22results about How to "Improve catalytic oxidation performance" patented technology

The invention relates to the technical field of indoor environment catalytic purification, and discloses a room-temperature formaldehyde removal catalyst as well as a preparation method and application thereof. The room-temperature formaldehyde removal catalyst comprises a carbon-series material and a perylene derivative loaded on the carbon-series material; the mass ratio of the perylene derivative to the carbon-series material is (5: 1)-(1: 50). The catalyst disclosed by the invention has an excellent catalytic oxidation effect on formaldehyde, can effectively oxidize and remove formaldehyde at room temperature, does not have the problems of limited adsorption capacity, adsorption saturation and the like compared with a traditional formaldehyde removal material depending on an adsorption effect, is high in removal efficiency and long in service life, and can realize long-time formaldehyde removal.

The present invention discloses a sub-nanometer-thick porous cobalt oxide thin sheet with a specific crystal face exposed, a preparation method and an application thereof. A cobalt source is added to an alcohol solution, stirred evenly, and then subjected to a hydrothermal reaction at 190-220°C for 48-96h to obtain an ultra-thin CoO sheet with a (111) crystal face exposed; the ultra-thin CoO sheet with the (111) crystal face exposed is heated. 2 COO ‑ The hydrogen bonds and van der Waals interactions between the species will generate directional short-range attraction between the CoO cores. Driven by the directional short-range attraction and electrostatic interaction, the CoO cores self-assemble into sub-nanometer thick two-dimensional CoO nanosheets with exposed (111) crystal planes. The sub-nanometer thick porous cobalt oxide thin sheets prepared by the present invention have a large number of low-coordinated Co atoms, defect sites and a large reaction area, thereby improving its low-temperature catalytic oxidation activity.

The invention belongs to the technical field of harmless treatment of hazardous solid waste resources, and discloses a supported VOCs treatment catalyst, which is prepared by the following steps: by taking waste catalyst powder and gamma-Al2O3 as raw materials, carrying out dry mixing to obtain a mixed material, then mixing the mixed material with an adhesive and a pore-enlarging agent to obtain base material powder, then carrying out dry molding to obtain a molded catalyst carrier, and finally, carrying out solid-liquid separation on the molded catalyst carrier to obtain the supported VOCs treatment catalyst. And preparing a mixed impregnation liquid of ferric nitrate and manganous nitrate, and preparing the supported VOCs treatment catalyst by adopting a complete equivalent-volume impregnation method. A series of forming auxiliaries are added, the forming process is optimized, and sheet carrier forming is achieved; and loading an iron element which is low in price and easy to obtain on the formed carrier through a two-dipping and two-baking method, and taking a manganese element as a second metal to prepare the environment-friendly bimetallic oxide catalyst for VOCs waste gas treatment, so that resource utilization of wastes is realized. The catalyst has a good VOCs catalytic oxidation effect, the ethylbenzene conversion rate can reach 99.5% or above, and waste gas treatment is achieved.

The tritium and carbon sampling system comprises a catalytic oxidation heating device, and a gas inlet device, an absorption device and a gas extraction device which are communicated in sequence. The absorption device comprises a front-section absorption bottle and a rear-section absorption bottle communicated with the front-section absorption bottle, the front-section absorption bottle is communicated with the air inlet device, and the rear-section absorption bottle is communicated with the air extractor. The catalytic oxidation heating device is provided with a gas inlet and a gas outlet communicated with the gas inlet, the gas inlet is communicated with the front-section absorption bottle, and the gas outlet is communicated with the rear-section absorption bottle. The first temperature sensor is arranged on the gas outlet side of the catalytic oxidation heating device and used for collecting the temperature of gas on the gas outlet side of the catalytic oxidation heating device, and the control device is electrically connected with the catalytic oxidation heating device and the first temperature sensor. The heating temperature of the catalytic oxidation heating device is adjusted through the first temperature sensor and the control device, so that the heating temperature of the catalytic oxidation heating device can be accurately controlled.

The invention discloses a method for regulating spinel type high-entropy oxide by using an electrostatic spinning method. The preparation method is characterized by comprising the following steps: fully mixing metal sources with different concentrations, polyacrylonitrile and N, N-dimethylformamide to form a precursor solution, and then preparing the spinel type high-entropy oxide with a nanofiber structure through an electrostatic spinning method. The result shows that compared with a traditional high-entropy oxide preparation method, the electrostatic spinning method is beneficial to lowering the phase change temperature, and formation of the nanoscale high-entropy oxide is promoted. And the formed fiber is greatly influenced by the precursor solution, the final fiber state of the catalyst can be effectively regulated and controlled by changing the amount of the added total metal substance, and great difference is shown in the catalytic oxidation activity of ethyl acetate. The preparation process is simple, and the application value of the high-entropy oxide in the field of heterogeneous catalysis is improved.

