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

The present invention is generally directed to the evolution of new metabolic pathways and the enhancement of bioprocessing through a process herein termed recursive sequence recombination. Recursive sequence recombination entails performing iterative cycles of recombination and screening or selection to “evolve” individual genes, whole plasmids or viruses, multigene clusters, or even whole genomes. Such techniques do not require the extensive analysis and computation required by conventional methods for metabolic engineering.

A fluidized-bed catalyt for the ammoxidation reaction of olefin is composed of the carrie consisting of nano-SiO2 and silica sol, and the active component Mo(12-g)BiaFe6NicXdYeZfOgOx, where X is chosen from Mg, Co and Ca; Y is chosen from La, Ce and Sm; Z is chosen from Li, K and Rb, and Q is chosen from B, W and P.

The invention relates to a method to rehabilitate waste FCC (fluid catalytic cracking) catalyst, pertaining to recovery and resource regeneration field of waste catalyst. The invention reconstructs the frameword of catalyst through the synergistic effects of inorganic acid and organic acid, to construct developed micropores-mesoporous compound pore-channel structure system during the reconstruction process, and eliminates or passivates heavy metal of the waste catalyst, so as to dramatically increase the specific surface area of the rehabilitated catalyst; the eliminating rate of heavy metal can reach 30 percent, the micro reactor activity can be improved by more than 10 percent, and the invention has comparatively higher selectivity of liquefied gas and gasoline and lower yield ratio of coke.

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.

The invention relates to a catalytic material of a composite molecular sieve containing micropore Y-zeolite phase and mediated hole MCM- 48 phase, which is produced by taking mixed cationic and non-ion surfactant as template; the invention also relates to a preparation method of the catalytic material. By adopting a method of overgrowth and employing mixed aqueous solution of cationic surfactant: cetylíítrimethyl ammonium bromide(CTAB) and nonionic surfactant: p -octyl polyethylene phenyl ether OP-10 as template, under the alkaline hydrothermal condition the invention synthesizes composite molecular sieve which is provided with Y / MCM-48 with micropore and two-mode mediated holes. The framework ratio Si / Al of microporous phase Y-zeolite of the composite molecular sieve is higher than traditional Y-zeolite, and the ratio Si / Al and the content of the framework of microporous phase can be adjusted by changing synthesis conditions. The method of the invention has simple operation and good repeatability, which provides with optional materials for developing novel catalyst with industrial application prospect, and the synthesis has practical application value.

Disclosed is a method for producing 1,3-butadiene through oxidative dehydrogenation of normal-butene using a parallel reactor in which catalysts are charged into fixed bed reactors and are not physically mixed. More specifically, disclosed is a method for efficiently producing 1,3-butadiene through oxidative dehydrogenation of normal-butene using the parallel reactor containing multi-component bismuth molybdate-based catalysts exhibiting different activities to oxidative dehydrogenation for normal-butene isomers (1-butene, trans-2-butene and cis-2-butene), and butene separated from a C4 mixture containing normal-butene and normal-butane, as a reactant.

The present invention provides a metal oxide particle for a catalyst support comprising multiple species of metal oxides and capable of satisfactorily exerting the properties of the respective metal oxides, and also provide a production process therefor and an exhaust gas purifying catalyst obtained from this metal oxide particle. A metal oxide particle of the present invention comprises a core part 1 relatively rich in a first metal oxide and a surface layer 2 relatively rich in a second metal oxide, the core part and the surface layer each comprising a plurality of primary particles (1a, 2a), and the primary particle diameter of the second metal oxide being smaller than the primary particle diameter of the first metal oxide.

