384 results about "Ammoxidation" patented technology

The invention provides a method for synthesizing adiponitrile through selective ammoxidation of cyclohexene oxide. The invention aims to simulate and optimize the process of synthesizing adiponitrile from cyclohexene oxide by a one-step direct ammoxidation method to develop a novel multiphase composite metal vanadium-based oxide catalyst, the composition of the catalyst is CoaVbPcModMNOx / TiO2, the active elements of the catalyst comprise vanadium element V, cobalt element Co, phosphorus element P and molybdenum element Mo, M is an auxiliary metal element (Mn, Cr, Fe or Ni), and N is an alkali metal (Na, K or Cs); the value range of a is 0.2 to 1.2; the value range of b is 0.8 to 1.5; the value range of c is 0.1 to 0.23; the value range of d is 0.07 to 0.35; x is the oxygen atom proportion required by the metal oxidation valence state. The catalyst has the advantages of simple preparation, good cycling stability, high yield and the like. The yield and the product purity of the adiponitrile are improved, the energy consumption in the production process of the adiponitrile is reduced, and the breakthrough of the production technology of the adiponitrile is realized.

An ammoxidation catalyst includes a metal oxide represented by Chemical Formula 1, wherein a first peak having intensity of A appears in the 2θ range of 26.3=0.5°, and a second peak having intensity of B appears in the 2θ range of 28.3±0.5° in X ray diffraction analysis by CuKα, and an intensity ratio (A / B) of the first peak to the second peak is 1.5 or more:MoxBiaFebAcBdCeDfOy  Chemical Formula 1wherein in Chemical Formula 1,A and B are different from each other, and each independently, are one or more elements of Ni, Mn, Co, Zn, Mg, Ca, and Ba,C is one or more elements of Li, Na, K, Rb, and Cs,D is one or more elements of Cr, W, B, Al, Ca, and V,a to f, x, and y are respectively mole fractions of each atom or atomic group,a is 0.1 to 7, b is 0.1 to 7, provided that the sum of a and b is 0.1 to 7,c is 0.1 to 10, d is 0.01 to 5, e is 0.1 to 10, f is 0 to 10,x is 11 to 14, y is a value determined by each oxidation number of Mo, Bi, Fe, A, B, C, and D.

An ammoxidation catalyst includes a metal oxide represented by Chemical Formula 1 supported on a silica carrier, wherein the catalyst has pores having a diameter of 5 to 200 nm, a pore volume of 0.1 to 3.0 cm3 / g, and a BET surface area of 50 m2 / g to 1,000 m2 / g:Mo12BiaFebAcBdCeOx  Chemical Formula 1wherein in Chemical Formula 1,A is one or more elements of Ni, Mn, Co, Zn, Mg, Ca, and Ba,B is one or more elements of Li, Na, K, Rb, and Cs,C is one or more elements of Cr, W, B, Al, Ca, and V, anda to e, and x are respectively fractions of each atom or atomic group, wherein a is 0.1 to 5, b is 0.1 to 5, c is 0.1 to 10, d is 0.1 to 2, e is 0 to 10, and x is 24 to 48.

The invention discloses a catalyst for preparing acrylonitrile through propylene ammoxidation as well as a preparation method and application of the catalyst. Active components of the catalyst comprise La, Q and R, R is at least one of Ce, Pr, Nd, Sm and Eu, and Q is at least one of Zr, Ca, Ti and P; the atomic ratio of La to R is 0.05 to 0.45, and the atomic ratio of Q / (La + R) is 0.01 to 0.25. When the catalyst is used for preparing acrylonitrile through propylene ammoxidation, the catalyst has the characteristics of high activity and low two-carbon yield in a long-period operation process.

The present invention relates to the technical field of chemical apparatuses. Disclosed are a swirl nozzle, a tubular distributor, a fluidized bed reaction device and a hydrocarbon ammoxidation method. The swirl nozzle comprises: a housing, the housing defining a swirl chamber, the swirl chamber comprising an upper swirl chamber and a lower swirl chamber, a bottom end opening being formed in the bottom end of the lower swirl chamber, and the housing being provided with a nozzle feed port that leads to the upper swirl chamber; and a central column arranged inside the swirl chamber, the bottom end of the central column extending towards the bottom end opening of the lower swirl chamber, the bottom end of the central column being connected to a flow guide, and a nozzle discharge port with an annular gap being formed between the flow guide, the bottom end of the central column and the bottom end opening of the lower swirl chamber. The present invention can enhance the uniform gas distribution performance of tubular distributors, and further improve the yield of ammoxidation products.

