288results about How to "Facilitate catalytic reactions" patented technology

The invention discloses a graphene/ stannic oxide nanometer compounding resistance type film gas sensor, which takes ceramics as a basal body. The surface of the ceramic basal body is photo-etched and evaporated with multiple pairs of interdigital gold electrodes, and is coated with gas-sensitive films of graphene and stannic oxide nanometer composite, and the manufactured resistance type film gas sensor has the advantages of simple manufacturing process and low cost. The gas-sensitive film is composed of a grapheme namosheet layer in a three-dimensional nano-structure and stannic oxide crystal particle composite with an orientated growth characteristic, the introduction of the graphene can favorably reduce the resistance of sensor elements, and the formation of the three-dimensional nano-structure can obviously enhance the specific surface area of the composite, thus the absorption and the diffusion of the gas can be promoted so as to greatly enhance the room temperature gas sensitive response sensitivity of elements. The graphene/stannic oxide nanometer compounding resistance type film gas sensor has the characteristics of high response sensitivity to low concentration ammonia, fast response, favorable recovering performanc, capability of carrying out the detection at the room temperature, and the like, which can be widely applied in the agricultural and industrial production process, and the room temperature detection and control of the concentration of ammonia in the atmospheric environment.

The invention discloses an eggshell type nickel-based catalyst and a preparation method and application thereof, belonging to the technical field of nickel-based catalysts and aiming at developing the eggshell type nickel-based catalyst for meeting the demand. The research shows that the eggshell type nickel-based catalyst can be prepared by dissolving nickel salt into ammonia water solution, loading the mixed solution on a catalyst carrier by adopting a spraying or immersing mode, drying, roasting and reducing. The active component of nickel is mostly centralized in an area from the surface of the carrier to the part of 0.7mm below the surface and can remarkably improve the conversion rate and the selectivity of the catalyst. The invention can be applied to the technical fields of hydrogen addition and trace amount of carbon monoxide removal from hydrogen and the like.

The invention discloses a method and a reaction system for liquid phase cycling hydrotreatment. In the method, part of a liquid phase product after the hydrotreatment is mixed with fresh raw oil in a cycling mode to form a liquid phase material; hydrogen is mixed into the liquid phase material; the hydrogen mixed amount is 1 to 20 times that of the dissolved hydrogen which makes the reaction system saturated under a reaction condition; the liquid phase material mixed and dissolved with the hydrogen is put into a reactor; a hydrogenation catalyst bed is arranged in the reactor and is immersed in the liquid phase material; the upper part of the reactor is provided with a gas phase space; a pressure control system communicated with the gas phase space is arranged on the reactor and controls the pressure in the reactor by controlling the gas exhaust quantity; and the liquid phase material dissolved with the hydrogen is put into the hydrogenation catalyst bed of the reactor to perform hydrogenation reaction. Compared with the prior art, the method ensures that the liquid phase cycling hydrotreatment can be controlled and operated stably, and obtain an ideal reaction effect.

The invention discloses a preparation method of a nitrogen-doped carbon-coated Co-based MOF derivative material, which comprises the following steps: preparing a metal organic framework compound ZIF-67, dissolving cobalt nitrate and methylimidazole in water in a reaction kettle, reacting at 150-200 DEG C for 2h, and cooling to obtain a metal organic framework compound ZIF-67; preparing a solid mixture: dissolving the metal organic framework compound ZIF-67, polyvinylpyrrolidone and melamine in water to obtain a mixed solution, freeze-drying that mixed solution to obtain the solid mixture; preparing the nitrogen-doped carbon-coated Co-based MOF derivative material: placing the solid mixture in a furnace, purging with argon, calcining at 800-1000 DEG C for 2 h, and cooling to obtain the nitrogen-doped carbon-coated Co-based MOF derivative material. In the process of preparation, the raw materials are easy to obtain and the synthetic route is simple, and the derived materials have good catalytic effect in both anodic and cathodic reactions during the process of electrolyzing water.

The invention discloses a fluidized bed reactor used for light olefin cracking and Methanol To Olefin (MTO), which comprises a reactor and a pre-riser; the reactor comprises a dense phase fluidized bed reactor and a dilute phase conveying reactor which are positioned at same axis, the pre-riser and the dilute phase conveying reactor are respectively positioned at upper part and lower part of the dense phase fluidized bed reactor; diameter of the pre-riser is smaller than diameter of the dense phase fluidized bed reactor, the upper part of the pre-riser extends into the dense phase fluidized bed reactor; an upper end port of the pre-riser in the dense phase fluidized bed reactor is sealed, and a perforate is provided on the tube wall of the pre-riser in the dense phase fluidized bed reactor; or the perforate is provided on the upper end of the pre-riser in the dense phase fluidized bed reactor, and a baffle plate is arranged over the perforate. The reactor is capable of increasing gas-solid contact efficiency, the backmixing degree of oil gas and a catalyst is less, and conversion rate of one way of the light olefin cracking and Methanol To Olefin (MTO) reactions can be greatly improved, and the target product micromolecule olefin selectivity can be greatly improved.

