33results about How to "High catalytic activity" patented technology

The invention discloses a catalyst and a preparation method thereof. The catalyst is used for furfural hydrogenation for preparing furfuryl alcohol, and adopts calcium carbonate and silica as a carrier and copper oxide as an active component; and the weight of the copper oxide is 30-75% of the total weight of the catalyst. The catalyst has the advantages of reduced production cost, high furfural conversion rate and high hydrogenation selectivity.

The invention belongs to the field of harm and tar reduction of cigarettes and relates to a catalyst for catalyzing CO oxidation in smoke of the cigarettes as well as a preparation method and an application of the catalyst. The general formula of the catalyst provided by the invention is ZnO-Fe2O3-La2O3-M-Al2O3, wherein the M is one or more metal oxides selected from oxides of Co, Ni, Mn and Mg. According to the invention, the nanometer-composite metal-oxide catalyst prepared by using a reverse-adding coprecipitation method is used in the cigarettes to ensure that the carbon monoxide release amount in the cigarette smoke can be effectively reduced by 5-30%, the harm of smoking to human body is reduced and the safety and the comfortableness of smoking process are increased. The catalyst provided by the invention is simple in preparation process, little in energy consumption and low in cost.

The invention discloses a method for preparing a catalyst for nitro reduction. The method comprises the steps: (1) cooking activated charcoal in hydrochloric acid; (2) cooking the acid treated activated charcoal in an alkaline solution; (3) cooking the alkali treated activated charcoal in an oxidant solution, and carrying out pulping; (4) mixing a palladium chloride solution, a dispersant and oxidated activated charcoal pulp, carrying out stirring, and carrying out aging, so as to obtain a suspension; or mixing assistant metal with the oxidated activated charcoal pulp, carrying out stirring and pulping, then, mixing the palladium chloride solution, the dispersant and the assistant loaded activated charcoal pulp, carrying out stirring, and carrying out aging, so as to obtain the suspension;and (5) subjecting the suspension to reduction, thereby obtaining the catalyst for nitro reduction. In addition, the invention further provides an application of the catalyst prepared by adopting theabove-mentioned method in a hydrogenation reaction of o-nitroaniline. In a nitro reduction reaction of the o-nitroaniline, the catalyst shows superior performance, the pressure drop is 0.28MPa or more, and the yield is 85.2% or more.

The invention discloses a catalyst for catalyzing methanol dehydrogenation to prepare methyl formate. The component of the catalyst is CuZrMOx, and the metal M is at least one of Ce, Ti, Mg, Al, Cr, Mn or Zn; wherein based on 100% of the weight of the metal Cu, Zr and M, the content of each metal component is as follows: 3-20% of Cu, 50-75% of Zr and the balance of M, and x is the number of oxygenatoms required by oxidation states of the metal elements Cu, Zr and M. Meanwhile, the invention also discloses a preparation method of the catalyst and a method for preparing methyl formate by catalyzing dehydrogenation of methanol. The catalyst is good in catalytic activity and high in product selectivity when catalyzing methanol dehydrogenation to prepare methyl formate.

The present invention relates to the field of catalysts, and discloses a supported carrier, a preparation method and applications thereof, wherein the supported carrier comprises ceramic fiber and analumina coating coated on the surface of the ceramic fiber. The invention further provides the preparation method of the supported carrier, the supported carrier prepared through the method, and the applications of the supported carrier. According to the present invention, the preparation process is simple; and with the application of the supported carrier in the preparation of the catalyst capable of catalyzing the combustion of organic waste gas, the high catalytic activity can be provided.

The invention discloses a Pt/MoS2 nano catalyst and a preparation method and application thereof. The Pt/MoS2 nano catalyst is prepared from MoS2 nano sheets and Pt atoms independently loaded on the surfaces of the MoS2 nano sheets. The Pt/MoS2 nano catalyst is built up by loading the platinum single atoms lonely on the substrates of the molybdenum sulfide nano sheets, not only a heterogeneous structure is achieved so that the catalyst can be easily separated, collected and recycled from a reaction system, but also the Pt/MoS2 nano catalyst can have very high catalysis activity in catalyzing hydrogenation of carbon dioxide based on the high-efficiency atom utilization rate of the single atoms, the high metal substrate mutual action and the synergistic effects of adjacent single atoms.

The invention relates to a preparing method and application of a gold-copper nanowire material. A liquid phase substitution method is adopted, by means of activity difference between metal copper andmetal gold, and the copper nanowire is used as a template and subjected to replacement reaction with a chloroauric acid solution to obtain gold-copper nanowire. The preparing method has the advantagesof being concise in technical process, mild in reaction condition, short in reaction time and low in cost, and product morphology is regular, the gold-copper nanowire catalyst is used for catalytic degradation of dye waste water, sodium borohydride is used as reductant, and the catalytic performance for catalytically degrading the dye waste water of the compound material is inspected; the catalyst is recovered and reused to inspect the reuse effect, and the catalyst has the advantages of being high in catalytic activity, high in recover and reuse rate and wide in application prospect.

The invention belongs to the field of heterogeneous catalysts and relates to a preparation method of a tungsten oxide-supported macroporous silica composite material and an application of the tungstenoxide-supported macroporous silica composite material in fuel desulfurization. The preparation method comprises: orderly mixing acetonitrile, ethanol, hydrochloric acid, a metal source and a siliconsource, continuously stirring to mix the reactants, then immersing the mixed reactants in a templating agent PMMA, carrying out wiping, drying the reactants through a vacuum drying oven for 24 hours,and carrying out calcination to obtain a macroporous silica composite material containing high dispersed tungsten. The preparation method has simple processes. In synthesis, polymethyl methacrylate asa templating agent and ammonium metatungstate as a metal source are synthesized into the tungsten oxide-loaded macroporous silica composite material. The tungsten oxide-loaded macroporous silica composite material has high and lasting catalytic activity to sulfide removal of fuel, effectively improves the desulfurization rate of oil, reduces the use amounts of a catalyst and an oxidant, is free of an organic solvent, reduces a production cost, improves oil quality, can be recovered and recycled and reduces environmental pollution.