The invention discloses a 2-methylpyridine ammoxidation fixed bed catalytic reactor and a catalytic reaction system, and belongs to the technical field of efficient catalysis. Comprising a tower body, a mixed gas inlet is formed in the top of the tower body, a mixed gas outlet is formed in the bottom of the tower body, a plurality of catalyst laminar flow pipes and a plurality of baffle plates are arranged in an inner cavity of the tower body, a plurality of arc-shaped jacketed pipes are horizontally arranged on the outer wall of the tower body in a surrounding mode, and one axial end of each arc-shaped jacketed pipe is a closed end; the other axial end of the arc-shaped jacketed pipe is a fused salt inlet, a plurality of communicating holes are formed in the connecting face of the outer wall of the tower body and the arc-shaped jacketed pipe, and a fused salt outlet is further formed in the outer wall of the tower body. Fused salt fluid is annularly and uniformly distributed at the fused salt inlet through the arc-shaped jacketed pipe, the flow field disturbance and bias flow phenomena caused by a traditional tangential inlet are avoided, the flowing stability of the fused salt fluid is improved, formation of a local flowing isolation area is eliminated, heat accumulation is reduced, the heat transfer uniformity is improved, and the catalytic efficiency is improved.

The invention provides a direct ammoxidation coupled autotrophic denitrification sewage treatment method and a bioreactor. The sewage treatment method by coupling direct ammonia oxidation with autotrophic denitrification comprises the following steps: sewage enters a continuous flow bioreactor, the bioreactor comprises a first-stage aerobic section, a second-stage anoxic section and a third-stage aerobic section which are arranged in sequence, a direct ammonia oxidation microbial agent is put into the first-stage aerobic section, and the third-stage aerobic section is put into the second-stage anoxic section; a ferrous sulfide autotrophic-heterotrophic denitrification filler is put into the second-stage anoxic section; the sewage comprises high-ammonia-nitrogen low-carbon-nitrogen-ratio wastewater; sewage staying in the third-stage aerobic section enters a secondary sedimentation tank and then is discharged. According to the method, no additional carbon source is needed, the sludge yield is low, and green, low-carbon and efficient treatment of the high-ammonia-nitrogen and low-carbon-nitrogen-ratio wastewater is realized.

The invention belongs to the technical field of diesel engine emission reduction, and particularly relates to a diesel engine nitrogen oxide reducing agent PN emission characteristic test system and test method. The diesel engine nitrogen oxide reducing agent PN emission characteristic test system comprises a combustor, a filter, a mixing pipe, an SCR catalyst and an ASC catalyst which are communicated in sequence. The combustor is used for introducing fuel and carrying out combustion reaction; the filter is used for filtering upstream particulate matters generated by combustion reaction; the mixing pipe is used for introducing a nitrogen oxide reducing agent and a simulation gas component, and is used for mixing the filtered combustion product, the nitrogen oxide reducing agent and the simulation gas component to form a mixed gas; the SCR catalyst is used for promoting a catalytic reduction reaction of the mixed gas; the ASC catalyst is used for carrying out ammoxidation reaction; and a downstream particle counter is arranged at an outlet of the ASC catalytic converter. By using the PN emission characteristic test system for the nitrogen oxide reducing agent of the diesel engine in the technical scheme, the particulate matter emission level of the nitrogen oxide reducing agent of the diesel engine can be tested.

The invention discloses an amorphous PtNi self-supporting catalytic electrode, a preparation method thereof and a direct ammonia fuel cell, and belongs to the technical field of electrode materials. According to the technical scheme, the catalytic electrode adopts foamed nickel as a conductive framework substrate, and an amorphous PtNi alloy wall-shaped array structure grows on the foamed nickel in situ; the preparation method of the catalytic electrode comprises the following steps: pretreating the foamed nickel substrate; the preparation method comprises the following steps: adding platinum diacetylacetonate, potassium hydroxide, N, N-dimethylformamide and diethylenetriamine into ethylene glycol to prepare a precursor solution; and immersing foamed nickel into the precursor solution, and carrying out in-situ growth reaction under high-temperature and high-pressure conditions to obtain the amorphous PtNi self-supporting catalytic electrode. The catalytic electrode has the beneficial effects that the catalytic electrode shows high specific activity and extremely low apparent activation energy in ammoxidation reaction, still keeps 90% of current density after continuously working for 1000 hours, and shows excellent long-term stability and durability.

