Preparing method of high-performance catalyst for hydrogenation of carbon dioxide for synthesizing methyl alcohol

Abstract

The invention discloses a preparing method of a high-performance catalyst for hydrogenation of carbon dioxide for synthesizing methyl alcohol, belonging to the technical field of catalysts. The catalyst comprises mixed oxides of Cu, Zn and M, wherein M refers to Al, Nb, Mg or Zr; the molar ratio of CuO to ZnO to MxOy in the catalyst is 8 to 4-5 to 1-2; the preparing method comprises the following steps: performing parallel-flow precipitation on a saline solution containing active matters and a precipitator in a certain ratio to prepare an active component sizing agent A; performing parallel-flow precipitation on a saline solution containing carrier components and the precipitator to prepare a carrier sizing agent B; adding the sizing agent A to the sizing agent B, and violently beating; adding the saline solution containing the active matters and the precipitator in a certain ratio to prepare a catalyst sizing agent; and filtering, washing, drying and roasting to obtain the catalyst powder. The catalyst has a specific surface area as large as 160 m<2> / g, and is stable in structure, and the components are in close contact and achieve high synergistic effect, so that the catalyst has high activity and selectivity.

Description

technical field [0001] The invention relates to a preparation method of a high-performance carbon dioxide hydrogenation synthesis methanol catalyst, in particular to a catalyst for carbon dioxide hydrogenation synthesis methanol containing Cu, Zn active components and a carrier prepared by coprecipitation-deposition method, which belongs to the catalyst technology field. Background technique [0002] Methanol, as an extremely important basic chemical raw material, is a potential fuel for vehicles and fuel cells. In 1923, the German BASF company successfully synthesized methanol by high-pressure method. With the improvement of the performance of the catalyst, the new medium and low pressure methanol synthesis catalyst significantly reduces the equipment investment, reduces the production cost, improves the quality of methanol, and the methanol industry has achieved great development. [0003] CO 2 It is a greenhouse gas that deteriorates the atmosphere, and it is also a che...

AI Technical Summary

Problems solved by technology

[0007] Chinese patent CN101690894 A relates to a catalyst for synthesizing methanol with CO2 and H2, the catalyst is LaCr 1-xCuxO3, where x is the relative mole fraction of Cu as the main component, and the preparation process is to combine copper nitrate and chromium nitrate , lanthanum nitrate and citric acid to prepare an aqueous solution, form a sol under the irradiation of infrared lamps, heat and decompose nitrides and organic acids, and obtain it after roasting. The methanol selectivity of the catalyst reaches 60-90%, but CO2 conversion rate is only 3.0-10.4%