Catalyst for preparing methanol by carbon dioxide hydrogenation and preparation method thereof

Abstract

The invention discloses a catalyst for preparing methanol by carbon dioxide hydrogenation and a preparation method thereof, and relates to a catalyst and a preparation method thereof; the catalyst takes copper nitrate, copper acetate or copper chloride as a copper source, and takes zinc nitrate and zinc acetate as a zinc source. Sodium carbonate, ammonium bicarbonate, ammonia water and urea are used as precipitants. The Cu-C3N4-M-ZnO catalyst is prepared by introducing graphite phase carbon nitride, simultaneously introducing transition metal chlorides and nitrates of VIII, IB and IIB groups of the periodic table of elements as cocatalysts, and adopting a coprecipitation method, a standing precipitation crystallization method and a solvothermal method. The preparation method of the catalyst comprises the following steps: an active component is complexed with a precipitant to obtain a precursor Cu-M-ZnO mother solution, C3N4 subjected to surface treatment is uniformly dispersed in the mother solution, self-assembly is performed through a standing precipitation crystallization method and a solvothermal method, and an active center grows along the surface of the C3N4 to obtain the Cu-C3N4-M-ZnO catalyst with a spongy porous structure. The catalyst comprises: 10 to 30 percent of Cu, 0.005 to 5 percent of cocatalyst M, 10 to 30 percent of C3N4 and the balance of active ZnO, and thecatalyst has good industrial application prospect.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for hydrogenation of carbon dioxide to methanol and a preparation method thereof. Background technique [0002] In recent years, global warming due to the greenhouse effect has attracted widespread attention. Global warming has caused a series of problems such as the melting of icebergs, permafrost and glaciers, frequent occurrence of extreme weather, and extinction of species. These problems have seriously threatened the survival of human beings and other species. According to the report of the United Nations Intergovernmental Panel on Climate Change (IPCC), among the types of gases that cause the greenhouse effect, CO 2 The resulting greenhouse effect accounts for about 60%. According to statistics, my country's CO 2 China's emissions have jumped to the second place in the world. my country is in a period of rapid industrial development. The governmen...

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Problems solved by technology

[0016] Due to CO 2 The inertness and thermodynamic unfavorable factors make it difficult to activate and reduce carbon dioxide. The catalysts prepared by traditional methods such as impregnation and co-precipitation have shortcomings such as low conversion rate, many by-products and low selectivity of methanol. Therefore, new catalysts and catalysts are studied. Catalyst preparation method, it is very important to improve the reactivity and selectivity of the catalyst to optimize the utilization of carbon dioxide resources