40results about How to "Excellent oxygen storage and release performance" patented technology

The invention discloses a supported silver catalyst for reducing soot particle burning temperature and a preparation method, relating to catalysts. The catalyst comprises an active component and a carrier, wherein the active component is silver; the carrier is cerium dioxide or cerium-based composite oxide; the supported amount of silver is 1-20% of the weight of the carrier; and the cerium-based composite oxide has the general formula of Ce1-xMxOy, and M is rare-earth metal. The carrier is prepared by adding a surfactant as a template into a cerium-based solution through a hydrothermal precipitation method. The catalyst is prepared by introducing a complexing auxiliary agent into a water-based silver nitrate solution, evaporating to dryness and baking. The prepared catalyst has excellent oxidative activity in the process of soot burning, is capable of reducing the temperature of soot T50 from 642 DEG C to about 400 DEG C to reach the operating temperature range of a diesel engine, and reaches and exceeds various types of reported soot particle burning catalysts under the same evaluation conditions.

The invention discloses preparation of a cobalt-load cerium manganese oxide catalyst. Cerium manganese oxide is prepared through an oxidization reduction method, then cobalt is loaded to the cerium manganese oxide through an equivalent-volume impregnation method, manganese oxide has good oxidization performance, cerium oxide has excellent oxygen storage and release capacity, cobalt oxide also has certain oxidization performance, the catalyst has good purifying efficiency on low-concentration nitric oxide, the conversation rate can be 96% at the temperature of 25 DEG C, long service life can also be kept, meanwhile raw materials for preparing the catalyst are easy to obtain, the technology is simple, cost is low, and industrial production can be achieved easily.

The invention discloses a cerium zirconium aluminum composite oxide oxygen storage material and a preparation method thereof. According to the cerium zirconium aluminum composite oxide oxygen storage material, the particle size is 5 to 10 nm; the BET specific surface area is 200 to 240 m<2> / g; the pore volume is 0.50 to 0.70 cm<3> / g; the average pore size is 5 to 10 nm; a cerium zirconium solid solution has a stable cubic fluorite structure. The cerium zirconium aluminum composite oxide oxygen storage material provided by the invention has the characteristics of stable structure, large specific surface area, excellent oxygen storage performance and excellent anti-ageing performance. The preparation method provided by the invention has the advantages of easily accessible raw materials and low production cost, and is suitable for industrialized amplification production.

The invention provides a novel ceramic membrane tube with a catalytic function and a preparation method of the novel ceramic membrane tube. The novel ceramic membrane tube comprises a support with one end open, a separation membrane coating the surface of the support, catalytic cotton filled in an inner cavity of the support and a honeycomb ceramic baffle which seals an opening of the support to be used for blocking and pressing the catalytic cotton. The novel ceramic membrane tube and the preparation method have the advantages that the method is novel and simple to implement, the original structure and the filtering function of the membrane tube are maintained, the catalyst function of the membrane tube is realized, the contact area of the catalytic active component and to-be-filtered gas is increased, the catalytic purification effect is improved, the catalytic component can be replaced or retreated after the ceramic membrane tube is used for a period of time due to the fact that the catalyst and the membrane tube can be separated, the service life of the membrane tube is prolonged, and the use cost is reduced.

The invention relates to a mesoporous Co / CeO2 catalyst for a hydrogen preparation reaction by reforming an ethanol vapor and a preparation method thereof. The size of the particle diameter of a mesoporous CeO2 carrier is 12nm or so; the specific surface area of the mesoporous CeO2 carrier can reach up 177m<2> / g; the pore structures of the mesoporous CeO2 carrier are sequentially arranged in a short range; the bore diameters of the mesoporous CeO2 carrier are mainly distributed within 3nm or so; cobalt (Co) taken as an active component is carried on the mesoporous CeO2 carrier; the carrying quantity of CoO2 is 5% to 20% of the mass of the catalyst. The mesoporous CeO2 prepared by using a hard template method has the large specific surface area, the short-range and sequential pore structures and the uniformly distributed bore diameters. The mesoporous CeO2 prepared from mesoporous carbon CMK-3 is mainly used for exposing a high-energy crystal face (110) and has a better oxygen storing / releasing capacity.

