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

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 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 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.