41results about How to "Enhanced adsorption and activation" patented technology

The invention provides a catalyst for synthesizing 1, 3-cyclohexanedimethylamine by hydrogenation of m-xylylenediamine and a preparation method thereof. The catalyst is composed of a carrier, and an active component and an auxiliary agent which are attached to the carrier; wherein the active component is composed of one or more of metals Rh, Pt, Pd, Ir, Au, Ag, Ni and Re and noble metal Ru; the auxiliary agent is composed of an auxiliary agent I and an auxiliary agent II, the auxiliary agent I is composed of metals Eu and Yb, the auxiliary agent II is selected from one or more of metals Li, Na, k, Cu, Co, Fe, Zn, Mn, La and Ce, and the carrier is a metal compound modified molecular sieve. Compared with the prior art, the catalyst can acquire a high raw material conversion rate and 1, 3-cyclohexanedimethylamine selectivity under low reaction temperature and pressure and high substrate concentration and reaction space velocity, is stable in performance and long in service life, can obviously improve the production efficiency and reduce the production cost, and is beneficial to industrial application.

The invention relates to a perovskite-type titanium-strontium-cobalt catalyst for hydrogen production by autothermal reforming of acetic acid and a preparation method. The catalyst with resistance tosintering, anti-carbon deposit, oxidation resistance and high activity is provided to aim at solving the problems that an existing catalyst has carbon deposits, sintering and oxidation of active components in the autothermal reforming process of acetic acid, and deactivation of the catalyst is caused. According to the perovskite-type titanium-strontium-cobalt catalyst for the hydrogen production by autothermal reforming of acetic acid and the preparation method, a sol-gel method is adopted to prepare the perovskite-type titanium-strontium-cobalt catalyst, and after calcination, a perovskite composite oxide catalyst Ti<1-x>Sr<x>CoO3 is obtained, wherein x=0-0.8. The perovskite structure facilitates the dispersion of an active component Co, strengthens the synergistic effect between the active component and a carrier, and inhibits the aggregation and growth of Co, thereby obtaining stable small-particle-size Co particles. In addition, Ti is partially replaced with Sr to increase the surface defect position and lattice defect structure of the perovskite-type catalyst, so that the carbon deposit resistance, oxidation resistance and thermal stability of the active component cobalt are improved, the diffusion of acetic acid, water vapor and oxygen is further facilitated, and the catalytic activity is increased.

The invention discloses a ferrous oxide-based ammonia synthesis catalyst. The ferrous oxide is taken as a main phase component, and potassium oxide, calcium oxide, aluminum oxide, magnesium oxide and other metal oxides are used as auxiliary catalysts. The ferrous oxide-based ammonia synthesis catalyst is prepared by a melting method. The catalyst has high activity to catalyze nitrogen and hydrogenate to synthesize ammonia, easy to reduce, and great in heat resistance and antitoxic and has mechanical performances. The catalyst is suitable to be used in various sizes of ammonia synthesizing devices, and particularly suitable for a low-pressure and low-energy consumption ammonia synthesizing technique; and obvious energy saving, consumption reduction, efficiency increasing, cost saving and economic benefits are achieved.

The invention relates to a method for photocatalytic dissolution of metal by using a phosphate radical modified photocatalyst. The method comprises the following steps that a metal-containing material to be dissolved is dispersed into a mixed solution containing a nitrile compound and an organic chloride, an inorganic phosphate radical modified photocatalyst is added, oxygen is introduced or a substance capable of generating oxygen is added, metal is dissolved under the condition of light irradiation, and after the metal is dissolved, a metal organic coordination compound is formed in the solution and has the general formula of (NH4) xMCly. Compared with the prior art, the preparation process of the photocatalyst is simple and convenient, after inorganic phosphate modification, oxygen adsorption can be improved, more superoxide free radicals are generated, visible light absorption of the catalyst can be improved so as to enhance the reaction rate of photocatalytic dissolution of metal, a feasible scheme is provided for actual production development, and the method has extremely high application value in the aspects of waste metal dissolution and recovery, photocatalytic oxidation reaction and the like.

The invention provides a catalyst with a double-alloy composite micro-mesoporous structure, a preparation method and application, the catalyst comprises a catalyst active component and a catalyst carrier, the catalyst active component comprises double alloys, the double alloys comprise a nickel-tin alloy and a nickel-lanthanum alloy, and the catalyst carrier comprises silicon dioxide with a micro-mesoporous structure; due to the existence of the double alloys, the electronic structure around active metal nickel particles can be effectively adjusted, adsorption and activation of methane and carbon dioxide are promoted, the activity of the catalyst is improved, and the carbon deposition resistance and the sintering resistance of the nickel particles are improved; through the silicon dioxidecatalyst carrier with the composite micro-mesoporous structure, the dispersity of active components of the catalyst can be improved, the sintering of nano nickel particles is inhibited, the carbon deposition phenomenon of the catalyst is reduced, and the activity and stability of the catalyst are improved.