The invention discloses a three-way catalyst for purifying and treating lean-burn engine tail gas and a preparation method thereof. The catalyst comprises the oxides of zirconium, cerium and copper. The mol ratio of the three oxides is 0-20:0-2.5:1, wherein, the sum of the mole numbers of the oxides of the cerium and the zirconium is more than 80% of the mole number of the oxide of the copper. Water soluble zircon salt, cerium salt, copper salt and lanthanum salt form water solution composition. After citric acid is added and hartshorn is dropwise added, the solid is parched and roasted, and the catalyst is gained. The catalyst obviously reduces the conversion temperature of NO, HC and CO and has a three-way catalytic and purifying effect. The catalyst can completely desorb the CO in simulated lean-burn engine tail gas at a temperature above 200 DEG C and completely desorb NO, HC and CO at a temperature below 300-350 DEG C, can be used in an exhaust system of a lean-burn engine to eliminate the environmental pollutions of NO, HC and CO.

The invention discloses a rare-earth-base denitrification catalyst powder and a preparation method thereof. The preparation method comprises the following steps: respectively preparing a metatitanic acid slurry, an ammonium paratungstate solution and a cerous nitrate-lanthanum nitrate mixed solution; transferring the ammonium paratungstate solution into the metatitanic acid slurry to obtain an intermediate mixed solution; transferring the cerous nitrate-lanthanum nitrate mixed solution into the intermediate mixed solution to obtain a metatitanic acid-ammonium paratungstate-cerous nitrate-lanthanum nitrate mixed slurry; regulating the pH value of the solution to the set range to obtain a mixed solution containing titanium, tungsten, cerium and lanthanum; drying; calcining; and grinding to obtain the catalyst powder. The invention aims to provide a rare-earth-base denitrification catalyst powder and a preparation method thereof. The rare-earth-base denitrification catalyst powder is nontoxic and harmless to the human and environment, and has the advantages of high-temperature aging resistance, long service life, wide temperature range and controllable product composition; and the preparation method has the advantages of simple facility request and simple operational process, and can easily implement large-scale industrial production.

The invention provides a molecular sieve-based Ce-Mn oxide porous photocatalyst, and a preparation method and an application thereof, and relates to the technical field of nanomaterial photocatalysis.The porous photocatalyst contains a large amount of meso-pores, and the active components of the porous photocatalyst composed of cerium oxide and manganese oxide, wherein the manganese oxide existsin an amorphous state, the cerium oxide exists in a crystalline state, and cerium atoms in the cerium oxide are partially substituted by manganese atoms. The preparation method comprises the followingsteps: certain amounts of cerium acetate, manganese acetate and a molecular sieve are weighed, and are added into deionized water, heating and stirring are carried out until the added substances arecompletely dissolved, the obtained solution is stirred and reacted, and then is ultrasonically treated, solid particles in the solution are separated from the solution, and the obtained solid is driedat a low temperature, and then is calcined at a high temperature to prepare the molecular sieve-based Ce-Mn oxide porous photocatalyst. The molecular sieve-based Ce-Mn oxide photocatalyst of the invention has the advantages of increase of photocatalytic active sites, expansion of the visible light response range, inhibition of the regeneration of photogenerated charges, and improved visible lightphotocatalytic activity.

The embodiments of the invention disclose rare earth composite modified aluminum oxide and a preparation method and an application thereof. The preparation method includes the following steps: (a) co-currently adding a sodium aluminate solution and a rear earth nitrate solution into a dispersing agent solution to obtain a mixed solution; (b) carrying out precipitation treatment on the mixed solution under ultrasonic treatment, and then carrying out aging treatment and filtration to obtain a precipitate; and (c) washing, drying and calcining the precipitate to obtain the rare earth composite modified aluminum oxide material. The preparation method of the invention can uniformly dope rare earth elements into the aluminum oxide and make the prepared rare earth composite modified aluminum oxide have excellent thermal stability, specific surface area and pore volume. In addition, the preparation method of the invention has the advantages of simple process and easy operation.