The invention relates to a hydrogen peroxide production wastewater pretreatment method, and belongs to the technical field of wastewater treatment. The graphene oxide is used as a substrate material, some oxygen-containing functional groups such as hydroxyl, epoxy group and carboxyl are connected to the two-dimensional base plane of the graphene oxide, and the hydrophilicity is good. Carboxyl on graphene oxide and soluble ferric salt are subjected to a complex reaction under the high-temperature condition, the ferric salt covers the surface of the graphene oxide, graphene-loaded nano ferroferric oxide particles are synthesized, the agglomeration effect of nano ferroferric oxide can be reduced, the catalytic effect of nano ferroferric oxide is improved, the dosage of a catalyst is reduced, and the cost is reduced. In addition, a sulfonic acid-based ionic liquid is added in the process of synthesizing graphene nano ferroferric oxide, sulfonic acid groups are introduced into interlayers and the surface of graphene, and the introduction of the sulfonic acid groups increases the number of acidic active centers on the surface of the graphene, so that the catalytic activity, the selectivity and the reaction rate of the nano ferroferric oxide are improved; the catalytic oxidation effect is improved, and the wastewater treatment efficiency is improved.

The invention discloses a rare earth calcination tail gas treatment device, and relates to the field of tail gas treatment. The rare earth calcination tail gas treatment device comprises a treatment box, a gas inlet formed in the top of the treatment box and a gas outlet formed in the bottom of the treatment box, a mounting plate is fixedly connected to the inner wall of the treatment box, and a filtering mechanism for filtering pretreated rare earth calcination tail gas is arranged on the upper surface of the mounting plate; a plurality of first partition plates are fixedly connected to the position, below the mounting plate, of the inner wall of the treatment box, a cylinder is fixedly connected to the middles of the multiple first partition plates, and a plurality of second partition plates are fixedly connected to the inner wall of the cylinder; rare earth calcination tail gas can be continuously filtered, so that the tail gas treatment efficiency is improved; the contact area of the catalyst and tail gas can be increased, the catalytic oxidation effect is improved, organic gas is removed and converted into harmless substances such as carbon dioxide and water, and the tail gas treatment quality is also improved.

The invention belongs to the technical field of fuel cells, and particularly relates to a multi-metal series catalyst and a preparation method and application thereof. The multi-metal series catalyst is composed of two structures, wherein one structure is a transition bimetal-based hydrotalcite material and is of a sheet structure; and the other one is noble metal nanoparticles uniformly dispersed on the carbon material, and the average size is less than 10 nanometers. The prepared series catalyst is applied to sodium borohydride electrooxidation reaction, the bimetal-based hydrotalcite material is used as an active site for borohydride adsorption and preliminary oxidation, and the noble metal nanoparticles are used as an active site for further oxidation of a preliminary oxidation product of borohydride. As the anode catalyst of the direct fuel cell, the anode catalyst not only has high electron transfer number, but also shows relatively high power density. Compared with other common catalysts, the use amount of precious metal is low, the preparation method is simple and controllable, and high application value is shown in the field of direct hydroboron fuel cells.

This invention provides a supported noble metal catalyst, its preparation method, and its application, belonging to the field of industrial flue gas catalytic purification technology. The supported noble metal catalyst provided by this invention includes a cordierite support and a platinum catalyst bonded to the surface and pores of the cordierite support by a binder. The platinum catalyst includes a support and an active component and an active agent supported on the surface of the support. The active component is elemental Pt and Pt oxides; the active agent is one or more of tungsten oxide, molybdenum oxide, and vanadium oxide. The supported noble metal catalyst provided by this invention exhibits excellent sulfur and water resistance, is not easily deactivated, and has high catalytic efficiency.

The invention discloses a nano-diamond / graphene composite material loaded platinum-ruthenium bimetallic catalyst as well as preparation and application thereof, and belongs to the technical field of CO oxidation catalysts. According to the catalyst, a nano diamond / graphene composite material of a core-shell structure serves as a carrier, precious metal Pt serves as an active component, Ru serves as an auxiliary, a metal salt solution containing platinum and ruthenium serves as a precursor, Pt-Ru is bonded with carbon atoms with graphene defects on the surface of the carrier in a diatom pair mode through a co-impregnation method, and the catalyst is obtained. And loading to the surface of the composite material. The method provided by the invention is high in raw material utilization rate, relatively low in cost, simple in preparation process and easy to popularize and apply, and the prepared catalyst shows excellent catalytic performance in CO oxidation reaction, can realize high CO conversion rate at low temperature and can keep stable performance for a long time.