The invention discloses a preparing method of ortho-phthalic anhydride, which is characterized by the following: choosing ortho-xylene and naphthalene as raw material; proceeding gas phase catalytic oxidation reaction; adopting two-phase, three-phase bed or four-phase bed V-Ti type accelerant; setting the accelerant as carrier material; coating catalytic activity matter with vanadic oxide and titanium oxide on the carrier; choosing compound from free alkali metal, Sb, P and Nb; adding as catalyst promoter. This invention can modify composite of the reacting rear gas, which can be used to organic chemical industry domain.

The invention provided a catalyst loaded with ionic liquid and a preparation method and application of the catalyst. According to the catalyst, the dispersion effect of metal in a carbide carrier is better, the catalytic activity is higher, the stability is better, ionic liquid is stabilized on the surface of the carrier through silicon hydroxyl, and is not prone to being loosen from the surface of the carrier, the metal is stabilized on the outer surface layer of the catalyst through the form of coordination with the ionic liquid, the influence of mass transfer is reduced, meanwhile the dispersion of the metal is increased, an external static electric filed is introduced into the preparation of the metal-based catalyst loaded with the ionic liquid for the first time, the enrichment of a metal active center on the surface layer of the ionic liquid is promoted, because the metal active center of the catalyst is distributed on the surface layer of the ionic liquid, the influence of substrate diffusion is reduced, and under the evaluated reaction conditions, the induction period of the catalyst is eliminated.

The invention relates to a preparation method and application of mesoporous manganese oxide material, which belong to the field of water treatment application. Specifically, mesoporous silicon oxide powder is dissolved into deionized water and stirred, so that uniform solution is formed, manganese source is then added into the solution and mixed uniformly, the solution is evaporated, and the obtained solid is calcined, and is finally washed with alkali, filtered, washed with water and dried. The invention adopts the mesoporous silicon oxide as template to synthesize the mesoporous manganese oxide material, the material has the characteristics of large specific surface area, regular porous structure and high catalytic activity, and moreover, when the material is adopted as catalyst, hydrogen peroxide is adopted as oxidant and rational process parameters are chosen, the effect of effectively degrading antibiotics in water can be achieved.

The invention discloses a method capable of photocatalytically degrading dyes to prepare a silver-loaded nano titanium dioxide PVP fiber in a microfluidic mode. The method comprises the steps: addinga tetrabutyl titanate solution into an acid solution, mixing to form nano titanium dioxide gel, utilizing an organic solvent to mixing the nano titanium dioxide gel with amine terminated hyperbranchedpolymer to obtain mixed liquor, then adding a silver ion solution into the mixed liquor, drying to obtain silver-loaded nano titanium dioxide powder, mixing the silver-loaded nano titanium dioxide powder with PVP powder in the organic solvent to obtain a microfluidic spinning solution and spinning the microfluidic spinning solution into the silver-loaded nano titanium dioxide PVP fiber in a microfluidic mode. Catalytic fiber preparation in the method disclosed by the invention has a high material utilization rate, and the fiber has a large self catalyzing surface area and high catalytic activity, can effectively reduce dye concentration, can reduce toxic components in dye wastewater and can protect environment and water resources.

The invention provides a supported gold nanocluster catalyst. The catalyst is prepared from an active component and a carrier, wherein the active component is gold nanoclusters, and the carrier is a CeO2 nanorod. By means of the extensive creative work of the inventor, the nano-gold clusters with ultra-small sizes are supported by the CeO2 nanorod; when being used as the carrier, the CeO2 nanorodcan stabilize the gold nanoclusters and provide oxygen vacancies, thus solving the problems that the gold nanoclusters have higher surface energy and are not stable; due to the synergistic effect thenanorod and the gold nanoclusters, the nanorod exposes the more active crystal plane of the CeO2 carrier, an oxygen species with higher activity is formed, and the catalytic activity of the supportedgold nanocluster catalyst is improved.

The preparation process of electrocatalyst for fuel cell is to introduce Pt-Ru to catalyst carrier micro ball, and includes the following steps: 1. mixing monomer, initiator, organic solvent, water and one assistant to react in protecting inert gas, centrifugal precipitating and vacuum drying to obtain polymer micro ball; and 2. reacting the mixture of the polymer micro ball and assistant aquaand pyrrole in the presence of oxidant FeCl3.6H2O, filtering to separate out solid product, washing the solid product to white, and vacuum drying to obtain electocatalyst carrier micro ball. The electrocatalyst has high catalytic activity to raise the power of fuel cell and makes the fuel cell possess excellent discharge performance.

The invention provides a preparation method for a photocatalyst with broadband spectrum response. The photocatalyst with broadband spectrum response is a nitrogen iron-doped bismuth tungstate compound titanium dioxide nano-particle or nano-tube. The preparation method for the photocatalyst with broadband spectrum response comprises the following steps: preparing a titanium dioxide nanometer material; doping nitrogen and iron into the titanium dioxide nanometer material; and preparing the nitrogen iron-doped bismuth tungstate compound titanium dioxide nanometer material. The invention combines ion doping modifying and semiconductor compound modifying techniques for expanding the ultraviolet part of the photocatalyst with broadband spectrum response scope below 387nm to a near-infrared band, the visible light and near-infrared light response of the nanometer titanium dioxide photocatalyst is realized and the catalytic activity of the nanometer carbon dioxide photocatalyst is enhanced.