The invention discloses a zirconium-doped cerium-manganese oxide catalyst as well as preparation and application. The catalyst is a xZr-Ce-Mn ternary complex oxide obtained by a co-precipitation method, wherein x represents the percentage of zirconium in the total mole number of cerium-manganese, and is greater than or equal to 2.5 and less than or equal to 10. A preparation method comprises the following specific steps: dissolving a certain amount of manganese salt, cerium salt and zirconium salt into 200 ml of deionized water, dripping an ammonium carbonate aqueous solution with stirring at room temperature, continuously stirring for 1 to 3 hours, then filtering to obtain solids, transferring the solids into an oven for drying at 60 to 80 DEG C for 12 hours, and then roasting the solids in a muffle at 400 to 600 DEG C for 3 to 5 hours to obtain the zirconium-doped cerium-manganese oxide catalyst, wherein the mole ratio of cerium to manganese is 1 to 1. The catalyst is used for catalytic oxidation of nitric oxide, and the highest conversion ratio can reach 99 percent or above at 150 DEG C. Furthermore, the industrialized production of the zirconium-doped cerium-manganese oxide catalyst is easy to realize as the raw materials for preparing the catalyst are easily obtained, the process is simple and the cost is relatively low.

The present invention discloses an automobile exhaust gas purifying catalyst preparation method, a noble metal, cerium and zirconium are prepared into a noble-metal-containing cerium-zirconium solid solution by a co-precipitation method, the method is simple in process and easy to control, and the noble-metal-containing cerium-zirconium solid solution obtained by the method has more micropores, high specific surface area and good oxygen storage and release capacity.

The invention discloses a preparation method of a cerium-zirconium-based oxide solid solution with high specific surface area. The preparation method comprises the following steps: (1) adding ammonium bicarbonate aqueous solution to a mixed solution of cerium salt, zirconium salt and a salt of other rare earth element except cerium to adjust the pH value of the mixed solution to 4.5-5.0, so as toobtain a mixed precipitation solution; (2) adding the mixed precipitation solution to a basic solution for precipitating, so as to obtain a mixed solution containing a precipitate, wherein the use amount of the basic solution can maintain the pH value of the precipitated mixed solution to 10-11; (3) aging the mixed solution containing the precipitate, collecting the precipitate, washing, then adding a dispersing agent, and pulping; and (4) baking the obtained slurry at 500-800 DEG C for 3-6 hours to obtain the cerium-zirconium-based oxide solid solution. The obtained cerium-zirconium-based oxide solid solution has high specific surface area, excellent oxygen storage and release performances, and can be applied to a cocatalyst or a catalyst carrier of a three-effect catalyst for automobileexhaust.

A preparation method for catalytically active ceramic cotton for flue gas denitration is provided; a preparation process comprises the following steps successively: (1) preparing a mixed solution containing a catalytically active ingredient; (2) dipping zirconia ceramic cellucotton in the mixed solution prepared in the step (1); (3) removing excess solution of the cellucotton dipped in the solution in the step (2), and fumigating with ammonia gas; (4) carrying out drying treatment on the cellucotton fumigated in the step (3); and (5) calcining. The prepared catalyst product has the advantages of large specific surface area, high temperature resistance, corrosion resistance and wide use range.

The invention discloses a preparation method of an organic volatile gas adsorption material for wood drying. The organic volatile gas adsorption material is prepared by activated carbon particles, lavender, fly ash, chromium nitrate, cerium nitrate, aluminum oxide powder and the like. The preparation method has the advantages that by subjecting activated carbon to acidification modification, a developed pore structure and large specific surface are provided, and adsorption capacity is increased; the fly ash processed by acid and alkali is used as the matrix to load Cr-Ce composite oxysome, a degradation space is provided for organic pollution, and organic matter adsorption and degradation varieties are increased greatly; meanwhile, lavender essential oil extract is used to increase aroma in the air during wood drying waste gas processing so as to optimize a working air environment; the preparation method is simple in process, low in cost, safe and stable in product, promising in marketprospect and good in application value.

