41results about How to "Many active centers" patented technology

The invention discloses a catalyst for producing propylene by catalytic pyrolysis and a preparation method thereof. Calculated as the total weight of the catalyst, the catalyst comprises 20 to 40 weight percent of element-modified molecular sieve and 60 to 80 weight percent of heat-resistant inorganic oxide, wherein the content of a modified element is between 1 and 10 weight percent calculated as the total weight of the molecular sieve, the average grain diameter of crystal grains of the molecular sieve is between 10 and 100nm, and the modified element is one or a mixture of more of family IB metals and/or phosphorus. The catalyst is used for reactions that low carbon olefin, particularly the propylene is produced by C6-C12 olefins through catalytic pyrolysis, and has higher conversion rate of the C6-C12 olefins and yield of the propylene.

The invention discloses a preparation method for a low silicon-aluminum ratio nanosheet flower cluster-like mordenite molecular sieve. The preparation process of the mordenite molecular sieve includes: dissolving an aluminum source and an alkali source in deionized water, adding silica sol into the obtained clarified solution to obtain a uniform white colloid, transferring the white colloid into a reaction kettle to undergo hydrothermal reaction, thus obtaining the low silicon-aluminum ratio nanosheet flower cluster-like mordenite molecular sieve. The mordenite molecular sieve prepared by the invention has the advantages of wide silicon source and aluminum source, low silicon-aluminum ratio, multiple active centers, no adding of any surfactant, low preparation cost, less environmental pollution and large specific surface area, and is conducive to spread of the reactants and product and acceleration of the reaction rate, thus being widely applicable in adsorption, separation, catalytic cracking, isomerization and other fields.

The invention discloses a heteroatom doped cobalt metal catalyst and a preparation method thereof, and belongs to the field of catalyst synthesis technology and application. The method for preparing the cobalt metal catalyst by heteroatom doping comprises the following steps: dispersing and dissolving biomolecules in a solution, sequentially adding a cobalt salt and an organic ligand, stirring, drying, and directly carbonizing at a high temperature to prepare the heteroatom (nitrogen, phosphorus and sulfur) doped cobalt metal catalyst in one step. According to the catalyst disclosed by the invention, the complete morphology is kept; meanwhile, the catalyst has a high specific surface area, a hierarchical porous structure and good methanol resistance and stability; and the preparation method is simple, the raw materials are easy to obtain, the price is low, the obtained catalyst shows remarkable fuel cell cathode oxygen reduction reaction (ORR) activity in an alkaline medium, the good method is provided for exploring the new non-noble metal catalyst material, and a basis is provided for further experimental optimization and industrial production.

The invention particularly relates to a forsterite bio-filter material for sewage treatment and a preparation method of the forsterite bio-filter material. The technical scheme is as follows: the preparation method comprises the following step: uniformly mixing 45-55wt% of forsterite raw ore fine powder, 20-30wt% of talc fine powder, 15-25wt% of magnesium oxide fine powder and 2-6wt% of dravite micropowder as raw materials with additional 2-6wt% of starch to prepare a mixed material; then, putting the mixed material and polystyrene balls in a pelletizer in a volume ratio of the polystyrene balls and the mixed material of (1.5-2.0) to 1; then, adding 10-20wt% of water to prepare particles with the grain size being 5-13mm; and then, roasting the prepared particles for 16-24 hours at 110-150 DEG C, and sintering for 2-4 hours at 1300-1500 DEG C to prepare the forsterite bio-filter material for sewage treatment. The forsterite bio-filter material for sewage treatment is simple in process and wide in source of raw materials and the prepared forsterite bio-filter material for sewage treatment has the characteristics of good flora biofilm culturing effect, high flora survival rate, good decoloring effect and high strength.

The invention discloses a high-entropy ferrite porous ceramic material as well as a preparation method and application thereof, and belongs to the field of inorganic functional materials. The chemical composition of the high-entropy ferrite porous ceramic material is (Mg<0.4-x>Co<x>Ni<0.2>Zn<0.2>Cu<0.2>)Fe<2>O<4>, wherein x is more than 0 and less than or equal to 0.2. The preparation method comprises the following steps: dissolving glycine, magnesium nitrate, cobalt nitrate, nickel nitrate, zinc nitrate, copper nitrate and ferric nitrate in water to obtain a mixed solution; adjusting the pH value of the obtained mixed solution, and conducting heating until the solution is subjected to combustion reaction to obtain precursor powder; and carrying out heat treatment, molding and sintering on the obtained precursor powder to obtain the high-entropy ferrite porous ceramic material. The high-entropy ferrite porous ceramic material disclosed by the invention integrates the advantages of a high-entropy effect and a foam structure synergistic effect, has a self-supporting capability and a high specific surface area, is convenient to transport, store and recycle, and has a good application prospect.

