54results about How to "Promote dehydrogenation" patented technology

A method and system for storing and evolving hydrogen employ chemical compounds that can be hydrogenated to store hydrogen and dehydrogenated to evolve hydrogen. A catalyst lowers the energy required for storing and evolving hydrogen. The method and system can provide hydrogen for devices that consume hydrogen as fuel.

The invention provides a carbon material film with high electric conductivity, heat conductivity and strength and a preparing method thereof. The carbon material film is prepared according to the steps of adding functional carbon material powder and a dispersant to a solvent to be mixed and stirred; adding a binder and a plasticizer, and conducting mixing to obtain uniform and stable slurry; forming a blank film; placing the blank film in the solvent for reaction; evaporating the solvent; increasing temperature to 1000-3000 DEG C for sintering lasting 1-10 h to obtain the carbon material film. Through functional modification and then tape-casting and sintering of the surface of the carbon material, active groups between different sheets of the carbon material react with one another to form chemical bonds, and a carbon net stable structure is formed finally so that different sheets of the carbon material can be connected in the true sense. In this way, the mechanical strength, electric conductivity and heat conductivity of the carbon material film are improved greatly.

The invention discloses a high-performance sulfenyl composite anode material and a preparation method thereof. The composite material is formed by compounding a conductive polymer with M-doped sulfur,and is xP.{(1-x)[yM.(1-y)S]} particularly, wherein P stands for the conductive polymer, S is sulfur, M is one or two of Se and Te, x and (1-x) are separately the mass percent of the conductive polymer and the mass percent of the M-doped sulfur, y and (1-y) are separately the mass percent of M in the M-doped sulfur and the mass percent of sulfur, 0<x<1, and 0<y<1. The high-performance sulfenyl composite anode material can be obtained by modifying and further optimizing various components in the sulfenyl composite anode material and the corresponding ratios, the corresponding preparation methods and the like, and the problems that in the prior art, the electrical conductivity is low, and the activity of an electrode is low and the cycle life is poor due to solubility and diffusion of polysulfide are solved.

The invention discloses a nano porous crystalline material {[Cu (HTCPZ) 0.5]} infinity and a preparation method thereof. The preparation method of the nano porous crystalline material is characterized in that: 3-(4-tetrazole-phenyl) amine and copper chloride are subjected to solvothermal synthesis according to a molar ratio of 1:(3-15) at a temperature of 80-180 DEG C; the molecular formula of the obtained Cu-based microporous crystalline material is {[Cu (HTCPZ) 0.5]} infinity, wherein HTCPZ is 3-(4-tetrazole-phenyl) amine which is a tridentate ligand having the following molecular structure shown in the accompany drawing; and the porous crystalline material is a hexagonal system crystalline material, the space group is P6122, the size range of a pore canal is 1-1.2nm, and the inner surface of the pore canal contains a coordinatively unsaturated surface of metal Cu. The preparation method provided by the invention has the advantages of simpleness, mild reaction conditions, high yield and high purity of products. The porous crystalline material prepared by the invention has the advantages of uniform pore canal, nanopore size, and metal center immobilizing.

The invention discloses a high-strength low-abrasion abrasion-resisting ball used for a ball mill and a preparation method of the high-strength low-abrasion abrasion-resisting ball. The high-strengthlow-abrasion abrasion-resisting ball used for the ball mill comprises a cladding layer and an abrasion-resisting ball base body, and the abrasion-resisting ball base body comprises the following components of C, B, Ti, Mg, Si, W, Cr, Mn, Ni, V, Zr, Nb, Mo, Ce, Nd, Sm, Er and the balance Fe and inevitable impurities. According to the high-strength low-abrasion abrasion-resisting ball used for the ball mill and the preparation method of the high-strength low-abrasion abrasion-resisting ball, through optimization of the matching ratio and a preparation technology, the high-strength low-abrasion abrasion-resisting ball has the advantages of being large in impact toughness, good in corrosion resistance, large in strength, small in abrasion and the like, and the working efficiency of the abrasion-resisting ball is effectively improved.