The invention discloses a method for treating high-concentration ammonium fluoride wastewater in the electronic industry, which specifically comprises the following steps: firstly, carrying out induced crystallization fluorine resourceful treatment to remove fluoride in the wastewater; performing enzyme catalytic decomposition of hydrogen peroxide to remove hydrogen peroxide in the wastewater; and finally, carrying out integrated anaerobic ammonia oxidation treatment to remove ammonia nitrogen in the wastewater. According to the method disclosed by the invention, a combined process of induced crystallization fluorine recycling, enzyme catalysis hydrogen peroxide decomposition and integrated anaerobic ammonia oxidation is adopted, fluoride removal and fluorine recycling are synchronously realized through an induced crystallization process, and hydrogen peroxide is efficiently removed through an enzymatic reaction; high-efficiency treatment of high-ammonia-nitrogen wastewater is realized through a short-cut nitrification-anaerobic ammonia oxidation process under a low-energy-consumption condition, and the problems of high agent consumption, high sludge yield, high operation cost and low ammonia-nitrogen removal rate of a traditional ammonium fluoride wastewater treatment process (air stripping and chemical coagulation) are solved.

A process method for preparing acrylonitrile through propylene ammoxidation belongs to the field of chemical engineering, and is characterized in that in a corresponding device and a reaction system of the method, propylene, ammonia gas and air (in terms of O2) enter a fluidized bed reactor at 400-450 DEG C and 0.01-0.15 MPa for reaction according to a ratio of 1: (1-1.5): (2-10) at a weight hourly space velocity of 0.04-0.1 h <-1 >; the micro-sphere catalyst with the particle size of 40-60 microns in the dense-phase section and the dilute-phase section has alpha-phase bismuth molybdate, gamma-phase bismuth molybdate and lattice oxygen active centers and meets the chemical formula MoaBibNicWdTleVfPgSixOy, the atomic ratio a in the formula is 21-22, the atomic ratio b in the formula is 1.5-2, the atomic ratio c in the formula is 4-5, the atomic ratio d in the formula is 0.8-1, the atomic ratio e in the formula is 0.09-0.1, the atomic ratio f in the formula is 0.15-0.2, the atomic ratio g in the formula is 0.8-1, the atomic ratio x in the formula is 70-71, and y is the number of oxygen atoms needed by the atomic valence of all elements; a product enters a quench tower and a water absorption tower to be neutralized and cooled, and then passes through a recovery tower, an acetonitrile tower, a decyanation tower, a layering device and a finished product tower to realize separation of a water phase and an organic phase, so that crude acetonitrile, hydrocyanic acid and refined acrylonitrile are further obtained. The process is good in conversion degree and product selectivity, stable and reliable in operation, energy-saving and environment-friendly.

The invention discloses a Co monatomic modified alpha-Fe2O3 nanorod photo-anode and a preparation method and application thereof.The preparation method comprises the steps that during preparation, fluorine-doped SnO2 (FTO) conductive glass serves as a matrix, and an alpha-Fe2O3 nanorod precursor is prepared through a hydrothermal synthesis method; the preparation method comprises the following steps: taking Co (NO3) 2.6 H2O, Zn (NO3) 2.6 H2O and 2-methylimidazole as main raw materials, and preparing a Co monatomic catalyst by adopting a normal-temperature chemical method; then, the Co monatomic catalyst and the precursor alpha-Fe2O3 are rapidly sintered in ultra-high-temperature flame by using methane premixed flame. The Co monatomic catalyst is modified on the surface of the alpha-Fe2O3 nanorod, so that on one hand, the compounding of photo-induced electrons and holes is inhibited, and the charge transfer efficiency in the electrode and the charge transfer efficiency at a solid-liquid interface are improved; on the other hand, the Co SACs are used as active sites of the ammoxidation reaction, and photoelectrocatalysis ammonia decomposition is achieved.

