34results about How to "Efficient catalytic conversion" patented technology

The invention discloses a supported nanocatalyst for catalytic conversion of carbon dioxide. The supported nanocatalyst comprises active component Cu particles, carrier silica gel and an optional auxiliary agent, wherein based on the weight of a carrier, the percentage content of the active component Cu particles is 1-40%, and the percentage content of the auxiliary agent is less than or equal to 20%; the average size of the active component Cu particles is 1-20nm, and the active specific surface areas of the active component Cu particles are 100-400m<2>.g<-1>. The invention further discloses a preparation method of the supported nanocatalyst and application of the supported nanocatalyst for catalytic conversion of carbon dioxide in the synthesis of methanol by virtue of a carbon dioxide hydrogenation reaction and the carbon monoxide reaction.

The invention discloses a nicotinamide mononucleotide adenylyl transferase gene. The nucleotide sequence of the gene is shown as SEQ ID NO: 1. The amino acid sequence of the gene is shown as SEQ ID NO:2. The invention also discloses an expression vector; a method comprises the steps of using the expression vector for transforming the host cell, culturing a transformant, and acquiring nicotinamide mononucleotide adenylyl transferase gene from culture, so as to obtain the recombinant nicotinamide mononucleotide adenylyl transferase gene. The invention discloses application of the recombinant nicotinamide mononucleotide adenylyl transferase gene to in vitro conversion of nicotinamide mononucleoside NMN into nicotinamide adenine dinucleotide NAD<+>. The invention also discloses a synthesis method of nicotinamide adenine dinucleotide NAD<+>. The method uses nicotinamide mononucleoside NMN as raw material to generate nicotinamide adenine dinucleotide NAD<+> under the action of the recombinant nicotinamide mononucleotide adenylyl transferase gene.

Viologen-based ion type porous organic polymers and a preparation method and application thereof are disclosed. The viologen-based ion type porous organic polymers have a structural formula represented by a formula shown in the specification, and are prepared by quaternization reaction of 4,4'-bipyridine respectively with 4,4'-bis(chloromethyl)-1,1'-biphenyl and 4,4'-bis(bromomethyl)-1,1'-biphenyl. Since a nitrogen cation and a halogen anion are introduced into the polymer in situ, the prepared viologen-based porous organic polymer has excellent catalytic activity, and can realize efficient catalytic conversion of carbon dioxide under mild conditions. The viologen-based porous organic polymer in the invention has excellent catalytic performance in a cycloaddition reaction of an epoxy compound and CO2 under the condition of no solvent and no cocatalyst, and the reaction also has the characteristics that the catalyst is small in usage amount, and easy to separate and recycle.

The invention discloses a preparation method of grape special purpose seaweed fertilizer. The preparation method utilizes sodium alginate production enterprise by-product kelp slag as a raw material, builds a raw material pretreatment method and develops a bio-refining technology for two-step catalytic conversion of kelp slag based on an enzyme. Through the establishment of substrate and enzyme feeding strategy, substrate inhibition is reduced, high concentration substrate system enzyme efficient catalytic conversion is realized, high concentration seaweed fertilizer is prepared, recycling use of kelp processing wastes and protection of the environment are realized, a kelp industry chain is extended and the kelp processing technology and seaweed fertilizer production level are improved. The preparation method innovates a seaweed fertilizer preparation mode, utilizes kelp production enterprise by-products as raw materials, realizes waste recycling, improves seaweed resource utilization efficiency, protects the environment, reduces a seaweed fertilizer production cost, improves a yield of grapes after application, has strong practicability and can be easily industrialized. The seaweed fertilizer is a pure natural product, does not product pollution, can be degraded, satisfies industrial demands and is environmentally friendly.

The invention provides a composite catalyst for nitric oxide purification and application of the composite catalyst. The composite catalyst for nitric oxide purification, which is provided by the invention, comprises a low-temperature catalyst and a medium/high-temperature catalyst, wherein the active temperature of the low-temperature catalyst is within 100-250 DEG C; the active temperature of the medium/high-temperature catalyst is within 200-500 DEG C; the volume ratio of the low-temperature catalyst to the medium/high-temperature catalyst is (1:5)-(5:1). As advantages of the low-temperature catalyst and the medium/high-temperature catalyst with excellent properties are combined, the composite catalyst has a wide temperature range, excellent low-temperature activity and N2 generation selectivity, and is high in NOx conversion rate and applicable to diesel engine tail gas NOx control and fixed source fume denitration.

The invention discloses a polyionic liquid catalyst, an amino ionic liquid 1-vinyl-3-ethylamino imidazole bromate and a quaternary ammonium ionic liquid vinyl benzyl triethyl ammonium chloride are taken as the active components, divinyl benzene is taken as a skeleton, free radical polymerization is used to prepare and obtain a polyionic liquid material, the excellent synergistic effect between theamino ionic liquid and the quaternary ammonium ionic liquid is used, the catalytic conversion of CO2 is efficiently conducted without solvents or additional cocatalysts at the normal pressure to prepare cyclic carbonate, the stability of the catalyst is good, and the catalyst can be recycled.

The invention provides a preparation method of olefin and a method for synthesizing Chondriamide A and Chondriamide C. The preparation method of olefin comprises the steps as follows: a compound withthe structure shown in a formula (I), a palladium catalyst, a phosphorus ligand, alkali and an organic solvent are mixed and react at the normal temperature under light, and olefin with the structureshown in a formula (II) is obtained. Through selection of the specific phosphorus ligand, the method can realize efficient catalytic conversion at the room temperature under the action of photocatalysis, has mild reaction conditions, is simple to operate, meets the requirement for developing green and environment-friendly chemistry, and has more universal substrate selection range and functional group compatibility and excellent chemical selectivity. The method can be successfully applied to a scheme for introducing C-C double bonds in complex molecules and a synthesis strategy for optimizingpart of drug molecules, can improve the synthesis efficiency and reduce the cost and has industrial synthesis value and prospects.

