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

The invention relates to a catalyst for synthesizing light olefins as well as a preparation method and a using method of the catalyst, aiming at solving the problems that the catalyst has low activity and low selectivity at low temperature when preparing olefins by use of synthesis gas. The catalyst for preparing light olefins by use of synthesis gas is prepared from the following components in percentage by weight: (1) 20-80% of active component; and (2) 20-80% of carrier selected from at least one of SiO2 or Al2O3, wherein the general formula of the active component is as follows according to the atomic ratio: Fe100AaBbKcOx, A is selected from at least one of Ag or Au, B is selected from W, the range of a is 5-50, the range of b is 5-150, the range of c is 0.1-5, and x is the total number of the oxygen atoms required for meeting valences of other elements. The catalyst can solve the problems well and can be used for industrial production for preparing light olefins by use of synthesis gas.

A stable and efficient method for preparing aromatic amines by catalytic hydrogenation. The aromatic amines are prepared by catalytic hydrogenation of aromatic nitro compounds. In the method, a stabilizer is added to the reaction solvent. In the presence of the stabilizer, aromatic nitro compounds and The aromatic amine is obtained by catalytic hydrogenation reaction of hydrogen under the action of a catalyst. In the invention, a stabilizer is added in the preparation process, which effectively solves the problem of performance degradation of the hydrogenation catalyst caused by impurities contained in raw materials, and improves catalyst stability and product yield.

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 praseodymium-zirconium composite oxide cobalt-based catalyst for producing hydrogen by autothermal reforming of acetic acid. Aiming at the deactivation problems such as the change of catalyst structure, sintering and carbon deposition in the existing catalyst in the autothermal reforming reaction of acetic acid, the present invention adopts the sol-gel method to prepare Co 3 o 4 and Pr-doped t‑ZrO 2 The Zr-Pr-O composite oxide cobalt-based catalyst limits the aggregation of active components and the growth of grains, and significantly improves the catalyst's anti-coking, anti-sintering ability and hydrogen production rate. Catalyst chemical composition of the present invention is (PrO 1.5 ) a (ZrO 2 ) b (CoO 1.5 ) c , where a is 0‑0.19 and not 0, b is 0.43‑0.69, and c is 0.17‑0.21.

The invention relates to a nickel-based Fischer-Tropsch catalyst and a preparation method and application method thereof, and mainly solves the problem that a catalyst for preparation of alkene from synthetic gases has low activity and selectivity at a low temperature. According to the invention, a technical scheme is adopted, wherein a catalyst is adopted for preparation of low-carbon alkene fromthe synthesis gases, and the catalyst comprises the following components of: by weight, (1) 20-80% of Ni-containing active components and (2) 20-80% of nanometer fiber SiO2 carrier; through the technical scheme, the problem is solved well, and the Ni-based Fischer-Tropsch catalyst and the preparation method and application method thereof can be applied to industrial application for preparation ofthe low-carbon alkene from the synthesis gases.

The invention relates to a cobalt based fischer-tropsch catalyst, and a preparation method and an application method thereof. The invention is mainly to solve the problems of low activity and selectivity of a catalyst at a low temperature in preparation of olefin from synthesis gas. According to the invention, the catalyst used for preparation of light olefin from synthesis gas comprises the following components in terms of the weight percentage of the catalyst: (1) 20 to 80% of a Co containing active component; and (2) 20 to 80% of a nanofiber SiO2 carrier. Thus, the technical scheme well solves the above-mentioned problems and can be used for industrial application in preparation of light olefin from synthesis gas.

The invention relates to a catalyst taking cobalt partially substituted cerium dioxide as an active center, which is used for preparing hydrogen by autothermal reforming of acetic acid. Aiming at theproblem of inactivation of an existing catalyst in an acetic acid autothermal reforming reaction, the invention provides a novel catalyst which is stable in structure, resistant to carbon deposition and resistant to oxidation. The chemical composition of the catalyst of the invention is (CoO1.5) a (CeO2) b, wherein a is 0-14.4 and does not contain 0, and b is 16.2-23.2 and does not contain 23.2. According to the invention, a two-step hydrothermal method is adopted to prepare the micro-spherical mesoporous structural material; a cobalt-partially-substituted CeO2 active center is formed after hydrogen reduction, acetic acid molecules are efficiently converted, adsorption activation on water and oxygen is improved, gasification of a carbon deposition precursor is promoted, generation of a by-product acetone is reduced, and carbon deposition resistance and oxidation resistance of the catalyst are improved.