The present invention relates to the technical field of wastewater treatment, and in particular to a detection device and method for measuring anaerobic ammonium oxidation activity. The detection device comprises a reactor and a detector; the reactor comprises a first reaction chamber and a second reaction chamber; the first reaction chamber is used for an anaerobic ammonium oxidation reaction and a denitrification reaction of sludge to be tested; the second reaction chamber is used for a denitrification reaction of said sludge; and the detector is used for controlling and recording the flow rates of chemicals entering the first reaction chamber and the second reaction chamber, ensuring that the pH values of the first reaction chamber and the second reaction chamber are constant and the same. According to the device, the real-time activity and maximum activity of anaerobic ammonium oxidation can be obtained on the basis of the hydrogen ion consumption rate in the reaction process, avoiding the cumbersome process of continuously sampling and measuring the concentration of ammonia nitrogen or nitrite in a conventional method, and simplifying the operation process; the first reaction chamber and the second reaction chamber of the detection device use the same sludge as a control, and the interference caused by the denitrification process using endogenous organic matter as an electron donor is eliminated, improving the measurement precision.

The invention discloses a method for enhancing co-metabolism degradation of antibiotics in ammoxidation sludge, and belongs to the technical field of sewage treatment. According to the method, ammonia oxidation sludge is enriched firstly, artificially synthesized sewage is used as inlet water of an ammonia oxidation sludge enrichment reactor, the reactor is operated by adjusting the pH value to be acidic, sulfamethoxazole with different concentrations in the inlet water is treated in stages, co-metabolism of the ammonia oxidation sludge is enhanced, and sulfamethoxazole degradation is enhanced under the long-term operation condition; the ammonia nitrogen removal rate is not obviously inhibited. The method provided by the invention not only can remove ammonia nitrogen in sewage, but also can efficiently and stably degrade antibiotics, and can reduce propagation and invasion of pathogens in nature, thereby protecting biodiversity and stability of an ecological system.

The invention discloses an ammoxidation catalyst and a preparation method and application thereof, the active component of the catalyst is represented by a general formula MoxBiaFebAcBdCeDfEgFhOy, A represents at least one element selected from the combination of a nickel element, a cobalt element, a manganese element, a zinc element and a cadmium element; b represents at least one element selected from the group consisting of magnesium, strontium and barium elements; c represents at least one element selected from a combination consisting of potassium, rubidium and cesium elements; d represents at least one element selected from the group consisting of a tungsten element, a vanadium element, a chromium element, a gallium element, a germanium element, a scandium element, an yttrium element, an indium element, a tin element, and an antimony element; e represents at least one element other than promethium element among lanthanide elements; f represents at least one element among platinum group elements. According to the present invention, the composition ratio of the active components of the catalyst is regulated according to the action mechanism of the metal catalyst, such that the comprehensive performance of the catalyst is improved, and the high trinitrile product yield and the low trinitrile yield material consumption are provided.

The invention discloses a system for treating leachate of a household garbage incineration plant based on direct ammoxidation, and relates to the technical field of treatment of the leachate of the household garbage incineration plant. A wastewater outlet of an anaerobic hydrolysis acidification reactor is connected to a water inlet of a first sedimentation tank, and a water outlet of the first sedimentation tank is connected to a water inlet of a direct ammoxidation reactor; a water outlet of the direct ammoxidation reactor is connected with a water inlet of the second sedimentation tank; a water outlet of the second sedimentation tank is connected with a water inlet of the heterotrophic denitrification reactor; a water outlet of the heterotrophic denitrification reactor is connected to a water inlet of the membrane bioreactor; a membrane water outlet of the membrane bioreactor is connected to a water inlet of the catalytic ozonation reactor, and effluent of the catalytic ozonation reactor flows into a water outlet barrel. The system does not need to add an expensive carbon source, so that the treatment process is simplified, the occupied area is reduced, and the construction investment and the operation cost are reduced to a certain extent.

