Catalyst for methanol synthesis via CO2 hydrogenation on slurry bed reactor, preparation method and application

Abstract

The invention provides a catalyst for methanol synthesis via CO2 hydrogenation on a slurry bed reaction. The catalyst comprises the following components in percentage by weight: 30%-50% of CuO, 15%-30% of ZnO, 10%-25% of Al2O3, 2%-10% of transition metal oxides and 5%-40% of structural promoters. The catalyst has the advantages that the degree of sphericity of particles is high, the particles are distributed uniformly, the specific surface area is large, the wear resistance is high, the service life is long, the performance of the catalyst is stable in CO2 hydrogenation reaction, low-temperature activity, transformation activity and selectivity are high, the catalyst can be operated at low temperature ranging from 180-220 DEG C, the cost is low, and the catalyst is easy and convenient to prepare and can be industrially amplified easily. The CO2 single-pass conversion rate of the catalyst can be high at the temperature of 220 DEG C, and the wear resistance of the catalyst is quite high.

Description

technical field [0001] The present invention relates to a kind of catalyst and its preparation method and application, particularly relate to a kind of catalyst for slurry bed CO 2 Catalyst for synthesizing methanol by hydrogenation, preparation method and application. Background technique [0002] Atmospheric CO 2 The greenhouse effect caused by the increase in concentration and the scarcity of fossil fuels are attracting worldwide attention. will CO 2 Conversion to methanol is an effective approach that is expected to solve the two major problems of greenhouse gas emissions and fossil fuel substitution, because the product methanol is both a raw material for many important chemicals and a non-petroleum-based clean synthetic fuel. Compared with the traditional syngas to methanol process, CO 2 There are fewer by-products in the process of hydrogenation to methanol, which is beneficial to the further chemical conversion of methanol. CO 2 Is one of the most stable compou...

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Problems solved by technology

However, the catalyst of this system is formed by grinding method. Although the required particle size range can also be achieved, the particles of the catalyst generally have irregular shapes, poor mechanical strength and wear resistance, and short service life.

Patents 200910074119.2 and 201310132895.X are formed by spray drying. Spray drying has the function of drying and forming at the same time, eliminating the need to grind the material after conventional drying. The catalyst prepared by spray drying is not only particle size Small and uniform, and the prepared catalyst particles are spherical, with good fluidity and wear resistance, especially suitable for use in a slurry bed, but the methanol synthesis catalysts mentioned in the patent are all for CO, CO 2 、H 2 Syngas development, and no mention of catalyst attrition performance in slurry bed reactors

Dragomir B. Bukur (Applied Catalysis A: General, 2010, 388, 240-247) and patent 200910133993.9 mentioned through SiO 2 The addition of can significantly improve the anti-wear performance of the catalyst, but only for the Fischer-Tropsch synthesis reaction

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