The utility model discloses a coupling air floatation-ozone catalysis rotary washing sewage treatment device which comprises a treatment box capable of rotating by 360 degrees, a catalysis box is fixedly arranged in the treatment box, a cavity is formed between the treatment box and the catalysis box, a net body is arranged in the catalysis box, a catalyst is filled in the net body, and the treatment box and the catalysis box are fixedly arranged in the cavity. One rotating end of the treatment box is connected with a rotating joint, the outer end of the treatment box is connected with a sewage pump and an air dissolving device, ozone and / or air can be introduced into the air dissolving device for aeration, the inner end of the treatment box is connected with an aeration device and a water outlet pipe, water outlets of the aeration device and the water outlet pipe are positioned in the catalysis box, and the catalysis box is provided with a water outlet. According to the utility model, nano bubbles can be generated through 360-degree rotation and gas dissolving type ozone, so that the overflow rate of ozone in sewage is reduced, and the oxidation effect is enhanced.

The invention discloses a double oxidation-electrochemical oxidation combined process for treating garbage penetrating fluid, which comprises the following steps: pretreating the garbage penetrating fluid to obtain the pretreated garbage penetrating fluid; carrying out double oxidation treatment on the pretreated garbage penetrating fluid, and filtering to obtain treated fluid A; adding a porous spherical activated carbon adsorbent into the treating fluid A, uniformly mixing, standing, and carrying out air stripping treatment and filtration to obtain treating fluid B; and carrying out electrochemical oxidation on the treatment liquid B, standing, filtering and discharging. The garbage leachate treatment device is used for solving the technical problem that the garbage leachate treatment effect is poor.

The present invention discloses a preparation method and application of a phosphorus-modified perovskite oxide-loaded noble metal catalyst, and belongs to the technical field of organic waste gas treatment. The present invention provides noble metal-specific anchoring sites through phosphorus-modified perovskite oxides, promotes the dispersion of noble metal nanoparticles, and stabilizes the noble metal nanoparticles. In addition, the electron-rich characteristics of the outer layer of phosphorus are utilized to reduce the electron density of the noble metal, thereby enhancing its ability to activate molecular oxygen at low temperatures. Ultimately, the catalytic activity and stability of the loaded noble metal catalyst are significantly improved, and the method is suitable for phosphorus-modified different perovskite oxides to load different noble metal catalysts. The processing method is simple, and the catalytic combustion performance of the catalyst for VOCs (especially toluene) is significantly improved, and the performance is stable. Moreover, during the entire reaction process of the present invention, no toxic or harmful substances are used or produced, which fully meets the requirements of clean production.

The present invention provides a 3D nano-flower-shaped MnO2-based catalyst and its preparation method and application, which relates to the field of air pollution control. A preparation method of a 3D nano-flower-shaped MnO2-based catalyst comprises: mixing a reducing agent, an oxidizing agent and a morphology directing agent, then heating to react, and then sequentially cooling, filtering, washing and drying, and then calcining to obtain a reducing agent; the reducing agent comprises Mn 2+ Compounds and / or Ce 3+ Compound. The 3D nanoflower-like MnO2-based catalyst is prepared according to the preparation method; the catalyst has a 3D flower-like structure in the form of staggered nanosheets; the 3D nanoflower-like MnO2-based catalyst is used for catalytic oxidation of ethane. The present invention uses a simple hydrothermal method to prepare a 3D flower-like MnO2-based catalyst, and the catalyst is used for catalytic oxidation of ethane. The synthesis process is simple, the raw material source is abundant and cheap, and it is easy to mass produce. The obtained catalyst has high activity and strong stability, and is especially used for catalytic oxidation of ethane, and a conversion rate of 90% can be achieved at 310°C.

The present invention relates to a carbon-nitrogen doped cerium dioxide / tourmaline ozone oxidation catalyst and its preparation method and application. The catalyst raw materials include iron tourmaline powder, lees and cerium nitrate, wherein the mass percentage of the iron tourmaline powder is 50% to 80%. The catalyst has good catalytic activity, stability and recovery performance through carbon-nitrogen doping and the interaction between cerium dioxide and tourmaline, and is conducive to wide promotion in the field of water treatment.

The invention relates to the technical field of organic synthesis, in particular to a chromium compound, a preparation method and application thereof and a benzyl alcohol compound catalytic oxidation method. The compound has a structure as shown in a formula (1): # imgabs0 #, in the formula (1), Ar is # imgabs1 # * and represents a connection site of Ar and Si; r1, R2 and R3 are independently selected from cyano, alkyl, halogen or hydrogen, and are not all hydrogen. The chromium compound disclosed by the invention has a good catalytic oxidation effect when being applied to catalytic oxidation reaction, such as catalytic oxidation of benzyl alcohol compounds.