A catalytic article for treating an exhaust gas stream comprising, in a first coating structure, a substrate, a coating comprising a first catalyst comprising a noble metal component and a second catalyst comprising a molecular sieve component; or in a second coating structure comprising-a substrate,-a first coating comprising a first catalyst comprising a noble metal component, and-a second coating covering at least a portion of the first coating and comprising a second catalyst comprising a molecular sieve component; wherein the coating layer in the first coating layer structure or the second coating layer in the second coating layer structure has intergranular pores having a porosity of 5.7% or more, respectively. The invention also relates to a method for preparing a catalytic article by depositing a coating using a pore former in a slurry, and to a system for treating an exhaust gas stream comprising the catalytic article.

This invention discloses a composite sponge carrier for anaerobic ammonia oxidation, its preparation method, and its application, belonging to the field of wastewater treatment technology. The composite sponge carrier comprises: a porous polyurethane sponge and a composite component loaded on the surface and internal pores of the porous polyurethane sponge; wherein the composite component includes chitosan-modified biochar as a microbial affinity functional component and zeolite powder as a component for ammonia nitrogen adsorption and ion exchange regulation. This invention introduces more active functional groups and hydrophilic interfaces conducive to microbial attachment through chitosan modification, and then co-impregnates and loads it with zeolite powder onto the surface and pores of the polyurethane sponge. This improves the composite sponge carrier's retention and enrichment capacity for anaerobic ammonia oxidizing bacteria, improves the local substrate environment during the start-up phase, promotes rapid biofilm establishment, and enhances the system's operational stability.

The invention relates to the technical field of catalyst preparation, in particular to a catalyst for preparing 2, 4-dichlorobenzonitrile and a preparation process of the catalyst. The prepared catalyst overcomes the problems that a traditional catalyst for synthesizing 2, 4-dichlorobenzonitrile is poor in catalytic property and poor in catalytic cycle stability. The catalyst is composed of main active metals containing vanadium / molybdenum / tungsten and the like, rare earth metals, acid and alkali metals and other active components and a molecular sieve carrier, and the conversion rate and selectivity of ammoxidation reaction are significantly improved through the synergistic effect of the multi-metal components and through the mechanisms of redox cycle, electron transfer regulation and control, acid site optimization and the like. The carrier adopts a hydrothermal synthesis process, and is subjected to pre-crystallization, crystallization, calcination, ammonium chloride exchange and other steps to form a regular pore channel structure, so that the metal-carrier interaction is enhanced, and the activity stability in recycling is guaranteed; according to the mixing process, through two-stage calcination and accurate proportion regulation and control, uniform loading of active metal is achieved, and the finally prepared catalyst is excellent in catalytic performance and high in stability.

A catalyst for preparing acrylonitrile by propylene ammoxidation, a preparation method therefor, and a use thereof. The catalyst comprises an active component and a carrier, and the active component comprises Mo, Bi, Fe, at least one rare earth element, at least one alkali metal element, and at least one alkaline earth metal element. The catalyst has a molybdate crystal plane distribution index RQ of 0.65-0.98, where RQ = (R'+Q') / (R+Q).

The present invention discloses an ammonia oxidation process and a method for recovering Rh from a gas phase comprising volatile precious metals, comprising the steps of: a) generating or providing volatile precious metals, particularly by operating a catalytic system comprising a catalyst, wherein the catalyst contains precious metals, wherein the precious metals at least comprise Rh, wherein the volatile precious metals comprise at least volatile Rh; b) contacting volatile Rh generated in step a) with a recovery system comprising a compound of formula Co3-xMxO4, where M is Fe or Al and x = 0-2; and c) forming a solid composition comprising the compound of formula Co3-xMxO4 and Rh, wherein the compound of formula Co3-xMxO4 is bonded with Rh, particularly as determined by SEM-EDS and TEM analysis. The present invention further relates to the use of the compound of formula Co3-xMxO4, where M is Fe or Al and x = 0-2, or the use of the recovery system, for recovering at least volatile Rh.

The application provides an ammonia oxidation catalyst, a preparation method and application thereof, and a method for synthesizing acrylonitrile by propylene ammonia oxidation, and the general formula of the active component of the catalyst is Mo 12 Bi a B b C c D d O x ; wherein B is selected from at least one of group VIII metal elements; C is selected from at least one of alkaline earth metal elements; D is selected from at least one of alkali metal elements; and the hollow rate of the catalyst is 0-5%. The catalyst has the advantages of good sphericity, few hollow particles, uniform particle size distribution, good fluidization state in a fluidized bed reactor, less catalyst loss after long-term operation, high acrylonitrile yield, low content of by-products two-carbon and propylene aldehyde, and better long-term operation stability.