The invention discloses a nitrogen-doped activated carbon supported noble metal catalyst and an application thereof. The catalyst is composed of a carrier and an active component; the carrier is nitrogen-doped activated carbon; the active component is one of palladium, platinum, rhodium, ruthenium and iridium; and the load of the active component is not higher than 15wt% based on the mass of the carrier. The invention provides the application of the nitrogen-doped activated carbon supported noble metal catalyst to reaction for preparing an alkyl-containing halogenated aromatic aminocompound shown as a formula (II) by carrying out catalytic hydrogenation reduction on an alkyl-containing halogenated aromatic nitrocompound shown as a formula (I) to show that the nitrogen-doped activated carbon supported noble metal catalyst has the characteristics of high hydrogenation reaction rate, high catalytic activity, high selectivity and high stability.

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.

A metal cyanide complex catalyst and its preparation and application are disclosed. The formula of this catalyst is M1a[M2(CN)bL1c]d(X)m(L2)n·xSu·yL3·zH2O and its preparation method comprises: (A) adjusting pH of a mixed solution I′ of L3, M3e[M2(CN)bL1c]f, de-ionized water I, alcohol and / or ether solvent to less than 7.0, and adding it into a mixed solution II′ of M1(X)g salt, Su or Su precursor, de-ionized water II, stirring for reaction under 20° C.-120° C. for 0.5-200 hours, separating and drying to obtain a solid product; and (B) repeatedly dispersing the solid into an anhydrous organic solvent containing L2 to form a slurry, distilling, separating and drying to obtain the metal cyanide complex catalyst. The catalyst is useful in preparing polyethers, polycarbonates and polyesters by homopolymerization of epoxides, or copolymerization of epoxides with carbon dioxide or anhydrides.

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.

The invention relates to a polyvinyl-imidazole-supported cobalt carbonyl catalyst, a preparation method and an application of the catalyst. The raw materials comprise a high-molecular compound containing imidazole groups and cobalt carbonyl, and the catalyst is used to catalyze an alkoxycarbonylation reaction of ethylene oxide to synthesize methyl 3-hydroxypropanoate. The method provided by the invention has the characteristics that the cobalt carbonyl which is used in the alkoxycarbonylation reaction of ethylene oxide is loaded on the PVI high-molecular compound containing imidazole groups through coordination, and the catalyst can be recycled and reused in the premise that the catalytic activity is not decreased. The polyvinyl-imidazole-supported cobalt carbonyl catalyst prepared by the method has the advantages of simple preparation method, high stability, easiness for separation recovery and cyclic utilization after the reaction, and stable catalytic performance after repeated use for multiple times.

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.

The present invention is generally directed to the evolution of new metabolic pathways and the enhancement of bioprocessing through a process herein termed recursive sequence recombination. Recursive sequence recombination entails performing iterative cycles of recombination and screening or selection to “evolve” individual genes, whole plasmids or viruses, multigene clusters, or even whole genomes. Such techniques do not require the extensive analysis and computation required by conventional methods for metabolic engineering.

The invention is a new catalysis material and the manufacturing method for inter-hole molecular sieve containing ª†zeolite secondary unit. The invention carries on preprocess to the composition, then the obtained inorganic precursor is assembled by using basic ion and negative ion surface active agent as template agent. Introduces the secondary unit of ª†zeolite into inter hole molecular sieve frame, and designs the SBU-MCM-41 compound molecular sieve with different silicon-aluminum ratio. The invention reduces the quantity of surface active agent, ití»s easy to operate, and the material has a high water and heat stability and excellent catalysis performance.

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.

The invention provides a NaY molecular sieve aggregate with a nano-micro structure and a preparation method thereof. The method comprises the following steps of synthesizing a guide agent; preparing reaction gel by using the guide agent; performing crystallization on the reaction gel to obtain the NaY molecular sieve aggregate with the nano-micro structure, wherein organosilicon quaternary ammonium salt is introduced in the process of synthesizing the guide agent and / or preparing the reaction gel. The technical scheme provided by the invention has the advantages that the process is simple; thecost is low; the finally obtained product has a series of advantages of complete crystal phase, high silicon-aluminum ratio, high specific area, rich mesoporous-microporous structure, controllable crystal particle dimension and the like.