The invention relates to the technical field of fine chemical engineering, in particular to a center-radial novel nickel-carbon catalytic material, the nickel-carbon catalytic material is a composite material obtained by uniformly dispersing Ni nanoparticles in an incompletely carbonized MOF framework, the external morphology of the nickel-carbon catalytic material is a hexagonal rod morphology, and the interior of the nickel-carbon catalytic material is of a center-radial structure; the nickel-carbon catalytic material is of a hierarchical pore structure, the specific surface area is 250-900 m < 2 >/g, and the pore volume is 0.7-1.05 cm < 3 >/g. The nickel-carbon catalytic material is large in specific surface area, has central radial internal pore channels, can provide more catalytic active sites for reactant molecules, and can promote efficient adsorption and activation of the reactant molecules, so that the selectivity of a target product is improved under mild conditions. Meanwhile, the invention provides a preparation method and application of the compound.

The invention discloses an iron-cobalt-potassium-loading zirconium dioxide catalyst and a preparation method thereof, and applications in preparation of ethylene through selective catalytic reductionof carbon dioxide. According to the method, a mixed solution of a Fe salt, a Co salt, a K salt and ZrO2 is subjected to a hydrothermal reaction at a temperature of 120-160 DEG C through a one-step hydrothermal method to obtain the iron-cobalt-potassium-loading zirconium dioxide catalyst. According to the iron-cobalt-potassium-loading zirconium dioxide catalyst of the invention, ZrO2 is used as a carrier so as to provide high surface oxygen vacancy, promote the conversion from CO2 to CO and increase the conversion rate of CO2; and through the synergistic promotion of iron-cobalt-potassium and zirconium dioxide, the catalyst has high catalytic activity, maintains good catalytic performance after continuous reaction is conducted for 250 h, and has high stability.

The invention relates to a porous ceramic supported cobalt-based Fischer-Tropsch catalyst as well as preparation and using methods thereof. The porous ceramic supported cobalt-based Fischer-Tropsch catalyst mainly aims at solving the problem that the catalyst is low in activity and selectivity at lower temperature in a process of preparing olefins by using synthetic gas. The problem is better solved by the technical scheme that a catalyst for preparing light olefins by using the synthetic gas, and the catalyst comprises the following components in percentage by weight: 20-80% of Co-containingactive ingredients (1) and 20-80% of large-surface porous ceramic carriers (2). The porous ceramic supported cobalt-based Fischer-Tropsch catalyst can realize industrial application to preparation oflight olefins by using the synthetic gas.

The invention relates to a catalyst for preparation of low-carbon olefin from synthesis gas as well as a preparation method and an application method of the catalyst and mainly aims at solving the problem that activity and selectivity of a catalyst are low at low temperature in a process of preparing the olefin from the synthesis gas. The catalyst for the preparation of the low-carbon olefin from the synthesis gas comprises the following components in percentage by weight: 20-80% of an active component and 20-80% of a carrier, wherein the carrier is at least one of SiO2 and Al2O3, the active component can be shown in the following general formula in an atomic ratio: Fe100AaBbKcOx, wherein A is at least one of Cu and Zn; B is Re; the value range of a is 5-50; the value range of b is 5-150; the value range of c is 0.1-5; and x is the total number of oxygen atoms required by valences of other elements. By adopting the technical scheme, the problem is relatively well solved, and the catalyst provided by the invention can be applied to the preparation of the low-carbon olefin from the synthesis gas.

Aiming at the problems that an existing catalyst is poor in stability and prone to inactivation in the acetic acid autothermal reforming hydrogen production process, the Ni/W-ZrO2 catalyst is prepared through sol-gel, and the Ni/W-ZrO2 composite oxide catalyst which is loaded by a monoclinic phase and tetragonal phase composite crystal phase t-ZrO2/m-ZrO2 and forms a Ni-W-Zr-O active center is obtained. The activity and the stability of the acetic acid autothermal reforming hydrogen production reaction are effectively improved. The molar composition of the catalyst in terms of oxide is (NiO) a (WO3) b (ZrO2) c, a is equal to 0.23-0.35, b is equal to 0-0.65 and not equal to 0, and c is equal to 0-0.77 and not equal to 0; the ceramic comprises the following components in percentage by weight: 15.0% of nickel oxide, 0-85.0% (not 0) of tungsten oxide and 0-85% (not 0) of zirconium oxide.

The invention relates to a samarium manganese mullite type nickel-based catalyst for hydrogen production by autothermal reforming of acetic acid. The invention provides a novel catalyst which is high in activity, resistant to carbon deposition and resistant to oxidation aiming at the inactivation problem of an existing catalyst in the autothermal reforming process of acetic acid. The chemical component of the catalyst is (NiO) a (SmMn2O5) b, a ranges from 0.107 to 0.281, and b ranges from 0.232 to 0.270. According to the preparation method, Ni species are loaded on a SmMn2O5 carrier by adopting an impregnation-precipitation method, and a novel catalyst which contains a stable NiMn2O4 spinel structure and has a Ni-Mn-Sm-O active center is formed through roasting. The catalyst provided by the invention effectively promotes the conversion of acetic acid, inhibits the generation of by-products such as acetone, and improves the yield and reaction stability of hydrogen.

The invention relates to a porous ceramic supported iron-based Fischer-Tropsch catalyst, a preparation method and a using method of the catalyst, and mainly solves the problem of low activity and selectivity of the catalysts at a low temperature for preparing olefin by using synthesis gas. In the method, a technical scheme of using a synthesis gas to prepare the low-carbon olefin catalyst is adopted to solve the problem well, wherein the catalyst comprises the following components in percentage by weight: (1) 20-80% of Fe contained active components, and (2) 20-80% of large-surface porous ceramic carriers. The catalyst can be used in industrial application of preparing low-carbon olefin by synthesis gas.