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247results about How to "Excellent catalytic performance" patented technology

Nano-metal or metal alloy catalyst and preparing method thereof

The invention relates to a graphene aerogel-supported nano-metal or metal alloy catalyst and a preparing method thereof and belongs to the technical field of nanometer material application and catalysis. The preparing method is characterized by comprising the following steps: using graphene oxide and a metal compound as precursors, and obtaining a catalyst with small-size nano-metal and nano-metal alloy particles supported by a three-dimensional porous graphene aerogel by a continuous reduction process. In the catalyst, the varieties of the nano-metal and the nano-metal alloy are selected from Pt, Au, Ag, Pd, Ru, Rh, Pb, Fe, Co, Ni, Ir, Cu and the like; the varieties can be matched at will by any mixing ratio; the nanometer particles are about 2-6nm in size and uniformly distributed on a graphene sheet layer. Meanwhile, the graphene is assembled into a three-dimensional porous aerogel structure, the average size of pore diameters is 1-2 micrometers, high specific area, high electron transmission rate and high mass transmission rate can be obtained, and the agglomeration of the graphene and the nanometer particles is prevented. The composite has excellent catalytic performance, and the components of the catalyst can be selected according to different requirements.
Owner:JIANGSU UNIV

Method for preparing tobacco sheet capable of reducing harmful substances in smoke

ActiveCN102429318AExcellent catalytic performanceStrong physical adsorption performanceTobacco preparationTobacco treatmentOxidePyrolysis
The invention relates to a method for preparing a tobacco sheet capable of reducing harmful substances in smoke, which comprises the following steps of: (1) after extracting tobacco powder and tobacco stalks, which are used as the raw materials, by hot water or 75 to 95 mass percent of ethanol, concentrating into tobacco concentrated solution with the solid content of 20 to 55 percent; (2) adding 0.05 to 5 mass percent of metallic oxide, metal salt and a mixture in any ratio into the tobacco concentrated solution; (3) adding 0.05 to 8 percent of inorganic mineral adsorbing material into the tobacco concentrated solution to obtain a composite additive; and (4) coating the tobacco concentrated solution added with the composite additive on a substrate of the tobacco sheet. When the tobacco sheet prepared by the method is burnt, on one hand, the pyrolysis process in the burning process can be catalyzed and the generation of benzene ring substances and the like can be reduced, and on the other hand, generated particle substances with high molecular mass, particularly substances containing benzene rings, are adsorbed into a pore structure of the additive, so that the aim of avoiding the harmful substances being sucked into the mouth is fulfilled.
Owner:HUBEI CHINA TOBACCO IND +1

Cerium-based composite oxide VOCs (volatile organic compounds) combustion catalyst using metal organic framework as template and preparation method thereof

The invention discloses a cerium-based composite oxide VOCs (volatile organic compounds) combustion catalyst using a metal organic framework as a template and a preparation method thereof. The preparation method comprises the following steps of soaking and mixing cerium-based metal organic framework material and transition metal salt in a solvent; taking out the materials; drying the materials; grinding the materials into powder; roasting the materials in the air to obtain the cerium-based composite oxide VOCs combustion catalyst using the metal organic framework as the template. The metal organic framework is used for introducing into transition metal. Compared with cerium-based composite oxide prepared by a conventional method, the material has the advantages that the dispersion degree of the transition metal is greatly improved; the catalytic capability of the prepared cerium-based composite oxide on the organic waste gas is obviously improved; the higher catalytic activity is realized; after the cyclic multi-time catalysis reaction, good catalytic performance can still be maintained; the wide application prospects are realized in the organic waste gas catalytic oxidization field. Meanwhile, the preparation process of the method is simple and convenient; the implementation is easy; the preparation conditions are mild; the energy consumption is low; the industrial large-scaleproduction is facilitated.
Owner:SOUTH CHINA UNIV OF TECH

Preparation method for functionalized graphene loaded noble metal nano-crystalline composite catalyst

The invention discloses a preparation method for a functionalized graphene loaded noble metal nano-crystalline composite catalyst, which synchronously realizes reduction of a noble metal precursor and graphite oxide to obtain the composite catalyst in a structure that grapheme with surface modified by sulfonic acid is uniformly loaded with noble metal nano-crystalline. The method comprises the following steps: 1, preparing the graphite oxide; 2, carrying out covalent modification on the graphite oxide by benzenesulfonic acid; and 3, synchronously reducing the noble metal precursor and the graphite oxide and stabilizing noble metal nano particles by utilizing a coordination effect between a sulfonic acid group and the noble metal. Meanwhile, the surface sulfonic acid group has the hydrophilcity so that the catalyst can be uniformly dispersed in a water solution. A result shows that the noble metal nano particles with narrow size distribution can be uniformly distributed on the surface of graphene to form the efficient catalyst which has good dispersion in the water solution. Catalytic reduction reaction of p-nitrophenol proves that the catalyst has a very excellent catalysis performance; the catalyst still keeps the previous activity after being recycled and reutilized for five times.
Owner:HENAN AGRICULTURAL UNIVERSITY

Sulfate reducing bacteria embedded particle for treating ionic rare earth mine wastewater as well as preparation method and application thereof

