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

The invention discloses a green synthesis route of furfuryl alcohol. The synthesis route is characterized in that a selective hydrogenation reaction of furfural is carried out in an aqueous solvent at room temperature under the catalysis of a porous nanometer silicon carbide supported platinum catalyst to highly-selectively synthesize furfuryl alcohol. The porous nanometer silicon carbide supported platinum catalyst has a large specific surface area and a large pore volume, and has a cauliflower-like morphology structure, and uniform distribution and high dispersiveness of platinum particles are in favor of activating the active site of the catalyst and a reaction substrate, so when the catalyst is used in the selective hydrogenation reaction of furfural under mild reaction conditions (room temperature and aqueous solvent), the activity of the catalyst is high, and the furfuryl alcohol selectivity is high. The invention also discloses a preparation method of the porous nanometer silicon carbide supported platinum catalyst. The preparation method comprises the following steps: carrying out ultrasonic dipping on SiC adopted as a carrier and chloroplatinic acid hexahydrate as an active component precursor, drying the obtained material, and reducing the dried material at 500 DEG C in highly pure hydrogen with the purity of 99.999% to prepare the catalyst.

The invention relates to a graphitized carbon foam supported carbon material / molybdenum carbide composite material, and a preparation method and an application thereof. The composite material comprises a graphitized carbon foam skeleton and a carbon material / molybdenum carbide nanodot compound attached onto the graphitized carbon foam skeleton, and molybdenum carbide nanodots in the compound growon a carbon material in situ. The composite material is prepared by adopting a method of combining dipping with heat treatment, the molybdenum carbide nanodots are uniformly distributed on the carbonmaterial, rich active sites are provided, and the method is mild in condition, low in cost and good in dispersity. The invention further provides a graphitized carbon foam supported carbon material / molybdenum carbide / sulfur composite positive electrode material, efficient adsorption and catalytic conversion of polysulfide are realized, and the shuttle effect of the polysulfide is effectively eliminated. The graphitized carbon foam supported carbon material / molybdenum carbide composite material provided by the invention has a wide application prospect in the aspect of novel high-capacity lithium-sulfur batteries, and can be further applied to the field of other related electronic devices.

The invention discloses a sorbitol dehydrogenase gene from pseudomonas syringae and application of the sorbitol dehydrogenase gene. The gene nucleic acid sequenc is shown as SEQ ID NO:1, a recombinant vector is built, cloning and expression are conducted in escherichia coli, and the sorbitol dehydrogenase amino acid sequence of the gene coding is shown as SEQ ID NO:2. The sorbitol dehydrogenase can effectively catalyze conversion of various important polyhydric alcohols and ketose corresponding to the polyhydric alcohols, the conversion rate to substrate of the sorbitol dehydrogenase is larger than 99%, compared with a traditional production method depending on isomerase, the later-period separation and decoloration costs are greatly lowered, and the sorbitol dehydrogenase gene has important industrial application value.

The invention belongs to the technical field of catalysts, and particularly relates to flaky manganese dioxide as well as a preparation method and application thereof. The invention provides flaky manganese dioxide. The crystal structure of the flaky manganese dioxide is a beta phase. In the present invention, the crystal form structure of the flaky manganese dioxide is a beta phase. Test resultsshow that the flaky manganese dioxide is used for simulating purification treatment of automobile tail gas, shows good catalytic performance as a catalyst for automobile tail gas purification and hasefficient catalytic conversion on NO at 150-400 DEG C. The flaky manganese dioxide has good denitration activity at a low-temperature section and a medium-high-temperature section.