The invention relates to a perovskite / metal composite oxide catalyst, the general expression of which is ABO3.nAOy or ABO3.nBOz, wherein A is selected from alkaline earth metals or rare earth metals, B is selected from ferrous metals, Cu, Sr or Mn, n is in the range of 0.05-0.4, and y and z are oxygen atom numbers matching the valence states of element A and B. The catalyst can all achieve good reaction performance when it is used in flue gas desulfurization, internal combustion engine tail gas purification, CO combustion-supporting agents and light degradation and other fields.

The present invention discloses a non-supported catalyst comprising: an active metal oxide and an additive embedded in the outer surface of the active metal oxide; the active metal oxide is selected from one oxide or more oxides of iron, cobalt, nickel and copper; the additive is selected from one or more elements of iron, cobalt, nickel, copper, rhodium, manganese, potassium, silver, calcium, magnesium, zirconium, aluminum, zinc, ruthenium, platinum, sodium and phosphorus, and is in the form of an element or an oxide; the catalyst achieves the effective coordination of the supported additive and the active metal oxide, the additive can act directly on the surface of active ingredients, the promoting effect of the additive can be significantly enhanced, reducing of the active ingredients can be effectively promoted, reactivity is improved, and the catalytic properties of the catalyst can be improved. The present invention also discloses a preparation method of the non-supported catalyst.

The invention relates to a non-alloyed metal complex and its preparation and application. At least one of platinum, rhodium, ruthenium and iridium and at least one of copper, cobalt, nickel and silver contact with each other and are carried by a carrier which is any one of activated carbon, silica, titania, montmorillonite, a molecular sieve, carbon nanotubes and graphene so that the non-alloyed metal complex is obtained. The non-alloyed metal complex has a novel structure and is supported on the carrier in the form of metal-metal contact with each other. The non-alloyed metal complex has catalytic performances adjusted through change of a metal ratio, is simple and flexible and has strong adjustability. The non-alloyed metal complex has very high catalytic efficiency in catalysis of the selective reduction preparation of halogenated aniline from halogenated nitrobenzene. The non-alloyed metal complex has halogenated aniline selectivity higher than 95% and reaching 99% or more and has a good application prospect.

The invention is inter hole molecular sieve containing ª‰zeloite secondary unit. The invention uses mixed aqueous solution of hexadecyl trimethyl ammonium bromide (CTAB, basic ion surfactant) and polyethylene glycol capryl phenyl ether (OP-10, nonionics) as template agent, uses precursor ofª‰zeloite secondary unit as silicon-aluminum source, it synthesizes the sieve whose secondary unit has a high heat and water stability and high acidic property through super molecular self-assembling method of surface active agent. The invention has using value.

The invention provides a method for preparing a catalyst for preparing secondary amines by liquid-phase catalytic hydrogenation of nitrile compounds, a catalyst product obtained by the method and an application of the catalyst product. The catalyst consists of 0.1-10 wt% of an active component Pd, 0.1-80 wt% of an auxiliary agent, Ni or an oxide of Ni, on the basis of Ni metal element, and the balance of a carrier. The method comprises supporting the active component and the auxiliary agent onto the carrier by an impregnation method, a coprecipitation method, a chemical vapor deposition method, an atomic layer deposition method or any combination of the methods so as to obtain the catalyst. The catalyst obtained by the method provided by the invention can be used to realize catalytic hydrogenation of different nitriles to prepare corresponding secondary amines under mild reaction conditions, wherein the preparation is high in conversion rate and selectivity; the catalyst has high stability and can be repeatedly used for a plurality of times; and in addition, the reaction has obvious advantages of less wastewater discharge, low toxicity and the like.

A mesoporous or mesopore-micropore molecular sieve as catalytic material containing beta-zeolite secondary structure units is prepared through pre-treating the mixture of raw materials, and adding surfactant to introduce the beta-zeolite secondary structure units to the skeleton of mesoporous molecular sieve to obtain the molecular sieves SBU-MCM-41, SBU-MCM-48 and mesopore-micropore molecular sieve. Its advantages are better catalytic activity and higher thermal and hydrothermal stability.