The invention discloses a cerium-based catalyst for benzene low-temperature catalytic removal, and preparation and application thereof. The catalyst is characterized in that cobalt doping cerium oxide is used as active ingredients, wherein the mol ratio of cobalt to cerium is (1:9) to (3:7); the catalyst is prepared by a citric acid sodium hydroxide method; the preparation method is simple; and the particles of the catalyst are uniform. Composite oxides formed by non-noble metal cobalt and cerium are used as active ingredients of the catalyst, so that the cost of the catalyst is greatly reduced; in addition, the catalyst provided by the invention has good catalytic oxidation activity at high air speed and low reaction temperature. The cobalt doping is used for modifying the cerium-based catalyst, so that the high-temperature catalytic oxidation activity on benzene series compounds is greatly improved; and the foundation is laid for the development of the cerium-based catalyst.

The invention relates to a mesoporous Co / CeO2 catalyst for a hydrogen preparation reaction by reforming an ethanol vapor and a preparation method thereof. The size of the particle diameter of a mesoporous CeO2 carrier is 12nm or so; the specific surface area of the mesoporous CeO2 carrier can reach up 177m<2> / g; the pore structures of the mesoporous CeO2 carrier are sequentially arranged in a short range; the bore diameters of the mesoporous CeO2 carrier are mainly distributed within 3nm or so; cobalt (Co) taken as an active component is carried on the mesoporous CeO2 carrier; the carrying quantity of CoO2 is 5% to 20% of the mass of the catalyst. The mesoporous CeO2 prepared by using a hard template method has the large specific surface area, the short-range and sequential pore structures and the uniformly distributed bore diameters. The mesoporous CeO2 prepared from mesoporous carbon CMK-3 is mainly used for exposing a high-energy crystal face (110) and has a better oxygen storing / releasing capacity.

The invention discloses the preparation of a cobalt-loaded cerium-manganese oxide catalyst. The cerium-manganese oxide is prepared by an oxidation-reduction method, and then cobalt is loaded on the cerium-manganese oxide by an equal-volume impregnation method. The manganese oxide has good oxidation performance. Cerium oxide has excellent oxygen storage and release capacity, and cobalt oxide also has certain oxidation performance. The catalyst has good purification efficiency for low-concentration nitric oxide, and the conversion rate can reach 96% at 25°C, and it can also maintain a long The life of the catalyst is easy to obtain, the process is simple, the cost is low, and the catalyst is easy to realize industrial production.

The invention provides a cerium-tungsten-tantalum denitration catalyst. In the catalyst, the molar ratio of cerium to tungsten to tantalum is 2-5:1-4:1-4. A preparation method of the cerium-tungsten-tantalum denitration catalyst comprises the following steps: (1) firstly, mixing and dissolving a cerium source and a tungsten source in water, and then adding a tantalum source to obtain a mixed solution; (2) adjusting the pH of the mixed solution obtained in step (1) by using a weak base solution, so that the pH value reaches 9-11; (3) sequentially filtering, drying and grinding the mixed solution obtained in step (2) to prepare an active component; (4) mixing the active component obtained in step (3) with carrier powder, an assistant and water and uniformly mixing to obtain a paste stock; (5) performing extrusion molding on the paste stock obtained in step (4) to obtain a molding catalyst; (6) drying the molding catalyst obtained in step (5) to obtain a dried molding catalyst; and (7) calcining the dried molding catalyst obtained in step (6) to obtain the cerium-tungsten-tantalum denitration catalyst. The denitration catalyst prepared according to the invention is nonhazardous, highin activity and long in service life.

The invention relates to the technical field of air pollution control, and discloses a phosphoric acid-modified cerium oxide catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) soaking cerium oxide in a phosphoric acid solution, then filtering out the cerium oxide and washing until neutral, and drying; (2) drying the dried cerium oxide at 100-400° C. Calcined for 1-4 hours to obtain a phosphoric acid-modified cerium oxide catalyst. The catalyst prepared by the preparation method of the present invention can be used for the catalytic oxidation degradation of chlorine-containing volatile organic compounds. It is not easy to produce toxic by-products when removing sexual organic matter, and there is no secondary pollution.