The invention discloses a cobaltosic oxide catalyst, a preparation method and application thereof. The preparation method includes: (a) preparing a cobaltosic oxide nanorod Co3O4-110 with an exposed crystal surface (110); and (b) doping N atom to the surface of Co3O4-110 to obtain the cobaltosic oxide catalyst N-Co3O4-110. The preparation method of the cobaltosic oxide catalyst provided by the invention has easily controllable reaction conditions, can be operated at room temperature, and by changing the nitrogen plasma treatment time, different nitrogen doping amounts and oxygen vacancy content can be obtained. The cobaltosic oxide catalyst obtained by the preparation method disclosed by the invention has the advantages of simple and easily available raw materials, and lower cost than platinum, palladium and the like, and simple operation method, and is suitable for industrial application. The cobaltosic oxide catalyst has more surface defects, higher surface oxygen content and highercharge transfer efficiency, and can be used for catalyzing various oxidation reactions.

The invention relates to a modification method for forming an alpha-alumina carrier of a silver catalyst used for producing ethylene oxide through ethylene oxidation. The method has the beneficial effect of increasing the pore canal and specific surface area of the carrier by carrying out acid-alkali combined treatment on the formed alpha-alumina carrier. The silver catalyst prepared from and supported by the alpha-alumina carrier prepared by the method is beneficial to increase of reaction centers and diffusion of products. The modified alpha-alumina carrier shows good selectivity when applied to the reaction process of producing ethylene oxide through ethylene oxidation.

The invention provides a chitosan entrapment body of nano-scale arsenous acid, which comprises the following components in part by weight: 0.2 to 0.4 part of nano chitosan, 0.001 to 0.002 part of nano arsenous acid, 0.00024 to 0.02 part of ion shift variant agent, 0.005 to 0.03 part of surface active agent, 0.2 to 0.4 part of lactic acid or acetic acid, 0.1 to 0.3 part of fatty alcohol polyethenoxy ether, and the balance of deionized water. An integration process of three highly difficult reactions including the preparation of an arsenous acid pre-dispersed intermediate, the preparation of an active nano chitosan three-dimensional network colloid and the entrapment to the nano arsenous acid by the active nano chitosan three-dimensional network colloid is achieved by a 'one-step method', and nano arsenous acid particles in the manufactured chitosan entrapment body have the main area particle size distribution of between 20 and 50 nanometers and show the characteristics of the arsenous acid. The chitosan entrapment body of the nano-scale arsenous acid has the advantages of high bioavailability, enhanced slow-release property, reduced dosage, low toxic or side effect and enhanced anti-cancer curative effect, and provides a selection path with high-tech synthesis for arsenic medicaments.

The invention belongs to the technical field of catalysts, and particularly relates to a composite metal oxide catalyst for one-step preparation of isobutyl isobutyrate from isobutyraldehyde, and a preparation method of the composite metal oxide catalyst. According to the invention, carbon black is used as an inert matrix, a nanometer CuO-MxOy (wherein M is Ce, Cr or Ti) carrier with a mesoporousstructure is synthesized by combining a space synthesis method with a hydrothermal microwave method, and then aluminum isobutoxide is loaded on the surface of the carrier by utilizing a supercriticalfluid impregnation method to prepare the catalyst. The preparation method is simple; the catalyst has a good structure and a good surface distribution state; a mesoporous structure significantly improves the stability of the catalyst and prolongs the service life of the catalyst, so the catalyst has a higher specific surface area and can be used in a reaction for preparing isobutyl isobutyrate from isobutyraldehyde in one step; and the reaction activity of the catalyst and the selectivity of isobutyl isobutyrate are obviously improved.

The invention discloses a composite scavenging agent for scavenging methyl blue and a preparation method thereof, wherein the composite scavenging agent comprises attapulgite and nano yttrium oxide, wherein the nano yttrium oxide is loaded on the attapulgite, and occupies 3-15% of the attapulgite in mass. The preparation method comprises the following steps of: firstly dissolving yttrium salt in water by adopting a mixed immersing method; adding modified attapulgite powder, regulating pH as 5-8, stirring for 4-12 hours through water bath of 80 DEG C, filtering and washing by deionized water; drying overnight in a baking oven of 80 DEG C; and finally forging, thereby obtaining the composite scavenging agent. According to the invention, firstly, the attapulgite with great specific surface area and high absorption performance is combined with yttrium oxide with favorable hydration performance (a rich active center can be generated by hydration), and the preparation method has the characteristics of high methyl blue decoloration rate, rapid effectiveness, simple process and the like; and the composite scavenging agent can reach 90% maximally for cationic dye decoloration rate under the natural environment within 10 minutes.

