Catalyst for directly preparing dimethyl ether using carbon dioxide and use method thereof

Abstract

The invention discloses a bi-functional catalyst for directly preparing dimethyl ether by carbon dioxide, which is composed of a methanol synthesis active component and a methanol dehydration active component, and the core is to take a composite oxide Cu-Zn-Ti-Zr as the methanol synthesis active component, wherein, the content of CuO is between 10 and 90 percent, 30 to 70 percent preferred; the content of ZnO is 5 to 50 percent, 10 to 40 percent preferred; the molar ratio of Ti / Zr is 0.2 to 6, 0.4 to 4 preferred, the methanol dehydration active component is one or more than one mixture in molecular sieves of HZSM-5, HY, HBeta and HMCM-22, and the methanol synthesis active component and the methanol dehydration active component are mixed through a mechanical mixing method, an impregnation method, a coprecipitation method or a precipitation-deposition method, so as to obtain the catalyst. The prepared bi-functional catalyst has the advantages of high conversion of carbon dioxide and good dimethyl ether selectivity.

Description

technical field [0001] The invention relates to a catalyst for preparing dimethyl ether, in particular to a catalyst for directly preparing dimethyl ether from carbon dioxide. Background technique [0002] carbon dioxide (CO 2 ) is the most important greenhouse gas that causes global warming. In order to make atmospheric CO 2 In order to avoid catastrophic changes in the climate, in addition to taking measures to increase the efficiency of energy conversion and utilization, and to replace high-carbon fuels with low-carbon fuels or non-carbon fuels, the CO 2 Recycling and utilizing it has become a very important method. Among them, the relevant CO 2 The research on catalytic activation has been paid more and more attention by governments and researchers of various countries. On the other hand, with the continuous depletion of fossil resources such as coal, oil and natural gas, the prices of energy, chemical raw materials and products have risen rapidly, while CO 2 As a ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of low carbon dioxide conversion rate and / or poor selectivity of dimethyl ether in bifunctional catalysts used in the prior art for the synthesis of dimethyl ether, and to provide a catalyst with high Bifunctional catalysts with high carbon dioxide conversion and dimethyl ether selectivity

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