The invention discloses an active template method for preparing a tellurium-based precious metal alloy nanowire catalyst. The active template method comprises the following steps of: (a) dispersing tellurium nanowires in a solvent in a ratio to obtain a tellurium nanowire dispersion liquid, and dissolving a precious metal precursor in the solvent to obtain a precious metal precursor solution; (b) adding the precious metal precursor solution obtained in the step (a) into the tellurium nanowire dispersion liquid obtained in the step (a) in a ratio with stirring to obtain a mixed solution of the precious metal precursor solution and the tellurium nanowire dispersion liquid; and (c) performing replacement reaction on the mixed solution obtained in the step (b) to obtain the tellurium-based precious metal alloy nanowire catalyst. The one-dimensional catalyst prepared by the method can serve as a self-support catalyst, effectively avoids defects of particle catalyst agglomeration and Ostwald curing, and avoids a defect of Pt loss caused by corrosion of an active carbon supported carrier. Meanwhile, by the method, the catalyst can be synthesized massively and the industrialization is realized.

The invention discloses a hydrotreating method of product circulation. One part of circulation of a hydrotreated liquid phase product is mixed with a raw material into a liquid phase material, and the liquid phase material enters the upper part of a reactor. The hydrotreating method of product circulation is characterized in that the upper part of the reactor is provided with at least one air-lift tray of which the lower part is introduced with hydrogen; the hydrogen and the liquid phase material contact on the air-lift tray for the air lift of hydrogen sulfide and ammonia in the liquid phase material; meanwhile, hydrogen is further dissolved in the liquid phase material; the air-lift liquid phase material enters a catalyst bed on the lower part of the reactor for hydrotreating reaction; and air-lift gas containing hydrogen sulfide and ammonia is discharged from the top of the reactor. The reactor adopted by the invention simultaneously has the action of catalytic hydrotreating reaction and the action on causing products H2S, NH3 and the like to be discharged out of a reaction system by air lift, thus greatly improving hydrotreating reaction efficiency and enhancing technology flexibility and raw material adaptability.

The invention discloses genetic engineering bacteria for producing high-purity cephalosporin and application of the genetic engineering bacteria. The genetic engineering bacteria is obtained by introducing the following fusion gene into host bacteria: the fusion gene formed by a DNA fragment shown by nucleotides from the 7th site to the 1194th site in a sequence 1 in a sequence table and an encoding gene of a protein cefF. One of the obtained genetic engineering bacteria is called Acremonium chrysogenum cffF genetic engineering bacterium with the preserving number of CGMCC No.4515. In the invention, a Streptomyces clavuligerus sourced gene cefF with an Acremonium chrysogenum promoter PpcbC is transferred to the Acremonium chrysogenum so that the gene cefF is transcribed and expressed in vivo to enhance a catalytic reaction in which DAOC (Deacetoxycephalosporin C) is hydroxylated into DAC (Deacetylcephalosporin C), thereby reducing the content of the DAOC in a finished product CPC (Cephalosporin C), and improving the purity of industrial products.

The invention relates to a catalyst for removing nitrogen oxide through selective catalytic reduction for an automobile diesel engine adopting Ce2O3 and V2O5 double active compositions. The catalyst adopts scordierite honeycomb ceramics as a framework material, the Ce2O3 and the V2O5 as main active compositions, WO3 or MoO3 as an auxiliary catalyst composition, and TiO2 as a coating substrate, wherein the mass fraction of the main active compositions, namely the Ce2O3 and the V2O5, to the auxiliary catalyst composition WO3 or MoO3 to the coating substrate TiO2 is 1-3:6:12:85-93. The specific process comprises the following steps: preparing a TiO2 precursor solution; coating a TiO2 coating; coating an auxiliary catalyst; determining the loading of active compositions of oxides; and coating the main active compositions, namely the Ce2O3 and the V2O5. The catalyst replaces the V2O5 with high toxicity with the Ce2O3 with low toxicity, and reduces the environmental hazards of the catalyst, and the replaced catalyst has wider active temperature range, particularly greatly improves the low-temperature activity, and is particularly suitable for the traffic conditions of urban highways of China.

