the lower end of the working cavity 131. At the same time, the reciprocating rack 51 has only one end located in the working cavity 131, and the other end located in the opening on the inner wall of the working cavity 131. When the reciprocating plate 4 moves vertically upward, the reciprocating plate 4 extrudes the reciprocating rack 51 to slide horizontally through the inclined slot 41. The end located in the working cavity 131 slides into the opening on the inner wall of the working cavity 131. The reciprocating rack 51 located in the opening on the inner wall slides into the working cavity 131. At this time, the other reciprocating plate 4 moves vertically downward. Since the reciprocating rack 51 is located at the lower end of the working cavity 131, when the upward reciprocating rack 51 pushes the reciprocating rack 51 to slide, the downward reciprocating rack 51 will not contact the reciprocating rack 51 until the reciprocating rack 51 slides is completed, and then pushes the reciprocating rack 51 to slide reversely.

[0036] In the embodiment, the mixing blade 55 is provided with a spoiler hole 553, which is a circular truncated cone structure. Specifically, the disturbance hole 553 is used for the flow of oil, avoiding the influence of the mixing blade 55 on the flow of oil, and at the same time, the disturbance hole 553 enhances the disturbance effect of the mixing blade 55 on the oil when it rotates synchronously with the mixing blade 55, thereby making the bottom oil uniformly mixed, and when the mixing blade 55 slides vertically up and down, the oil is pressurized and transported by the disturbance piece, so that the oil is mixed more uniformly in the vertical direction.

[0037] The rare earth metal-based formaldehyde degradation catalyst preparation equipment of the present application is used, the solution is placed on the placing plate 12 of the oil bath through the flask, the oil bath 1 is started to heat the oil, at the same time, the driving motor 2 is started, the driving motor 2 drives the driving wheel 31 to rotate, the driving wheel 31 is engaged with the two driven wheels 32, thereby driving the two driven wheels 32 to rotate synchronously, the driven wheel 32 rotates to drive the driving shaft 33 to rotate synchronously, the driving shaft 33 extrudes the swing block 34 through the staggered groove 331 to drive the swing block 34 to slide vertically, the swing block 34 drives the reciprocating plate 4 to move synchronously, when the reciprocating plate 4 moves vertically downward from the top, the reciprocating plate 4 passes through the one-way liquid inlet valve 351, the reciprocating plate 4 sucks the oil at the bottom of the oil bath 1 with higher temperature into the working cavity 131 through the one-way liquid inlet valve 351, then the reciprocating plate 4 slides vertically upward to drive the oil to move vertically upward synchronously, when the oil moves to the one-way liquid outlet valve 352, the oil enters the oil bath 1 from the one-way liquid outlet valve 352 under the action of pressure to mix with the oil at the top with lower temperature; At the same time, when one reciprocating plate 4 moves vertically downward from the top, the reciprocating plate 4 extrudes the reciprocating rack 51 to slide horizontally through the inclined groove 41, the reciprocating rack 51 is engaged with the transfer wheel 52, thereby driving the transfer wheel 52 to rotate, the transfer wheel 52 drives the mixing blade 55 to rotate synchronously, at the same time, the mixing blade 55 is connected through the thread 541 to slide vertically along the fixed shaft 54; when the reciprocating plate 4 extrudes the reciprocating rack 51 to complete the upward movement, the other reciprocating plate 4 moves downward from the top to contact the reciprocating rack 51, thereby pushing the reciprocating rack 51 to slide reversely through the inclined groove 41, the reciprocating rack 51 drives the transfer wheel 52 to rotate, the transfer wheel 52 drives the mixing blade 55 to rotate through the rotating shaft 53, at the same time, the mixing blade 55 slides reversely along the fixed shaft 54.

[0038] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, the above examples and descriptions in the specification are only preferred examples of the present application, and are not intended to limit the present application, various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for the preparation of a catalyst for the degradation of formaldehyde based on rare earth metals, characterized in that, Comprising: Step 1, uniformly mix the raw materials in proportion; After uniformly mixing the raw materials in proportion, prepare the stock solution; Step 2, place the uniformly mixed solution into the reaction kettle for static reaction; After the preparation of the stock solution is completed, it is placed into a polytetrafluoroethylene liner, and then transferred into a reaction kettle for a 100℃, 24-hour static reaction, and then cooled to room temperature; Step 3, centrifuge, wash and dry the cooled reaction product; After cooling, the reaction product is separated from the solution by centrifugal motion, and then the precipitate is washed and dried; Step 4, place the dried product into a muffle furnace for calcination; Place the purified precipitate into a muffle furnace for high-temperature calcination to form a solid solution oxide; Step 5, uniformly mix the calcined solid solution oxide with the auxiliary materials using ultrasonic; Place the solid solution oxide and auxiliary materials into an ultrasonic machine for ultrasonic mixing to ensure the quality of the subsequent reaction; Step 6, place the mixed product into an oil bath pot for reduction reaction; Place the uniformly mixed product into an oil bath pot for heating and reduction reaction to produce the desired rare earth metal-based formaldehyde degradation catalyst; Step 7, filter the reaction completed mixed solution through a suction filter to obtain a filter cake; Collect the catalyst in the mixed solution by filtering it through a suction filter to obtain a filter cake; Step 8, dry the filter cake in a vacuum drying machine to obtain a rare earth metal-based formaldehyde degradation catalyst; After drying the filter cake to remove the water content, a rare earth metal-based formaldehyde degradation catalyst is obtained.