The invention discloses a preparation method of a catalyst for high efficient catalytic degradation of harmful gas PH3. According to the preparation method, low cost natural halloysite nano tubes (HNTs) are taken as the carrier; nickel chloride, ferric chloride, and ferrous sulfate are taken as the precursors; based on a chemical plating technology, and a nickel nano clad layer is plated on the halloysite nano tubes (HNTs) to form a one-dimensional shell/core structure. Then through a co-precipitation method, Fe3O4 nano particles are loaded on the nickel clad layer surface in a dotted mode toform a one dimensional shell/dual core structure. The preparation method has the advantages that there is no severe requirement on physical conditions, the method is simple, the price of HNTs is low,and the efficiency of using the catalyst to degrade PH3 catalytically is high, and the service life is long.

The invention discloses a preparation method of ultra-pure G102Cr18Mo stainless bearing steel, and belongs to the technical field of metal smelting. According to the method, firstly, base metal needed for preparing the ultra-pure G102Cr18Mo stainless bearing steel is obtained through intermediate frequency furnace smelting, LF furnace refining, sedation treatment and die casting, the oxygen content ranges from 20 ppm to 30 ppm, and conditions are created for ultra-pure stainless steel bearing steel smelting; then, the base metal is subjected to forging and scaling treatment and then is put into a vacuum induction furnace to be melted and refined, and no alloy element is added in the vacuum induction treatment process; a consumable electrode subjected to vacuum induction melting is subjected to vacuum consumable remelting twice, and the G102Cr18Mo stainless bearing steel with extremely high purity can be obtained.

The invention relates to a combined reactor for preparing olefin by alkane dehydrogenation and hydrocarbon catalytic cracking. The reactor for preparing olefin by catalytic dehydrogenation-cracking ofalkane comprises a catalytic dehydrogenation-cracking reactor and a reactor settling section, the reactor settling section is located at the upper part of the reactor, the reactor comprises a dehydrogenation reaction section and a cracking reaction section, the dehydrogenation reaction section is located below the cracking reaction section, and one end of a catalyst regeneration inclined pipe isconnected with the dehydrogenation reaction section. The method is beneficial to dehydrogenation reaction and catalytic cracking reaction.

The invention discloses a method for growing graphene on a silicon substrate by using PEALD. The clean silicon substrate is placed in a reaction chamber for carrying out PEALD cycles, and each cycle comprises the following steps: (1) carrying out adsorption of a carbon source or an auxiliary source, wherein the carbon source is selected from at least one of benzene series and methane, and the auxiliary source is an oxygen-containing organic matter; (2) cleaning the adsorbed silicon substrate, and carrying out plasma pulse; and (3) cleaning the silicon substrate after plasma pulse. According tothe method, graphene can be grown on the silicon substrate in a large area, and has good compatibility with a current silicon-based semiconductor technology. According to the method, growth is promoted by using oxygen-containing small molecules, on one hand, vacancy-type defects are compensated by taking graphene as small molecular carbon, the D peak of a defect peak after the reaction is reduced, on the other hand, the participation of oxygen element promotes a dehydrogenation process of benzene in the growth process, the size of wrinkles after film formation is reduced, and the quality of large-area grown graphene through atomic layer deposition and growth on the silicon substrate is improved.

The invention relates to a nickel-magnesium-chromium mesoporous composite oxide catalyst for auto-thermal reforming of acetic acid to produce hydrogen. The invention aims to solve the problem that inthe prior art, during the acetic acid auto-thermal reforming process, the structure of a conventional catalyst changes, the active components are oxidized and sintered, and thus the catalyst is deactivated, and provides a novel catalyst having the advantages of stable structure, sintering resistance, carbon deposition resistance, oxidation resistance and high activity. The chemical formula of thecatalyst is (NiO)a(MgO)b(CrO1.5)c; wherein a is 0.08-0.12, b is 0.55-0.92, c is 0-0.33, and nickel oxide accounts for 12.0 to 20.0 wt.% of the catalyst, magnesium oxide accounts for 40.0 to 88.0 wt.%of the catalyst, and chromium oxide accounts for 0 to 40.0 wt.% of the catalyst. A catalyst precursor is prepared by a co-precipitation method, chromium is introduced into the catalyst and is taken asan auxiliary agent; after burning, a stable mesoporous composite oxide catalyst, which comprises a MgCr2O4 and NiCr2O4 spinel structure and a Mg-Ni-Cr-O solid solution, is formed; the reducing performance and stability of the active components are enhanced; at the same time, the hydrogen yield of acetic acid auto-thermal reforming, sintering resistant performance, and carbon deposition resistantperformance are all strengthened.