The invention discloses an iron-based catalyst for preparing ethanol by CO2 hydrogenation, and a preparation method and application thereof. The active sites of the iron-based catalyst for preparing ethanol by CO2 hydrogenation comprise Fe5C2, Fe2C and Fe3C, and the mass ratio of Fe5C2 to Fe2C to Fe3C is (20-36): (7-12): (4-6). The invention also discloses the preparation method and application ofthe catalyst. In the process of preparing ethanol by CO2 hydrogenation, the catalyst has ethanol selectivity of more than or equal to 20% and CO selectivity of less than or equal to 10%; according tothe catalyst prepared by the preparation method of the iron-based catalyst for preparing ethanol by CO2 hydrogenation, the efficient synergistic effect of the auxiliary agent and the active metal iron oxide is realized; and the auxiliary agent effectively changes the reducibility of active metal iron oxide, efficiently regulates and controls the variety and proportion of the active metal iron-carbon compound of the catalyst, and further enhances the catalytic reactivity of the catalyst.

The invention discloses a nicotinamide ribose phosphate transferase mutant and application thereof. In the first aspect of the application, the nicotinamide ribose phosphate transferase mutant is provided, the nicotinamide ribose phosphate transferase mutant comprises an amino acid sequence obtained after an amino acid sequence shown as SEQ ID No.1 is mutated, and mutation comprises at least one of the facts that valine at the position 202 is mutated into alanine and leucine at the position 364 is mutated into proline. According to the embodiment of the invention, the nicotinamide ribose phosphate transferase at least has the following beneficial effects: compared with the existing nicotinamide ribose phosphate transferase, the nicotinamide ribose phosphate transferase provided by the embodiment of the invention has higher enzyme activity than the conventional wild type nicotinamide ribose phosphate transferase, and the substrate containing nicotinamide and 5-phosphoribose-1-pyrophosphoric acid can be efficiently catalytically converted into NMN.

The invention discloses a sorbitol dehydrogenase gene from pseudomonas syringae and application of the sorbitol dehydrogenase gene. The gene nucleic acid sequenc is shown as SEQ ID NO:1, a recombinant vector is built, cloning and expression are conducted in escherichia coli, and the sorbitol dehydrogenase amino acid sequence of the gene coding is shown as SEQ ID NO:2. The sorbitol dehydrogenase can effectively catalyze conversion of various important polyhydric alcohols and ketose corresponding to the polyhydric alcohols, the conversion rate to substrate of the sorbitol dehydrogenase is larger than 99%, compared with a traditional production method depending on isomerase, the later-period separation and decoloration costs are greatly lowered, and the sorbitol dehydrogenase gene has important industrial application value.

The invention discloses a catalyst for preparing higher alcohols from synthesis gas and a preparation method of the catalyst, and belongs to the technical field of catalysts. The preparation method ofthe catalyst provided by the invention comprises the following steps: (1) preparing an iron-based catalyst filter cake; (2) adjusting the solid content of the iron-based catalyst filter cake, addingmelamine, and pulping to obtain slurry; (3) subjecting the slurry to spray drying and roasting so as to obtain an iron-based catalyst precursor containing g-C3N4; and (4) carrying out reduction and nitridation treatment on the iron-based catalyst precursor containing g-C3N4 to obtain the catalyst. The active phase of the catalyst is iron nitride, the structure of the active phase is relatively single and easy to control, and the iron nitride has the characteristics of CO molecular adsorption and dissociated adsorption at the same time, and synthesis gas can be efficiently catalyzed and converted into higher alcohols.

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 present application discloses a mutant of nicotinamide phosphoribosyltransferase and its application. The first aspect of the present application provides a mutant of nicotinamide phosphoribosyltransferase, the mutant of nicotinamide phosphoribosyltransferase includes the mutated amino acid sequence of the amino acid sequence shown in SEQ ID No.1, and the mutation includes position 202 Valine is mutated to alanine, and the 364th leucine is mutated to proline at least one. The nicotinamide phosphoribosyltransferase according to the embodiment of the present application has at least the following beneficial effects: Compared with the existing nicotinamide phosphoribosyltransferase, the nicotinamide phosphoribosyltransferase provided in the embodiment of the present application is compared with the conventional wild-type The nicotinamide phosphoribosyltransferase has higher enzymatic activity and can efficiently catalyze the conversion of substrates containing nicotinamide and 5-phosphoribosyl-1-pyrophosphate into NMN.