The invention discloses a high-strength large-specific-surface-area titanium dioxide catalyst for sulfur recovery and a preparation method thereof, and belongs to the technical field of catalysts andpreparation thereof. The preparation method comprises the following steps: firstly, mixing wet metatitanic acid serving as a raw material with alumina dry glue powder and sesbania powder in proportion, rolling for a period of time, adding a certain amount of mixed solution of water, organic acid and nitric acid into the rolled materials, continuously rolling, preserving moisture and ageing; and adding the material obtained by moisturizing and aging into an automatic pressing and banded extruder, selecting a clover template/four-leaf clover template for band extrusion, drying the extrudate through a drying oven to remove water, and roasting through a muffle furnace to obtain the product. The wet metatitanic acid is selected as a raw material of the catalyst, and compared with a dry raw material, the wet metatitanic acid is stable in chemical property and large in number of active centers; the catalyst is in a clover/clover shape, and compared with a cylinder in the prior art, the crushing strength and the specific surface area of the catalyst are both improved.

The invention discloses a novel graphene three-dimensional skeleton porous photocatalysis film preparation method, which comprises: embedding different types of semiconductor nanometer materials (p-type and n-type) with photocatalytic ability in graphene oxide, and carrying out bulking and reducing treatment to obtain the graphene three-dimensional skeleton porous photocatalysis film. The specificsteps comprise: 1, preparing semiconductor nanometer materials required by a photocatalysis film, wherein the semiconductor nanometer materials comprise Cu2O, Cu2O-CuO, TiO2 nano-wires, and the like;2, assembling a nano-wire/graphene oxide three-dimensional skeleton porous film material, wherein nano-wires are assembled into a graphene oxide film by using a vacuum suction filtration method, andthe nano-wire/graphene oxide is treated by using a fast freezing vacuum drying method or a bulking process to construct a three-dimensional skeleton porous structure; and 3, reducing the nano-wire/graphene oxide three-dimensional skeleton porous film, wherein the chemical structure of the nano-wire photocatalyst is maintained while the reducing of the graphene oxide film is achieved by using hydrogen iodide as a reducing agent.

The invention belongs to the technical field of fuel cells, and relates to a preparation method and application of a porous Pd-PdO nanorod. The preparation method comprises the following steps of: mixing 1, 10-phenanthroline serving as a complexing agent, potassium chloropalladite serving as a palladium source and ethanol and water serving as solvents at normal temperature to obtain a 1, 10-phenanthroline-palladium complex precursor; and calcining the 1, 10-phenanthroline-palladium complex precursor at high temperature under an air condition to obtain the porous Pd-PdO nanorod. The porous Pd-PdO nanorod obtained by the preparation method shows enhanced methanol oxidation reaction activity.

The invention discloses a preparation method of a multistage porous Rh nanosheet. The method takes 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) as a complexing agent, water and ethyl alcohol as solvents and ethylene glycol as a reducing agent, and reduces Rh<3+> into the multistage porous Rh nanosheet through hydrothermal reaction by adopting a simple HEDP-mediated wet chemistry method. The preparation method is environmentally friendly, simple, economical and suitable for industrial large-scale production. The Rh nanosheet prepared by the method has an ultrathin structure, rich pores (edge atoms) and grain boundary atoms, shows rich active centers, has high methanol adsorption energy and low reaction barrier, can be used as a catalyst for methanol electrooxidation reaction, and is a fuel cell catalyst with a great development prospect.

The invention discloses a hollow microsphere core-shell catalyst and a preparation method and an application thereof, and belongs to the field of organic chemical synthesis, and the preparation method comprises the following steps: preparing ZSM-5 hollow microspheres, and preparing ZSM-5 hollow microspheres, pseudo-boehmite and sesbania powder to obtain a ZSM-5/gamma-Al2O3 hollow microsphere carrier; and respectively dipping the ZSM-5/Al2O3 hollow microsphere core-shell catalyst in a NaCl solution and an AlCl3 solution, and carrying out a crystallization reaction so as to obtain the NaAlCl4/ZSM-5/gamma-Al2O3 hollow microsphere core-shell catalyst. The catalyst provided by the invention has a good catalytic effect on preparation of dimethyl dichlorosilane from disproportionated methyl trichlorosilane and trimethyl chlorosilane, and the yield of dimethyl dichlorosilane at 200 DEG C can reach 73% or above.