The invention relates to the technical field of functional materials for soil remediation engineering, in particular to a solid-waste-based metal-organic framework derived porous carbon nanomaterial and a preparation method and application thereof. The invention provides a preparation method of a solid-waste-based metal-organic framework derived porous carbon nano material, which comprises the following steps: mixing a main body material of solid-waste-based binding material powder containing aluminum ions and iron ions with an organic ligand material of micro-plastic to obtain Al / Fe-MOF atash, and further carrying out nitrogen-sulfur hybridization and graphitization treatment to obtain the solid-waste-based metal-organic framework derived porous carbon nano material. The obtained solid waste-based metal-organic framework derived porous carbon nano material has a relatively strong oxidation effect and excellent dispersity. According to the preparation method, the use of the solid waste-based cementing material can be realized to the greatest extent, the preparation cost is low, the preparation process is simple, large instruments and equipment do not need to be used, and industrial application is facilitated.

This invention relates to the field of catalyst preparation, disclosing a catalyst for the removal of volatile organic compounds (VOCs), its preparation method, and its applications. The catalyst comprises a support and an active component supported on the support; wherein the active component comprises a noble metal and a matrix metal oxide, wherein the noble metal is Pt metal and / or Ag-Pt alloy; the matrix metal oxide comprises single and / or composite oxides of Al and Ce, rare earth element oxides other than cerium, and zinc oxide. The catalyst provided by this invention has high efficiency in catalytic oxidation of VOCs and is expected to be widely applied in the preparation of various fixed-bed catalytic materials, showing broad application prospects.

The present invention relates to the field of catalysts, and specifically provides a three-way catalyst for a lean-burn natural gas engine, a preparation method and an application. The three-way catalyst comprises a substrate, a first catalyst coating material and a second catalyst coating material; the first catalyst coating material comprises a first carrier material and a first active component, the first carrier material comprises one or more of CeO2-ZrO2-La2O3-Nd2O3, La2O3-Al2O3, and CeO2-Al2O3, and the first active component comprises Pd; the second catalyst coating material comprises a second carrier material and a second active component, the second carrier material comprises CeO2, CeO2-ZrO2-La2O3-Y2O3, CeO2-ZrO2-La2O3-Pr6O 11 The second active component comprises Pt and / or Ni. The catalyst has high catalytic performance in rich combustion and lean combustion modes.

The present application belongs to the field of non-point source pollution treatment, and provides a method for treating non-point source pollution by using river slope. The method comprises the following steps: setting at least two guide plates at the river slope where non-point source pollution wastewater flows into the river, the upper end and the lower end of the guide plate being connected with the top and the bottom of the slope respectively, and forming a non-point source pollution treatment area between the guide plates; digging a plurality of discrete filler pits on the slope surface of the non-point source pollution treatment area, fixing filler bags containing carbon-based functional materials or environmental functional materials in the filler pits, and making the filler bags protrude from the slope surface; introducing non-point source pollution wastewater into the non-point source pollution treatment area or adding an oxidizing agent while introducing the wastewater, and the wastewater contacts with the materials in the filler bags during flowing through the non-point source pollution treatment area to realize adsorption or adsorption and degradation of pollutants. The present application provides an effective way for treating non-point source pollution, and can reduce the threat of non-point source pollution to the ecological environment of rivers.

The embodiment of the invention relates to the technical field of waste gas purification, and particularly discloses an acrylic acid waste gas treatment device, which comprises a water removal unit, a waste gas liquid separation tank and a waste gas liquid separation unit, an input port of the jacket cooling element is respectively communicated with an exhaust port of the acrylic acid production device and an external cooling water supply device, and an output port of the jacket cooling element is communicated with an input port of the waste gas liquid separation tank; the heating unit comprises a first heat exchanger, a second heat exchanger and an electric heater; an input port of the catalytic reactor is communicated with an output port of the electric heater; the waste heat utilization unit is communicated with an output port of the catalytic reactor; and the chimney is communicated with the output port of the waste heat utilization unit. According to the application, the catalytic oxidation reaction efficiency of the acrylic acid waste gas in the catalytic reactor is improved, the waste gas treatment effect of the acrylic acid waste gas treatment device is improved, and the service life is prolonged.

The invention discloses a preparation method and application of a NiFe-LDH / CeO2 composite nanomaterial, and belongs to the field of electrochemical sensors. The NiFe-LDH-coated CeO2 nanowire composite nanomaterial is prepared, the NiFe-LDH / CeO2 composite nanomaterial is coated on the surfaces of a glassy carbon electrode and a screen-printed electrode, and electron transfer of a reaction of catalyzing and oxidizing glucose by the electrode can be effectively improved, so that the sensitivity of the electrode material to glucose detection is improved.