The invention discloses a magnetic attapulgite supported ionic liquid catalyst and a preparation method thereof. The catalyst is characterized in that ionic liquid is supported on magnetic attapulgite by means of bonding. The preparation method includes: using a silane coupling agent for modifying the ionic liquid; using a magnetic material for pretreatment of attapulgite to obtain modified attapulgite; supporting the ionic liquid modified by the silane coupling agent onto a magnetic attapulgite support. The magnetic attapulgite supported ionic liquid catalyst has the advantages of high stability, porosity, lipophilicity, dispersity and catalytic activity, recyclability and easiness in separation from products after catalysis of biodiesel.

The invention discloses a ceria-zirconia composite oxide-loaded perovskite type catalyst with sulfur resistance. The catalyst comprises an active component, a noble metal promoter and a carrier, wherein the active component is perovskite La1-xSrxMnO3 which accounts for 4 to 14wt% of the catalyst, and x is equal to 0-0.5; the noble metal promoter accounts for 0.01 to 1wt% of the catalyst; the carrier is a Ce1-yZryO2 composite oxide which accounts for 85 to 95% of the catalyst, and y is equal to 0.1-0.5. A preparation process comprises two times of loading: firstly, loading perovskite to the Ce1-yZryO2 composite oxide, and then loading the noble metal promoter to the Ce1-yZryO2 composite oxide. The catalyst provided by the invention reaches relatively high catalyst reactivity during a catalytic combustion process of VOCs, and has relatively high anti-sulfur-poisoning property.

The invention discloses a system and a method for testing the catalyst dehydrogenation performance, and belongs to the field of catalytic reaction engineering. The system comprises a hydrogen gas cylinder, a pressure reducing valve, a mass flowmeter, a check valve, an air compressor, a buffer tank, a first electric control valve, a first vortex precession flowmeter, a mixed gas distribution pipe, a catalytic reactor, a second electric control valve, a second vortex precession flowmeter, a first pressure transmitter, a first thermoelectric couple, a first hygrometer, a second pressure transmitter, a second thermoelectric couple, a second hygrometer and a data acquisition and control system. The method is characterized in that the variation of temperatures, pressures, hydrogen contents and relative humidity at an inlet and an outlet of the catalytic reactor along with time is recorded through the data acquisition and control system. The system and the method, disclosed by the invention, can simulate the design basis accident state of a nuclear power station containment accurately.

The invention relates to the field of bioengineering and biotechnologies, and discloses a method for producing 2-phenylethanol under biological catalysis. The method comprises the following steps: adding wet cells of E.coli/Pdh, E.coli/Kdc and E.coli/ADH undergoing induced expression into a biological catalysis system taking L-phenylalanine as a substrate for performing a catalytic reaction; centrifuging after finishing the reaction; extracting supernatant to obtain the 2-phenylethanol. In the method, the L-phenylalanine is taken as the substrate, and recombinant escherichia coli transformed with a phenylalanine dehydrogenase gene, a 2-keto acid decarboxylase gene and an alcohol dehydrogenase gene is added into a reaction system for performing a biological deamination, decarboxylation and reduction three-step catalytic reaction in order to generate a product, namely, phenylethanol; a coenzyme, namely, NAD (Nicotinamide Adenine Dinucleotide) is added once and can be recycled, excess ketonic acid and hydrogen sources do not need to be added, no unnecessary side products are generated, a high substrate transforming rate is achieved, and the yield of the phenylethanol is increased remarkably.

The invention relates to a preparation method and an application of a bifunctional perovskite type oxide oxygen electrode catalyst. The method comprises the following steps: mixing aqueous solutions of lanthanum nitrate, strontium nitrate, nickel nitrate and ferric nitrate, then adding ethanediol, adding the mixture into a citric acid solution, heating a water bath to 70-90 DEG C until a gel is formed; finally raising the temperature of the gel to 650-800 DEG C, preserving heat for 6-9 hours; finally obtaining a La(1-x)SrxNi(1-y)FeyO3 powder, namely the bifunctional perovskite type oxide oxygen electrode catalyst. The catalyst is used for catalyzing the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) of a fuel cell and an electrolytic tank. The main ingredients of the bifunctional perovskite type oxide oxygen electrode catalyst are from rich transition metal materials, and the cost is low.