The invention belongs to the technical field of lithium-sulfur batteries, and particularly discloses a nickel nitride@nitrogen-doped porous carbon sphere material. The nickel nitride@nitrogen-doped porous carbon sphere material is a porous carbon sphere which comprises a plurality of template etching holes and is of a through hole structure; the carbon skeleton of the porous carbon sphere is nitrogen-doped disordered carbon; active particles are distributed in the skeleton in an in-situ dispersion manner; the active particles are nickel nitride particles coated with in-situ graphitized carbonon the surfaces. The invention further provides a preparation method of the material and application of the material in a lithium-sulfur battery. The carbon material is uniform in granularity, the active substance sulfur can be efficiently stored due to the rich through macroporous structure, rich reaction interfaces and lithium ion transmission channels are provided, and efficient electronic conductivity can be provided through local graphitization. In addition, the polarity of the carbon substrate can be improved through the nitrogen-doped porous carbon spheres, and the nitrogen-doped porouscarbon spheres have strong adsorption conversion capacity on polysulfide in cooperation with high-dispersion nickel nitride particles.

The invention discloses a low-temperature methanation catalyst and a preparation method thereof. The low-temperature methanation catalyst comprises an active component, a surfactant, a structural auxiliary agent and a cocatalyst, wherein the active component is Ni; the structure auxiliary agent is a composite structure auxiliary agent composed of Al2O3 and diatomite; the cocatalyst is one or two of La2O3, MgO, CuO and MnO; the content of the active component accounts for 50%-75% of the total mass of the low-temperature methanation catalyst, and the content of the cocatalyst accounts for 0.4%-0.8% of the total mass of the low-temperature methanation catalyst. The method is lower in reaction temperature, lower in energy consumption and simple to operate, has high catalytic activity and longservice life in a low-temperature environment, and can realize efficient catalytic conversion of CO and CO2.

A catalyst for preparing dimethyl carbonate from epoxide, methanol and carbon dioxide comprises 0.005-20 wt% of a metal oxide, and the balance of an HZSM-5 molecular sieve. The catalyst is directly used in a one-pot reaction of CO2, methanol and epoxide to prepare dimethyl carbonate, and has the advantages of simple reaction steps, low cost and broad application prospect.

The invention provides a self-supporting electrode and a preparation method thereof and a lithium-sulfur battery, and the preparation method of the self-supporting electrode comprises the following steps: loading a microwave absorbent containing transition metal and a conductive modifier on the surface of biomass; placing the treated biomass material in a magnetic field and a microwave field, and carrying out hydrothermal reaction to obtain a matrix electrode; and carrying out sulfur loading treatment on the obtained matrix electrode to obtain the self-supporting electrode. According to the preparation method, the self-supporting electrode is prepared by adopting uniform magnetic field induction to assist one-step microwave hydrothermal, and compared with preparation of other electrode materials, the prepared electrode material has the advantages that addition of a binder, a conductive agent and the like is avoided, and the method is simple, convenient, efficient, mild in condition, low in cost, energy-saving, environment-friendly, high in independence and capable of being produced in batches. Compared with a coated electrode, the surface loading capacity of sulfur of the electrode material is greatly improved.

The invention discloses a precise metal cluster-based composite catalyst as well as preparation and application thereof. According to the precise metal cluster-based composite catalyst, a metal nanocluster of metal gold, silver, palladium, platinum or alloys thereof is used as an active center and is compounded with a carrier with ion exchange capacity to form the catalyst. The catalyst disclosed by the invention has excellent catalytic performance when being applied to catalysis of carbon-carbon coupling reactions such as carbon dioxide reduction coupling and Suzuki cross coupling reactions. The material has a plurality of advantages and has a certain industrial application prospect. The catalyst in the method is low in metal content, high in efficiency, low in cost and small in environmental pollution.

The invention discloses a diesel engine tail gas after-treatment system meeting near-zero emission. The system integrates the functions of a diesel engine PNA adsorptive NOx catalyst, a Mini-Burner micro burner, an SCRF catalyst, an SCR catalyst, an ASC ammonia trapping system and an electric control system, carries out coordinated treatment on main pollutants PM and NOx in diesel engine tail gas, and can carry out heat management temperature raising on a diesel engine under a low-temperature working condition, and efficient catalytic conversion of the diesel engine after-treatment system is achieved. According to the system scheme, the higher conversion efficiency of NOx can be achieved, the requirement of higher emission regulations is met, and the system is suitable for application and popularization.

The invention discloses a solid acid-bimetallic nanoparticle composite material as well as a preparation method and application thereof. The composite material disclosed by the invention is prepared from a solid acid carrier Al2O3 and loaded Pd-Co bimetallic nanoparticles. The preparation method comprises the following steps: 1) dispersing an aluminum salt, a polydentate carboxylic acid ligand, an acid, a palladium salt and a cobalt salt in an organic solvent, and carrying out a solvothermal reaction with step-by-step heating in a reducing atmosphere to obtain a Pd-Co bimetallic nanoparticle-loaded MOF-253 material; and 2) placing the MOF-253 material loaded with the Pd-Co bimetallic nanoparticles in an oxidizing atmosphere for roasting, and then placing the MOF-253 material loaded with the Pd-Co bimetallic nanoparticles in a reducing atmosphere for heat treatment to obtain the solid acid-bimetallic nanoparticle composite material. The composite material can resist poisoning, has high catalytic activity and good stability, and is suitable for catalytic oxidation of chlorine-containing volatile organic compounds.