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.

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.

The invention discloses a rare earth-doped NaYF4 / Au@CdS composite photocatalyst and a preparation method thereof. Rare earth-doped NaYF4 serves as a core, CdS nano-crystal serves as a shell and an Au nanoparticle is inlaid in the core-shell interface position, wherein the molar weight ratio of the CdS to the rare earth-doped NaYF4 is (1:50)-(50:1); and the mass percentage of Au is 0.1%-10%. The NaYF4 / Au@CdS composite photocatalyst absorbs infrared light by utilizing an up-conversion material to convert and emit visible light, and induces a near-field electromagnetic field by initiating plasma resonance of an Au nano-structure to efficiently excite CdS so as to respond to near-infrared light. Therefore, in a photocatalytic ethanol reforming hydrogen production reaction, the composite photocatalyst optimizes the utilization efficiency of near-infrared light and improves the utilization efficiency of sunlight in the photocatalytic reaction.

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.

The invention provides a method for synthesizing SAPO-34 molecular sieve by taking A type zeolite as a silicon source. According to the method, phosphoric acid is used as a phosphorus source, pseudo-boehmite is used as an aluminum source, the A type zeolite is used as the silicon source, and an organic template agent is diethylamine, morpholine, cyclohexane, triethylamine or the like; the phosphoric acid, the aluminum source, the silicon source, the organic template agent and water are prepared into synthetic gel according to the molar ratio of Al2O3:H3PO4:SiO2:R:H2O as 1.0:2.0:(0.1-1.0):(2.0-3.0):(50-100); and the synthetic gel is subjected to hydrothermal crystallization for 3-6 days at the temperature of 200 DEG C and under self-generated pressure, and then is cooled, washed, separated and dried at room temperature to obtain a product. By using the method, the SAPO-34 molecular sieve product with higher crystallinity and more uniform silicon distribution on a framework is obtained.

The invention relates to a method for modifying a silicoaluminophosphate molecular sieve, a modified molecular sieve and application thereof, and aims at solving the existing problems of complicated operation process and high cost of mesoporous template agent modifying in the prior art. The method comprises the step that only the silicoaluminophosphate molecular sieve with a microporous structureis in contact with a modifier, wherein the modifier is a compound of inorganic acid and organic acid, the inorganic acid is selected from at least one of hydrochloric acid, sulphuric acid, hydrogen nitrate and phosphoric acid, the organic acid is selected from at least one of oxalic acid, acetic acid, ethanedioic acid and citric acid, and in the compound, the weight ratio of the inorganic acid tothe organic acid is (100-80):(0.1-20). By means of the method, the problems are well solved, and the method can be applied to the industrial production of the preparation of the silicoaluminophosphatemolecular sieve with a multi-stage porous structure.

The invention discloses a nitrogen-sulfur-doped porous carbon-modified carbon nanotube-supported Pt-Ni alloy catalyst and a preparation method thereof. The preparation method comprises the following steps: step a) preparation of a carboxylated carbon nanotube / Ni-MOF; step b) preparation of a carboxylated carbon nanotube / Ni-MOF / Pt; and c) preparation of the nitrogen-sulfur-doped porous carbon-modified carbon nanotube-supported Pt-Ni alloy catalyst: putting the carboxylated carbon nanotube / Ni-MOF / Pt prepared in the step b) into a tubular furnace, introducing inert gas, carrying out heating to 550-800 DEG C, and performing roasting for 0.5-4 hours to prepare the catalyst. According to the catalyst, through doping of porous carbon, the specific surface area of a carbon nanotube is increased and the carbon nanotube is endowed with additional functional sites; and since Pt-Ni alloy nanoparticles are encapsulated in pore channels of the porous carbon, the sizes of metal particles are effectively controlled, the metal particles are uniformly dispersed, and the catalytic activity and stability of the catalyst are improved.