8results about How to "Good dehydrogenation performance" patented technology

The invention belongs to the technical field of hydrogen storage materials, and particularly relates to a preparation method of a light-driven magnesium-based composite hydrogen storage material, which comprises the following steps: mixing and grinding strontium titanate and sodium borohydride in a mortar; then, heating and calcining the mixture in a tubular furnace in an argon atmosphere, and carrying out surface modification treatment; then, washing the calcined product, and performing vacuum drying to obtain STO-450 particles with reconstructed surfaces; mgH2 and STO-450 particles are mixed through a high-energy ball milling method, the MgH2-Y wt.% STO-450 composite hydrogen storage material is prepared, and Y is the mass fraction of the STO-450 particles in the composite hydrogen storage material. The temperature rising rate of the prepared light-driven magnesium-based composite hydrogen storage material is greatly increased, efficient solar photo-thermal conversion is achieved, the energy utilization rate is high, and the dehydrogenation amount is increased by nearly two times compared with that of a common strontium titanate composite hydrogen storage material.

The application belongs to the field of chemical catalysis technology, and specifically discloses application of a rare earth metal doped modified white clay mesoporous composite material as an ethanol dehydrogenation catalyst carrier. The preparation method of the rare earth metal doped modified white clay mesoporous composite material comprises the following steps: after alkali modification of active white clay powder, the active white clay powder is dispersed in silica sol, an aqueous solution of a rare earth metal salt is added dropwise, and then hydrothermal crystallization treatment and calcination treatment are performed to obtain the rare earth metal doped modified white clay mesoporous composite material. The modified white clay-mesoporous silica composite substrate is selected, and the rare earth metal is chemically bonded to the interface of the composite substrate to form an inlaid cross-linked multi-level pore network, thereby breaking through the limitation of a conventional porous carrier that relies on physical adsorption to load active metals. The prepared ethanol dehydrogenation catalyst reduces carbon deposition by virtue of the rare earth interface modification, greatly delays the rapid deactivation rate of the catalyst, significantly enhances the operation stability of the catalyst and prolongs the service life, and meets the needs of industrial continuous production.

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.

The application discloses a gradient electron regulation type noble metal-transition metal bifunctional catalyst and a preparation method and application thereof, and comprises active metal components A, auxiliary active metal components B, oxide carriers C and surface electron regulation components D. In the application, the noble metal is enriched on the outer layer of the carrier, directly participates in the surface catalytic reaction, the catalytic efficiency of unit mass noble metal is significantly improved, and excellent hydrogenation and dehydrogenation performance can be realized. The inner layer transition metal promotes hydrogen overflow and hydrogenation activity, the outer layer noble metal provides efficient dehydrogenation sites, and the two realize ordered division and cooperation in space through the gradient distribution structure, thereby solving the problem of disordered distribution of traditional two metals and insufficient cooperation effect. The gradient distribution structure reduces the migration and agglomeration tendency of metal particles in high-temperature circulation, the oxygen vacancies and basic sites of the oxide carrier inhibit carbon deposition, and the catalyst can maintain high activity and stability in multiple hydrogenation-dehydrogenation cycles, and the cycle life is significantly better than that of a conventional co-impregnated bimetallic catalyst.

This invention discloses a catalyst for the production of ethylene and propylene, its preparation method, and its applications. The catalyst comprises the following components: I) 1%–10% of chemical formula A x B y D z A compound of O4; in the chemical formula, the oxidation states of elements A, B, and D are m, n, and p, respectively, satisfying x·m + y·n + z·p = 8, where m, n, and p are integers not greater than 3; the A x B y D z O4 has a spinel structure; II) 0.5%–10% is selected from at least one oxide of rare earth elements, P, Mo, and W; III) 20.0%–55.0% is selected from at least one zeolite of ZSM-5 and ZSM-11; IV) 10%–30% is a binder; V) 25.0%–60.0% is clay. This catalyst is used in the catalytic cracking of petroleum hydrocarbons to produce ethylene and propylene, and features good catalyst stability, low methane yield, and high ethylene and propylene yields.

The invention is suitable for the technical field of organic liquid dehydrogenation, and provides a preparation method and application of a bimetallic catalyst for organic liquid dehydrogenation, and the method comprises the following steps: preparing a nickel-tin salt solution as an impregnation liquid according to the saturated water absorption capacity of a carrier and an impregnation method, and mixing and stirring the carrier and the impregnation liquid; stirring, draining, aging and drying to obtain a catalyst precursor; roasting the catalyst precursor to obtain a bimetallic catalyst; and placing the bimetallic catalyst in a reduction gas flow to carry out a reduction reaction for later use. The metal components in the prepared bimetallic catalyst are uniformly dispersed, and the synergism among different metals is good; the non-noble metal catalyst can be used for dehydrogenation reaction of dibenzyltoluene hydrogen storage liquid, has excellent dehydrogenation performance, and can reduce carbon deposition in the reaction process and reduce loss of dehydrogenation raw materials. In addition, the non-noble metal catalyst prepared by the method avoids using expensive noble metal materials, so that the cost of an organic liquid dehydrogenation catalyst is remarkably reduced.

The utility model discloses a crude helium dehydrogenation device, relates to the technical field of helium purification, and aims to solve the problems of higher dehydrogenation cost and poorer dehydrogenation effect. The crude helium dehydrogenation device comprises a mixer, a first-stage reactor, a first-stage cooler, a first-stage gas-liquid separator and a second-stage reactor; a gas inlet of the mixer is used for being communicated with an oxygen-containing gas source and a feed gas source, a gas outlet of the mixer is communicated with a gas inlet of the first-stage reactor, a gas outlet of the first-stage reactor is communicated with a gas inlet of the first-stage cooler, a gas outlet of the first-stage cooler is communicated with a gas inlet of the first-stage gas-liquid separator, and a gas outlet of the first-stage gas-liquid separator is communicated a gas outlet of the primary gas-liquid separator is communicated with a gas inlet of the secondary reactor; the gas outlet of the primary gas-liquid separator is also communicated with the gas inlet of the mixer; the gas outlet of the first-stage reactor is also communicated with the gas inlet of the second-stage reactor. The crude helium dehydrogenation device provided by the utility model is used for improving the dehydrogenation effect and reducing the production cost.

The present invention provides a core-shell Co-based all-silicon molecular sieve catalyst, wherein the active component is Co and the carrier is Silicalite-1 molecular sieve; the CoO synthesized by the present invention x @Silicalite‑1 molecular sieve catalyst can regulate CoO x The particle size is small and sintering is inhibited during the reaction, while the interaction with the carrier Silicliate-1 is enhanced, thereby showing better propane dehydrogenation catalytic performance and propylene selectivity; the present invention adopts a method of first impregnation and then hydrothermal to synthesize efficient and stable core-shell CoO x @Silicalite‑1 molecular sieve propane dehydrogenation catalyst is more conducive to the active species CoO compared with the one-step hydrothermal synthesis method. x During the synthesis process, it is confined in the framework structure of the Silicalite-1 molecular sieve, making the active sites highly dispersed, reducing the deep dehydrogenation of propylene at the active sites and inhibiting the occurrence of side reactions such as carbon deposition, and has good stability.