The invention discloses preparation of high temperature stability supported cobaltosic oxide based on strong metal and carrier interaction, a product and application. The preparation comprises the following steps: using cobalt nitrate as a cobalt source, sodium carbonate as a precipitator and a cerium-zirconium-aluminum solid solution as a carrier, and using a deposition precipitation method to prepare supported Co3O4; putting cobalt nitrate and the cerium-zirconium-aluminum solid solution into a flask, adding a deionized water soluition, stirring to completely dissolve cobalt nitrate, slowlyadding the sodium carbonate solution into suspension liquid, adjusting the pH to be 9, stirring to carry out ultrasonic oscillation, carrying out filtering, washing and frozen drying on the obtained product, and carrying out calcination at the temperature of 800 DEG C for 3 h to obtain a powdery Co3O4 / CeZrAlO material. After high-temperature processing of 800 DEG C, the catalyst is applied to a propane catalytic combustion reaction, and is still of extremely high activity. The raw materials of the catalyst disclosed by the invention are easily obtained, the technology is simple, the catalyst is high in high temperature stability, and the catalyst has excellent application prospects.

The invention discloses a manganese-nickel-copper-based water treatment catalyst, a preparation method and application thereof. The catalyst uses a mixture of zirconium hydrogen phosphate and zirconium oxide as a carrier and a manganese-nickel-copper composite oxide as a catalytic active component. The active component, the co-catalyst colloid solution and the catalyst carrier are uniformly stirred, aged, extruded, dried and roasted. The catalyst is environmentally friendly, has low cost, and can efficiently catalyze the reduction of water pollutants such as p-nitrophenol, methyl orange, and methylene blue.

The invention belongs to the technical field of catalyst preparation, and in particular relates to a light-assisted thermal catalyst and a preparation method and application thereof. The catalyst includes a carrier and an active component, the active component includes a first active component and a second active component, the first active component includes Pd and Ce; the second active component includes Mn. The present invention creatively provides a catalyst suitable for light-assisted thermal catalytic combustion. When the light-assisted thermal catalyst is applied to catalytic combustion, the lattice oxygen of the catalyst itself can be activated, the oxygen overflow can be greatly accelerated, and the crystal lattice of the catalyst itself can be activated. Lattice oxygen reacts with methane, CO and other gases to generate carbon dioxide and water. The oxygen in the reactant is continuously adsorbed on the surface of the catalyst to form chemical adsorption oxygen and then converted into lattice oxygen, thereby ensuring the normal progress of the catalytic combustion reaction.

The invention discloses a preparation method for a Cr-Ce composite degradation material for automobile tail gases. The degradation material is prepared from the following raw materials: tetraethylammonium hydroxide, potassium hydroxide, ferric sulfate, silicon dioxide, fly ash, chromium nitrate, cerium nitrate, aluminum oxide powder and the like. According to the method disclosed by the invention,a molecular sieve is prepared by crystallization of the silicon dioxide, a microporous crystal structure and high-temperature high-humidity-heat resistance of the molecular sieve are utilized, the molecular sieve is used as a carrier of a treatment material of the automobile tail gases, the fly ash is processed by an acid, the processed fly ash is processed by an alkali, then the processed fry ash is used as a base body to load a Cr-Ce composite oxide, so that degradation space is provided for organic pollution, and adsorption and degradation types of organic matter are greatly increased; andCr-Ce composite particles are deposited into the structurally-stable carrier through chemical impregnation and ultrasonic treatment methods, and the degradation material has a very good catalytic effect on nitrogen oxides in the tail gases, improves a conversion rate of the nitrogen oxides, effectively reduces pollution to the environment caused by waste-gas emission, satisfies the demand for current automobile tail gas treatment, and can realize industrialized production.

