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

Abstract

The present invention discloses a catalyst used for preparing methanol by hydrogenation of carbon dioxide and a preparation method thereof, relating to a palladium-zinc catalyst which takes a carbon nanotube base material as an accelerating agent and a preparation method thereof; the catalyst contains main components of Pd and Zn and an accelerating agent of the carbon nanotube base material, the chemical formula is PdiZnj-x percent (CNT or y percent of Pd / CNT), and in the formula, i and j are mole ratio coefficients of relevant metallic elements in the main components of Pd-Zn, and x percent is masspercent of the accelerating agent of carbon nanotube base material in the catalyst; and the mass percentage of all the components is as follows: 2 percent to 25 percent of Pd, 55 percent to 90 percent of Zn and 6 percent to 20 percent of the accelerating agent of the carbon nanotube base material. During the preparation, the main components of Pd and Zn and the accelerating agent are coprecipitated and react and are dried and roasted so as to prepare the methanol. The activity of the catalyst is high and stable; the selectivity of the product of methanol is high; the conversion rate of hydrogenation of CO2 and space time yield of the methanol are obviously higher than the existing similar catalyst; the manufacturing is simple and convenient and the repetitiveness is good.

Description

technical field

[0001] The invention relates to a catalyst, especially a palladium-zinc catalyst promoted by carbon nanotube-based nanomaterials. Background technique

[0002] The greenhouse effect has been recognized as a serious threat to the environment of our planet, reducing CO, one of the major greenhouse gases 2 emissions have become a pressing issue. By hydroconversion, the CO 2 Processing into valuable fuels or chemicals is believed to currently fix large amounts of emitted CO 2 better handling method. In many CO 2 Among the possible products of hydrogenation, methanol has become the preferred target product because it is not only an important chemical raw material, but also a non-petroleum-based clean synthetic fuel.

[0003] The research and development of catalysts is the key to the practical application of carbon dioxide hydrogenation to methanol. 2 The catalyst for methanol hydrogenation is mainly CuO-ZnO (or CuO-ZrO 2 )-based catalyst [Koeppel RA, rt al...

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