The invention discloses a vanadium-chromium composite oxide material. The composition of the composite oxide is VCrxMyOz, wherein M is one of Ti, Mo, W, B, Fe, Co, Ni, Cu, Zn, Sb, Bi, alkali metal or alkaline earth metal; x is equal to 0.1-3 and is the atom molar ratio of chromium to vanadium; y is equal to 0-1.5 and is the atom molar ratio of M to vanadium; z is determined according to the valence state of atoms; the composite oxide material is a porous hollow microsphere formed by assembling blocky or flaky nanoparticles, and the diameter of the composite oxide material is 1-100 [mu] m. The invention also discloses a preparation method and application of the material. Vanadium and chromium compounds and compounds of other elements are used as raw materials, amino acid compounds are used as auxiliary reagents, the prepared vanadium and chromium composite oxide can be self-assembled to form a porous hollow micron spherical structure, and the microsphere material is uniform in particle size distribution and large in specific surface area; the vanadium-chromium composite oxide with the structure can be used for preparing aromatic nitrile through ammoxidation reaction of methyl aromatic hydrocarbon, the ammoxidation reaction temperature is low, the reaction activity and the product yield are high, and the selectivity is good.

The present application provides a catalyst for preparing acrylonitrile, which comprises a carrier and an active component, wherein the active component is a metal oxide having the general formula (I) A a B b C c Fe d Ni e Bi f Mo 12 O x (I). The present application also provides a method for preparing the catalyst for preparing acrylonitrile of the present application. The present application also provides the use of the catalyst for preparing acrylonitrile of the present application or the catalyst for preparing acrylonitrile prepared according to the method of the present application in the preparation of acrylonitrile by propylene ammoxidation. The catalyst for preparing acrylonitrile of the present application still has a high acrylonitrile yield under a high propylene load. The catalyst not only has a high acrylonitrile yield under a high propylene load, but also has a low acrolein yield, so that the acrylonitrile recovery rate of the device is high to improve the production efficiency and economic benefit of the device.

The application provides a method for synthesizing adiponitrile by selective ammoxidation of epoxycyclohexane. The purpose of the application is to simulate and optimize the process of synthesizing adiponitrile by one-step direct ammoxidation of epoxycyclohexane, and to develop a new type of multiphase composite metal vanadium-based oxide catalyst, which is composed of Co a V b P c Mo d MNOx / TiO2, the active elements of which include vanadium element V, cobalt element Co, phosphorus element P and molybdenum element Mo, M is an auxiliary metal element (Mn, Cr, Fe or Ni), N is an alkali metal (Na, K or Cs); the value range of a is 0.2-1.2; the value range of b is 0.8-1.5; the value range of c is 0.1-0.23; the value range of d is 0.07-0.35; x is the proportion of oxygen atoms required to meet the oxidation state of metal. The catalyst has the advantages of simple preparation, good cycle stability, high yield and the like. The yield and product purity of adiponitrile are improved, the energy consumption in the production process of adiponitrile is reduced, and a breakthrough is realized in the production technology of adiponitrile.

A burner basket assembly of an ammonia oxidation reactor, wherein the burner basket assembly comprises a burner basket inner side wall, a gas-permeable bottom plate, wherein between the burner basket inner side wall and the bottom plate a circumferential radial clearance is present, an L-shaped clearance cover profile which comprises a horizontal clearance cover plate and a vertical clearance cover plate which has a certain length, wherein the horizontal and the vertical clearance cover plate are mechanically fixed to each other, and wherein the L-shaped cover profile during operation is displaceable in a vertical direction in view of the burner basket inner side wall, a support ring which is mechanically fixed to the burner basket inner side wall, an upside-down positioned L-shaped locking profile, comprising a horizontal locking plate and a vertical locking plate which are mechanically fixed to each other, wherein the horizontal locking plate is mechanically fixed to the support ring, wherein the L-shaped locking profile, the support ring and the respective part of the burner basket inner side wall limit a ring-shaped gap into which at least a top part of the vertical clearance cover plate is located, and wherein between the support ring and the vertical clearance cover plate a distance is arranged which is such that the vertical displacement of the vertical clearance cover plate in view of the burner basket inner side wall is limited by the support ring and at all times during the operation of the burner basket, collision between the L-shaped clearance cover profile and the L-shaped locking profile is avoided.

