6results about How to "High dehydrogenation activity" patented technology

The invention discloses a cationic Pt single-site catalyst prepared through a Ce doping strategy, a preparation method of the cationic Pt single-site catalyst and application of the cationic Pt single-site catalyst in preparation of propylene through direct dehydrogenation of propane. The catalyst is formed by loading a ternary metal component consisting of Pt, Ce and M (any one of Fe, Zn, Ga and In) on the surface of SiO2 serving as a carrier, wherein Pt is in a single-site cationic state in the ternary metal component. The preparation method disclosed by the invention is simple to operate, process parameters are easy to control, the repeatability is good, and a cationic Pt delta + unit site in the obtained catalyst is chemically confined in a pore channel of SiO2 by a FeCe, ZnCe, GaCe or InCe nano island, so that more Pt delta + active sites can be efficiently exposed, and excellent and stable catalytic performance of preparing propylene by direct dehydrogenation of propane is realized.

The invention belongs to the technical field of catalysts, and particularly relates to a composite carrier dehydrogenation catalyst for preparing gamma-butyrolactone through dehydrogenation of 1, 4-butanediol as well as a preparation method and application of the composite carrier dehydrogenation catalyst. According to the composite carrier dehydrogenation catalyst disclosed by the invention, a Y-type molecular sieve / gamma-Al2O3 is used as a composite carrier, and an active component copper oxide is loaded on the composite carrier; wherein the mass ratio of the Y-type molecular sieve to the gamma-Al2O3 is (1-2): 1, the copper element content is 10%-20% according to the weight ratio of the composite carrier, and the zinc element content is 6%-10% according to the weight ratio of the composite carrier. By adopting a composite carrier structure, the dispersity and stability of active metals Cu and Zn are effectively enhanced. The composite carrier dehydrogenation catalyst prepared by the preparation method provided by the invention has the advantages of high catalytic activity, high selectivity and high stability.

A method for catalytically producing hydrogen from hydrocarbon raw materials and enriching CO2, wherein petroleum hydrocarbons are fed into a fluidized reactor, contacted with a catalyst containing a metal oxide to undergo a carbon-hydrogen bond decomposition reaction to generate hydrogen, and the reaction oil gas and the carbon-bearing catalyst obtained by the reaction are separated; the reaction oil gas is further separated into products containing hydrogen, CO, CO2, methane and other hydrocarbons; the carbon-bearing catalyst is first fed to a gasifier, contacted with water vapor for a high-temperature gasification reaction to generate hydrogen and carbon dioxide; the deactivated catalyst with a small amount of coke after gasification is fed to a regenerator to contact with water vapor and an oxygen-containing gas for a high-temperature gasification and carbonization reaction to be regenerated, the regenerated catalyst with the carbon burned off is returned to the fluidized reactor for recycling, and the regenerated flue gas is separated to obtain products containing hydrogen, CO and CO2. The present invention converts low-value hydrocarbon raw materials into hydrogen, realizes the high-value utilization of petroleum resources, and simultaneously realizes CO2 enrichment in the gasification and regeneration process, which is beneficial to carbon recovery and capture.

This invention relates to the field of organic synthesis technology, and discloses a copper-based catalyst, its preparation method, and a method for catalyzing the preparation of cyclododecanol from cyclododecanol into cyclododecanone. The preparation method of the copper-based catalyst includes the following steps: preparing a catalyst with a specific surface area of ​​200-250 m² / g. 2 / g Al2O3-SiO2 composite support; copper source and rare earth oxide additives were loaded onto the Al2O3-SiO2 composite support, dried and calcined to obtain catalyst precursor; the catalyst precursor was reduced to prepare Cu + A copper-based catalyst with a molar ratio of 1.8 to 2.5:1 to elemental copper. This invention can control the Cu content in the copper-based catalyst. + The molar ratio with elemental copper allows the catalyst's activity state to be adjusted according to different production needs, thereby enabling flexible control of the reaction rate, improving process adaptability and operational stability; at the same time, it helps to suppress side reactions and improve the selectivity and purity of cyclododecanone.

The invention discloses a non-noble metal bi-component composite molecular sieve catalyst as well as a preparation method and application thereof. The non-noble metal bi-component composite molecular sieve catalyst comprises a carrier and an active component loaded on the carrier, the active component comprises a first non-noble metal and a second non-noble metal; the first non-noble metal and the second non-noble metal are respectively and independently selected from one or more than two of cobalt, zinc, iron, lanthanum, yttrium, indium and gallium, and the first non-noble metal and the second non-noble metal are different; the carrier is a silicon-based molecular sieve. A silicon-based molecular sieve is used as a carrier, a non-noble metal bi-component active center is introduced, rich silicon hydroxyl on the surface of the molecular sieve is used for grafting the metal center, a porous structure of the molecular sieve is used for promoting metal dispersion and stability, a first non-noble metal component automatically captures a second non-noble metal component, and an electronic modulation effect between the bi-metal components is generated; through reasonable regulation and control of the metal center load proportion and reasonable optimization of reaction conditions, alkane can be effectively, efficiently and economically converted into olefin, and hydrogen as a byproduct can be produced at the same time.

The application belongs to the technical field of biocatalytic synthesis of steroid drugs, and particularly relates to a dehydrogenase, a gene, an engineering bacterium and application, the amino acid sequence of the dehydrogenase is SEQ ID NO. 1 or SEQ ID NO. 2, the dehydrogenase has high dehydrogenation activity, high stereoselectivity and strong regioselectivity, and no other conformation impurities are generated; the engineering bacterium can efficiently secrete the dehydrogenase, and effectively improves the conversion efficiency of a substrate, especially for a substrate 6-methy format (11beta, 17alpha-dihydroxy-6alpha-methylpregna-1, 4-diene-3, 20-diketone), which is low in cost and has significant industrialization potential; the dehydrogenase mutant has clear physicochemical properties, and the method of whole cell catalysis is used, so that the cumbersome step of enzyme purification is omitted, and the cost is reduced and the operation is simple.