The invention relates to a preparation method of tetraene intermediates. According to the preparation method, a first compound is converted by Nocardioides simplex to obtain tetraene intermediates; wherein the first compound is represented by a formula I, tetraene intermediates are represented by a formula II, and R in the formula I and the formula II represents H, a halogen atom, an alkyl group,an alkoxyl group, a hydroxyl group, or a phenyl group. According to the preparation method, the first compound is taken as the substrate, only Nocardioides simplex is used to carry out biological conversion; the substrate is subjected to 1,2-dehydrogenation and 21-acetate hydrolysis at the same time; most of the conversion products is target products, the byproduct ratio is low; after purification, the product is white or white-like crystals; relative to the weight of the substrate, the yield is 80-90%; the target product yield is high; through HPLC analysis, the purify of the product is not less than 95%; and the total content of target products and secondary products is not less than 99%.

The invention provides a preparation method of a gasification slag magnesium-nickel alloy hydrogen storage composite material. The method is characterized in that after magnesium powder, nickel powderand gasification slag are mixed, by means of a porous structure of the gasification slag, pore channels of the gasification slag are filled with the magnesium powder and the nickel powder through ball milling, ultrasonic vibration and other modes, and a mixture is uniformly mixed; and then through pressing, sintering and cooling, the gasification slag magnesium-nickel alloy hydrogen storage composite material is prepared. When the composite material is used for hydrogen storage, the porous gasification slag serving as a catalyst is distributed in a magnesium-nickel alloy matrix, so that alloyhydrogenation and hydride dehydrogenation can be promoted, alloy hydrogen collection and hydrogen desorption speed can be increased, and the activation energy of a hydrogen storage system can be reduced; and fine magnesium-nickel alloy particles are distributed in the gasification slag pore channels, so that the growth, caused by heating in a hydrogen desorption process, of the magnesium-nickel alloy particles can be effectively inhibited, and then the hydrogen storage cycle stability of the composite material is maintained. The preparation method is low in cost and wide in raw material source, has the effects of solid waste gasification slag treatment, and reclamation and higher value application of the gasification slag at the same time, and is remarkable in advantage and suitable for popularization.

The invention provides a liquid chromatography-DAD-tandem mass spectrometry method for simultaneously detecting four enantiomers in cyfluthrin and application of the liquid chromatography-DAD-tandem mass spectrometry method, and the method comprises the following steps: dissolving a sample to be detected in chromatographic grade absolute ethyl alcohol to obtain a detection solution, and detecting the detection solution by adopting a liquid chromatography-DAD-tandem mass spectrometry technology, wherein the liquid chromatography adopts reversed-phase liquid chromatography, the mobile phase is a water-free alcohol solution, and the mass spectrum adopts a DAD-ultraviolet detector. According to the method, absolute ethyl alcohol is selected as the mobile phase, so that the maximum separation effect of four enantiomers can be ensured, and the requirement that a chiral chromatographic column cannot use any water phase system can be met; 0.2-0.45 v% of ammonia water is added into the mobile phase, so that the cyfluthrin is ionized, and the detection sensitivity is improved; and according to the method, a DAD-ultraviolet detector is matched, so that the mass spectrum response of the method is improved, parameters such as collision energy are optimized, and quantitative analysis of four enantiomers of the cyfluthrin is realized.

The invention discloses a dehydrogenation catalyst which comprises modified aluminum oxide as a carrier, Pt as an active component and Ga-containing perovskite as aids, wherein the mass percentage content of Pt in the dehydrogenation catalyst is 0.1-0.5%, and the mass percentage of Ga is 0.4-3.1%. The invention further provides a method for preparing the dehydrogenation catalyst and the application of the dehydrogenation catalyst in alkane dehydrogenation to prepare olefin. The catalyst is simple in preparation method, and the dehydrogenation catalyst prepared by using the preparation method has high catalysis performance in alkane dehydrogenation. The dehydrogenation catalyst disclosed by the invention has the characteristics of being high in activity, good in carbon prevention and good in stability, and the preparation method is simple and easy to achieve, and has a wide application prospect.

Processes for reforming a hydrocarbon feedstock by selectively reforming different sub-components or fractions of the feedstock using at least two compositionally-distinct reforming catalysts. Advantages may include a decreased rate of reforming catalyst deactivation and an increased yield of a liquid hydrocarbon reformate product that is characterized by at least one of an increased octane rating and a decreased vapor pressure (relative to conventional one-step reforming processes and systems).