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 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 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 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.

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 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 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 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.

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.