2. The method of claim 1, wherein: The raw materials include sodium hydroxide, cerium nitrate hexahydrate, anhydrous titanium sulfate, and cobalt nitrate; after uniformly mixing the sodium hydroxide solution and cerium nitrate hexahydrate, add anhydrous titanium sulfate and cobalt nitrate to prepare the stock solution; The sodium hydroxide solution and cerium nitrate hexahydrate are the most basic preparation solution, used to prepare the most basic cerium oxide, by adding anhydrous titanium sulfate and cobalt nitrate to the cerium oxide to add titanium and cobalt elements, thereby enhancing the catalytic effect on formaldehyde degradation.

3. The method of claim 1, wherein: The auxiliary materials include reduced graphene oxide powder, ethylene glycol, and chloroplatinic acid aqueous solution; after uniformly stirring the solid solution oxide, reduced graphene oxide powder, and ethylene glycol, add the chloroplatinic acid aqueous solution and place it into an ultrasonic machine for ultrasonic mixing; Dissolve the solid solution oxide in ethylene glycol to prepare a solution, then add reduced graphene oxide powder for subsequent reduction reaction, and then use chloroplatinic acid aqueous solution as a catalyst to promote the reduction reaction.

4. The method of claim 1, wherein: The oil bath temperature of the oil bath pot is 120℃, and the heating time is 3 hours for reduction reaction; Place the prepared solution into the oil bath pot through the flask, and promote the reduction reaction by high-temperature oil bath.

5. A rare earth metal-based catalyst preparation device for the production of a catalyst for the degradation of formaldehyde according to any one of claims 1 to 4, characterized in that: It comprises an oil bath pot (1), a driving motor (2), a circulating assembly (3), a reciprocating plate (4), and a mixing assembly (5); The oil bath pot (1) bottom is provided with heating wire (11), the heating wire (11) top is equipped with placing plate (12), the placing plate (12) is located oil bath pot (1) lower end;The oil bath pot (1) inner wall is provided with adjusting chamber (13), the adjusting chamber (13) is installed in drive motor (2), the drive motor (2) top is equipped with circulation assembly (3), the circulation assembly (3) top is equipped with reciprocating plate (4), the oil bath pot (1) work, the drive motor (2) through circulation assembly (3) drive reciprocating plate (4) up and down sliding, further realize oil circulation;The circulation assembly (3) circumferential inner side is equipped with mixing assembly (5), when reciprocating plate (4) up and down sliding, reciprocating plate (4) promotes oil flow through mixing assembly (5).

6. The manufacturing apparatus of claim 5, wherein: The adjusting chamber (13) is composed of working cavity (131) and drive cavity (132), the working cavity (131) is two, two the working cavity (131) and drive cavity (132) are communicated, two the working cavity (131) is equipped with pressure equalizing hole (1311), two the working cavity (131) and drive cavity (132) are equipped with air hole (1321).

7. The manufacturing apparatus of claim 6, wherein: The circulation assembly (3) includes driving wheel (31), driven wheel (32), drive shaft (33), swing block (34) and check valve (35). The driving wheel (31) is located in the drive cavity (132), and is fixedly connected with the drive motor (2), the driving wheel (31) both sides are symmetrically installed with driven wheel (32); Two the driven wheel (32) is rotatably installed at the bottom of the working cavity (131), the driven wheel (32) is fixedly connected with the drive shaft (33); The drive shaft (33) is provided with staggered grooves (331), and the reciprocating plate (4) is slidably installed on the drive shaft (33). The reciprocating plate (4) is rotatably connected with one end of the swing block (34). The other end of the swing block (34) is located in the staggered groove (331), and the swing block (34) has a whole diamond structure (341). The reciprocating plate (4) is two, two the reciprocating plate (4) staggered arrangement, the reciprocating plate (4) circumferential inner side is symmetrically provided with inclined groove (41); The reciprocating plate (4) circumferential inner side is provided with check valve (35), the check valve (35) is divided into one-way inlet valve (351) and one-way outlet valve (352), the one-way inlet valve (351) is located below the placing plate (12), the one-way outlet valve (352) is located above the placing plate (12), and is located below the pressure equalizing hole (1311).

8. The manufacturing apparatus of claim 7, wherein: The reciprocating plate (4) is provided with concave surface (42).

9. The manufacturing apparatus of claim 8, wherein: The mixing assembly (5) includes reciprocating rack (51), transfer wheel (52), rotating shaft (53), fixed shaft (54) and mixing blade (55). The reciprocating rack (51) is located below the placement plate (12), two ends of the reciprocating rack (51) are located in two working cavities (131) respectively, the reciprocating rack (51) is provided with inclined grooves (41) matched with the reciprocating plate (4), and one side of the reciprocating rack (51) is provided with a transfer wheel (52). The transfer wheel (52) is rotatably installed with the placement plate (12), and the transfer wheel (52) is fixedly connected with a rotating shaft (53). The rotating shaft (53) is provided below with a fixed shaft (54), and the rotating shaft (53) and the fixed shaft (54) are provided with mixing blades (55) therebetween, and two ends of the mixing blades (55) are connected with the rotating shaft (53) and the fixed shaft (54) respectively. The rotating shaft (53) is provided with sliding grooves (531) in an annular array, and the mixing blades (55) are provided with sliding blocks (551) matched with the sliding grooves (531). The fixed shaft (54) is provided with threads (541), and the mixing blades (55) are provided with screw grooves (552) matched with the threads (541).

10. The manufacturing apparatus of claim 9, wherein: The mixing blades (55) are provided with turbulence holes (553), and the turbulence holes (553) are circular truncated cone structures.

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