A new type of ceramic membrane tube with catalytic function and a preparation method thereof, which includes a support body with one end open, a separation membrane coated on the surface of the support body, catalytic cotton filled in the internal cavity of the support body, and a catalytic cotton sealed at the opening of the support body. Honeycomb ceramic baffle used to block pressed catalytic wool. The advantages of the present invention are that the method is novel and simple to implement, maintains the original structure and filtering function of the membrane tube, increases the catalytic function of the membrane tube, increases the contact area between the catalytically active component and the pre-filtered gas, and enhances the efficiency of catalytic purification. Effect, and because the catalyst and membrane tube can be separated, the catalytic components of the ceramic membrane tube can be replaced or reprocessed after being used for a period of time, which extends the service life of the membrane tube and reduces the cost of use.

The invention discloses a CeO2 / TiO2 nanometer composite hollow sphere catalyst and a preparation method thereof. The CeO2 / TiO2 nanometer composite hollow sphere catalyst is prepared by firstly preparing CeO2 / TiO2 coated polystyrene composite microspheres by using polystyrene as a template, and using tetrabutyl titanate and cerium nitrate hexahydrate as wall materials, and through combination of a sol-gel method with a precipitation method, and then performing calcination to obtain the product, wherein the using amount ratio of polystyrene, tetrabutyl titanate and cerium nitrate hexahydrate is 0.1-0.3g:0.2-8*10<-3>mol:1-6*10<-3>mol. The CeO2 / TiO2 nanometer composite hollow sphere catalyst prepared in the invention is uniform in size, good in photocatalysis, and good in thermal stability.

The invention provides an egg-shell oxygen carrier and a preparation method of the egg-shell oxygen carrier. The preparation method comprises the following steps of: loading CeO2-ZrO2 on an egg-shell hollow nanometer SiO2 carrier so as to form a composite carrier with nanopore active components in a hollow structure; dispersing the egg-shell hollow nanometer SiO2 in deionized water; then adding CTAB solution; heating at a constant temperature; preparing a solution by using Ce(NO3)2.6H2O and Zr(NO3)4.5H2O as raw materials; slowly adding NaOH solution till the pH is 7-8; adding egg-shell hollow nanometer SiO2 solution for aging for 3-5h; then carrying out suction filtration and washing for multiple times; then drying and grinding; and finally roasting so as to obtain the egg-shell oxygen carrier. The obtained egg-shell oxygen carrier can be applied to preparing synthesis gas and hydrogen in a step manner. The egg-shell oxygen carrier is good in oxygen storage performance and can be applied in the preparation of synthesis gas and hydrogen in a methane conversion step manner, so that the methane conversion reaction is high in conversion rate and high in CO and H2 selectivity, and the purity of the hydrogen obtained through water-splitting is high.

The invention provides a catalyst for catalytically combusting a chlorine-containing organic substance and a preparation method thereof. The catalyst has excellent oxygen storage and release performance and oxygen mobility by sufficiently utilizing the acidity of CeO2 and reversible conversion of Ce<4+> / Ce<3+>, and the exposed crystal surface of CeO2 is changed by using CNTS which has high specific surface area and rich mesoporous channels as a carrier, so that the oxygen mobility is further improved, the catalyzing performance is further improved, and the catalyst can stably convert chlorine-containing organic substances into H2O, CO2 and HCl for a long time in the air environment.

The invention discloses a preparation method of a Cr-Ce composite catalytic degradation architectural coating, the Cr-Ce composite catalytic degradation architectural coating is prepared from paraffin, an emulsifier, isophorone diisocyanate, polyethylene glycol, dibutyltin dilaurate, hydroxyethyl methacrylate, fly ash, chromium nitrate, cerium nitrate, alumina powder, and other raw materials, theCr-Ce composite catalytic degradation architectural coating is based on a waterborne polyurethane coating with excellent mechanical properties, fire resistance and low toxicity, the fly ash is respectively treated by an acid and an alkali to be used as a substrate to load a Cr-Ce composite oxide to provide a degradation space for organic pollution, adsorption and degradation types of organic matters are greatly increased, by combination of a paraffin emulsion, the problem of easy aggregation and precipitation of Cr-Ce composite supported zeolite can be solved, coating performance stability canbe ensured, the obtained architectural coating has excellent functions of adsorption, degradation and elimination of volatile organic compounds, the process is simple, the operation is convenient, raw material cost and processing cost both are low, and the application is wide.