The invention relates to the field of water environment protection, in particular to sulfate reducing bacteria embedded particles for treating ionic rare earth mine wastewater as well as a preparationmethod and an application of the sulfate reducing bacteria embedded particles, and solves the problem that sulfate reducing bacteria in SRB treatment acid mine wastewater are poisoned by heavy metalsand insufficient carbon sources to influence the practical application effect. The embedded particle is of a multi-layer structure and is sequentially composed of a sulfate reducing bacteria biofilmculturing charcoal layer, a composite hydrolase slow-release carbon source layer, an adsorption layer and a cross-linking layer from inside to outside. The invention provides an embedded particle integrated double hydrolysis catalysis system, the release of a slow-release carbon source can be accelerated, an anaerobic environment required by reaction is provided, the toxic action of heavy metals and acid radical ions on sulfate reducing bacteria is reduced, the practical application effect is improved, and sulfate radicals and heavy metal ions in acidic mine wastewater and ionic rare earth mine wastewater can be effectively reduced.
Owner:JIANGXI ACADEMY OF SCI

Deep hydrodesulfurization catalyst preparation method by carrying nickel and tungsten on multistage porous zeolite

The invention discloses a deep hydrodesulfurization catalyst preparation method by carrying nickel and tungsten on multistage porous zeolite and relates to the preparation method of the deep hydrodesulfurization catalyst. The preparation method is used for solving the problem that the existing hydrodesulfurization catalyst has lower catalytic performance on molecules with regional block effect. The preparation method comprises the following steps of: (1) calcining zeolite to obta microporous hydrogen-type zeolite; (2) adding the microporous hydrogen-type zeolite into acid solution, and then carrying out calcining treatment to obtain dealuminated zeolite; (3) adding the dealuminated zeolite into alkaline solution for treatment, then carrying out ion exchange by using ammonium nitrate, and calcining to obtain a hydrogen desiliconized multistage porous zeolite molecular sieve; (4) adding the zeolite molecular sieve into the acid solution, and calcining to obtain strong-acid multistage porous zeolite; and (5) absorbing nickel and tungsten phase on the strong-acid multistage porous zeolite, and finishing preparation of the hydrodesulfurization catalyst. The preparation method disclosed by the invention has the advantages that the zeolite used as a material is commercial zeolite, the price is low, the mesoporous degree is improved after multistage porous treatment, and the active site of the nickel and tungsten phase is used, so that the catalytic reaction capability is better.
Owner:HARBIN INST OF TECH

Double microporous-mesoporous composite molecular sieve and preparation method thereof

InactiveCN102039201APotential industrial application value is highHigh catalytic activityCatalyst carriersMolecular sieve catalystsMolecular sieveAlkylphenol
The invention relates to a double microporous-mesoporous composite molecular sieve and a preparation method thereof. The molecular sieve is prepared by compounding Y and beta double microporous zeolites with an MCM-41 molecular sieve, and the wall of a hexagonal mesoporous phase is tightly coated by double microporous phases, so that a plurality of spherical or hemispherical empty shell structures are formed and interconnected to form a net, and the microporous phases have adjustable silicon-to-aluminum ratio and micropore content; and mixed liquid of hexadecyl trimethyl ammonium bromide and alkylphenol polyoxyethylene ether is taken as a template, pretreated silicon sources and/or aluminum sources of the double microporous phases and a synthesis mesoporous phase are introduced into a system respectively, and the Y-beta/MCM-41 double microporous-mesoporous composite molecular sieve which has the adjustable silicon-to-aluminum ratio and micropore content of the microporous phases is obtained through hydrothermal crystallization. The method is easy and convenient to operate, has high repeatability and is environmental-friendly; and by combining the advantages of the Y and beta zeolites and the mesoporous molecular sieve, the double microporous-mesoporous composite molecular sieve has high catalytic reaction performance and is used as a carrier material of a hydrocracking catalyst.
Owner:PETROCHINA CO LTD

Air flue type photocatalysis air purifier

The invention discloses an air flue type photocatalysis air purifier which comprises a shell. At least one photocatalysis structure is arranged inside the shell, and photocatalysis filter screens and an ultraviolet source are arranged in the photocatalysis structure. The air flue type photocatalysis air purifier is characterized in that, in the photocatalysis structure, the number of the photocatalysis filter screens is two, and the whole photocatalysis filter screens are in a back-and-forth zigzag W shape, a fin is arranged between the two photocatalysis filter screens, the fin is in a W shape in the length direction and is transversely connected to the interior of the shell, the width direction of the rib is coincident with the longitudinal direction of the shell, a transparent sleeve arranged in the transverse direction of the shell is installed in the middle of the fin in a penetrated mode, and the ultraviolet source is arranged in the transparent sleeve. The photocatalysis filter screens, the fin and the inner surface of the shell are all coated with photocatalysts. The air flue type photocatalysis air purifier can be installed in an air flue, and extra occupied space is not needed; meanwhile, the effective reaction area of the air flue type photocatalysis air purifier is large, the using efficiency of the ultraviolet source is high, the reaction-mass transferring capacity of the surface of the photocatalysts is high, energy consumption is small, the structure is simple, the reaction efficiency is high, and the air flue type photocatalysis air purifier is convenient to use and install.
Owner:CHONGQING UNIV
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