Catalyst for synthesizing methanol by hydrogenating carbon dioxide and preparation method thereof

Abstract

The invention relates to a catalyst for synthesizing methanol by hydrogenating carbon dioxide and a preparation method thereof, belonging to the technical field of catalysts. The catalyst for synthesizing the methanol by hydrogenating the carbon dioxide comprises a mixed oxide of one or more of Cu, Zn, La, Ce and M, wherein M is Al, Si, Ti or Zr; the catalyst comprises the following components in percentage by weight: 30-70% of CuO, 10-40% of ZnO, 1-5% of accelerative activators Ln2O3, 1-5% of stabilizers CeO2 and 5-20% of carrier oxides MxOy. The preparation method of the catalyst comprises the following steps of: firstly mashing the carrier oxides MxOy; and then adding active matter components and precipitators into oxide slurry in a parallel flowing manner for coprecipitation. The catalyst disclosed by the invention has the advantages of high specific surface reaching 200 m<2> / g, stable structure, contact compactness among all the components and high synergistic effect, so that the catalyst has higher activity and selectivity; the preparation process of the catalyst has the advantages of simplicity, good repeatability and convenience for industrial production; in addition, by means of the catalyst disclosed by the invention, the conversion rate of the carbon dioxide is high and reaches 35 percent under appropriate reaction conditions, and the selectivity of the methanol is higher and reaches more than 80 percent.

Description

technical field [0001] The present invention relates to a kind of carbon dioxide hydrogenation synthesis methanol catalyst and preparation method thereof, specifically, adopt the method of co-precipitation-deposition to prepare the catalyst containing Cu, Zn active component and La 2 o 3 , CeO 2 The additive is used as a catalyst for carbon dioxide hydrogenation to methanol. It belongs to the technical field of catalysts. Background technique [0002] Methanol is an extremely important basic chemical raw material, as well as a potential vehicle fuel and fuel cell fuel. Since the successful synthesis of methanol by the high-pressure method of the German BASF company in 1923, with the improvement of catalyst performance, the new medium and low pressure With the emergence of synthetic methanol catalysts, equipment investment has decreased significantly, production costs have decreased, methanol quality has improved, and the methanol industry has achieved tremendous developme...

AI Technical Summary

Problems solved by technology

[0007] Chinese patent CN101690894A relates to a CO 2 and H 2 Catalyst for synthesizing methanol, the catalyst is LaCr 1-x Cu x o 3 , where x is the relative mole fraction of Cu as the main component. The preparation process is to prepare an aqueous solution of copper nitrate, chromium nitrate, lanthanum nitrate and citric acid, form a sol under the irradiation of infrared lamps, and heat to decompose nitrides and organic acids. Prepared by calcination, the methanol selectivity of the catalyst reaches 60-90%, but CO 2 The conversion rate of only 3.0-10.4%