The invention discloses a preparation method of an iron-cobalt alloy/nitrogen co-doped carbon aerogel electrode material, and relates to the field of catalyst preparation. The preparation method comprises the following steps: dispersing sodium alginate and polypyrrole in water to form a first solution, and dispersing ferric salt and cobalt salt in water to form a second solution; dropwise adding the first solution into the second solution, standing for 1h to obtain hydrogel, freeze-drying, performing calcining in nitrogen at high temperature for 1h, and pickling a sample to obtain carbon aerogel; and dipping and doping the solid powder into melamine, performing drying, and performing roasting in N2 to obtain the sodium alginate-based iron-cobalt alloy/nitrogen co-doped electrode material.The catalyst has oxygen reduction (ORR) and oxygen evolution (OER) bifunctional catalytic performance, and the zinc-air battery assembled by the catalyst has high power density and good charging and discharging performance. According to the method, cheap biomass seaweed is recycled, the preparation process is non-toxic and harmless, the cost is low, and the method has a wide industrial applicationprospect.

The invention discloses a slurry bed hydrogenation catalyst, and preparation, a design method and a use thereof; the catalyst includes the following components: a catalyst main body, molybdenum-containing red mud or hematite powder, a carrier and activated carbon; the molar ratio of a metal center Fe to the other metal center Mo in the red mud or hematite is 1:150 to 1:200, the mass ratio of the catalyst main body to activated carbon is 0.2:1 to 1.1:1, and the activated carbon has the pore size of 1-100 nm. The preparation method includes the following steps: firstly, preparing the molybdenum-containing red mud or hematite powder, then adding activated carbon with the particle size of 50-150 [mu]m into the molybdenum-containing red mud or hematite powder, mixing evenly, and thus obtaining the slurry bed hydrogenation catalyst. The slurry bed hydrogenation catalyst has the advantages of low cost, simple preparation method, and easy storage and transportation, can be discarded and has no need of recycling, is applied to heavy oil slurry bed hydrogenation, coal direct liquefaction and oil coal mixing, and achieves quite high residual oil/oil coal conversion rate and liquid yield.

The invention discloses an oxygen reduction catalyst. The oxygen reduction catalyst includes: a hollow nitrogen doped carbon sphere with a shell, and transition metal nanoparticles embedded in the shell. The oxygen reduction catalyst provided by the invention has uniform transition metal nanoparticle-nitrogen doped active centre, appropriate mesoporous channel aperture and high specific surface area, is conducive to transfer of reactants and products in the oxygen reduction process, thus having efficient oxygen reduction catalytic performance and excellent stability. The invention also discloses a preparation method of the oxygen reduction catalyst. The method includes: dispersing a microsphere template dispersed in an alkaline solution to obtain a first mixture; adding a nitrogen doped carbon source and a transition metal salt into the first mixture, and polymerizing the nitrogen doped carbon source to obtain a second mixture; and drying the second mixture, and performing calcinationsin a protective gas, thus obtaining the oxygen reduction catalyst. The invention also discloses application of the oxygen reduction catalyst in cathodes of fuel cells.

The invention relates to a preparation method of a copper-foam-based hierarchical composite oxide monolithic denitrification catalyst, and belongs to the field of environment-friendly nano catalyst materials. The catalyst includes main active components of CuO and Fe2O3. The hierarchical composite oxide monolithic denitrification catalyst is prepared by the steps of promoting in-situ growth on the surface of copper foam which is taken as a support carrier through oxidization to form a CuO nano line; under a hydrothermal condition, promoting in-situ deposition on the CuO nano line through hydrolysis of ferrous ions, and washing, drying and calcining to obtain the monolithic denitrification catalyst. The catalyst disclosed by the invention has the advantages of being simple in preparation method, free from molding, uniform in active component distribution, rapid in thermal response speed, good in denitrification performance and the like. The synthesized catalyst is applicable to treatment of nitrogen oxides in tail gas discharged from coal-fired power plants, garbage incinerators, steel mills and the like.

The invention discloses a composite graphite phase carbon nitride heterojunction photocatalyst preparation method, relates to a catalyst preparation method, and provides a preparation method of a novel silver ion doped zinc thioindate composite graphite phase carbon nitride (Ag:ZnIn2S4/g-C3N4) heterojunction photocatalyst for enhancing the photocatalytic activity of visible light, wherein silver nitrate, zinc acetate, indium acetate, thioacetamide and graphite-phase carbon nitride are subjected to a reaction according to a ratio under a hydrothermal condition to obtain the target photocatalyst. According to the invention, the novel visible light photocatalyst is clear in structure and definite in composition; by doping with Ag<+>, the photon utilization rate of ZnIn2S4 can be obviously enhanced; after compounding with g-C3N4, the diffusion range of photon-generated carriers can be enlarged, and the recombination of photon-generated electron-hole pairs is inhibited, so that the catalytic activity of visible light is enhanced; the Ag:ZnIn2S4/g-C3N4 composite material has wide prospect in the field of clean energy production and energy conversion based on high visible light activity and good hydrogen production capacity; and the obtained catalyst has broad application prospect.