The invention discloses an ammoxidation furnace platinum net bracket device which comprises a rotating seat, the rotating seat is coaxially fixed on an output shaft of a main motor of an ammoxidation furnace, a conical platinum net rack is rotatably arranged on the rotating seat, the platinum net rack is arranged in the radial direction of a furnace body of the ammoxidation furnace, and a connecting ring is arranged at the front end of the platinum net rack. The connecting ring is rotationally arranged on the rotating seat, a base matched with the inner wall of a furnace body of the ammoxidation furnace is arranged at the rear end of the platinum net rack, the rear end of the platinum net rack is rotationally arranged on the base, the platinum net rack is made of platinum rhodium alloy wires, a plurality of platinum net racks are arranged on the circumference of the rotating seat at equal intervals, and a driving assembly is arranged on the base. The driving assembly is used for driving the platinum net frame to rotate, a shaping frame is arranged between the rotating seat and the base, one end of the shaping frame is fixed to the rotating seat, the other end of the shaping frame is fixed to the base, and the shaping frame is arranged in the generatrix direction of the platinum net frame. The problem that a lower-layer platinum net in a middle-layer structure in the prior art is not fully utilized is solved.

The invention relates to the field of catalysts, in particular to an ammoxidation catalyst, a preparation method and application thereof and a preparation method of acrylonitrile. The catalyst comprises a carrier and an active component, the active component comprises a composite oxide of molybdenum, bismuth and iron, and the carrier contains an inert oxide and an MFI molecular sieve. Through research, the inventor finds that by optimizing the components of the catalyst and adding the MFI molecular sieve into the carrier, the adsorption and migration speed of raw material molecules on the surface of the catalyst can be increased, and the adsorption activation rate is increased, so that the catalytic performance and stability of the catalyst under a high-load condition are improved.

The invention discloses a preparation method of a superfine PtIr nanowire catalyst for ammoxidation. The preparation method comprises the following steps: firstly, fully dissolving platinum acetylacetonate, iridium acetylacetonate, tungsten hexacarbonyl and dodecyl trimethyl ammonium bromide in oleylamine to obtain a light yellow solution; carrying out ultrasonic treatment on the obtained light yellow solution until the solution is fully dissolved; and heating the obtained uniform light yellow solution to 190 DEG C in an oil bath, keeping the temperature for 5 hours, centrifuging, washing and drying to obtain the superfine PtIr nanowire catalyst. The nanowire structure has a high specific surface area and abundant active sites, and is beneficial to effective quality and electron transmission. Through alloying of Ir and Pt, the electronic structure on the surface of the catalyst is changed, and the poisoning probability is effectively reduced. Meanwhile, the adsorption and activation process of ammonia molecules is optimized through the synergistic effect between Pt and Ir, the reaction activation energy is reduced, and the reaction rate is remarkably increased. The catalyst not only has remarkable ammonia oxidation catalytic performance, but also is good in stability and simple in preparation process.

The invention discloses a CsPb2Br5 / Na2Ti3O7 nanotube composite catalyst, the CsPb2Br5 / Na2Ti3O7 nanotube composite catalyst is formed by compounding CsPb2Br5 and a Na2Ti3O7 nanotube, and the mass ratio of the CsPb2Br5 is 5-25%. The invention also discloses a preparation method of the catalyst, and the catalyst is successfully applied to selective photocatalytic ammoxidation of methyl aromatic hydrocarbon to prepare arylformonitrile. When the composite catalyst is used for selective photocatalytic ammoxidation of methyl aromatic hydrocarbon, high benzonitrile yield (greater than 0.93 g.gcat <-1 >. Day <-1 >) and high selectivity (80%) can be obtained under mild conditions (the lowest reaction temperature is 100 DEG C and the lowest reaction pressure is 1 bar), and the composite catalyst is a satisfactory photocatalyst.