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 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 kind of high-efficiency catalytic conversion of CO 2 The preparation method of the microbial coupling catalytic system comprises the following steps: drying the precursor of the iron-based active metal catalyst to remove water to obtain a solid A; dissolving the auxiliary salt in a solvent to obtain a solution B; immersing the solution B into the solid A The powder is stirred and dried to evaporate water to obtain solid C; the solid C is compressed to 20-40 mesh, and activated to obtain solid D; the solid D is ground to obtain catalyst E; the catalyst E and the domesticated anaerobic microorganism are Under anaerobic conditions, mechanical and physical mixing in a shaker is used to obtain efficient catalytic conversion of CO 2 microbial coupled catalytic system. The catalyst system obtained by coupling anaerobic microorganisms and iron-based catalysts in the preparation method of the invention can accelerate the conversion of inert CO by anaerobic microorganisms. 2 Efficient catalytic conversion into high value-added products such as methanol, formic acid or acetic acid, so as to achieve CO 2 efficient utilization of high value-added products.

The invention discloses an In 2.24 (NCN) 3 Catalytic nitrobenzene hydrogenation reduction prepares the method for aniline, and this method uses In 2.24 (NCN) 3 as catalyst, in H 2 Under the condition of 180-200 DEG C for 1-5 hours, the efficient catalytic reduction of nitrobenzene is realized, the conversion rate of nitrobenzene reaches 99.9%, and the selectivity of aniline reaches 99.8%. In which said In 2.24 (NCN) 3 The catalyst uses indium oxide, indium iodide, indium nitrate, and indium chloride as the indium source, and melamine and urea as the nitrogen source. Firstly, the indium source and the nitrogen source are fully mixed in the solvent, then evaporated to dryness, and roasted at high temperature And get. The preparation method of the catalyst used in the present invention has simple and safe operation steps, low cost, and a short preparation cycle. The catalyst is used in the reaction of nitrobenzene hydrogenation reduction to aniline, and realizes efficient catalytic conversion of nitrobenzene, and the structure of the catalyst It is stable and will not lose its activity after repeated recycling.

The invention discloses a CO 2 Iron-based catalyst, preparation method and application of hydrogenation ethanol, the CO 2 The active sites of iron-based catalysts for hydrogenation to ethanol include Fe 5 C 2 , Fe 2 C and Fe 3 C, and the Fe 5 C 2 :Fe 2 C:Fe 3 C mass ratio is 20‑36:7‑12:4‑6. The invention also discloses the preparation method and application of the catalyst. Catalyst of the present invention in CO 2 In the process of hydrogenation to ethanol, ethanol selectivity ≥ 20%, CO selectivity ≤ 10%; CO of the present invention 2 The catalyst prepared by the preparation method of iron-based catalyst for hydrogenation to ethanol realizes the efficient synergistic effect of the additive and the active metal iron oxide. The additive effectively changes the reduction performance of the active metal iron oxide, and efficiently regulates the catalyst's The type and ratio of the active metal iron-carbon compound, thereby improving the catalytic reactivity of the catalyst.

The invention provides a lithium-sulfur battery diaphragm, a preparation method thereof and a lithium-sulfur battery. The lithium-sulfur battery diaphragm comprises a diaphragm substrate and a diaphragm coating arranged on the surface of the diaphragm substrate, and the diaphragm coating comprises a Fe3O4 / carbon nanotube / carbon fiber compound. The lithium-sulfur battery diaphragm is prepared through a one-pot method and heat treatment, the preparation method is simple and low in cost, and the prepared lithium-sulfur battery diaphragm has good conductivity, can effectively adsorb lithium polysulfide, provides a large number of active sites, efficiently catalyzes conversion between lithium polysulfide and improves the cycling stability of a lithium-sulfur battery.