Preparation method of alkaline earth metal modified CO2 hydrogenation catalyst

Abstract

The embodiment of the invention provides a preparation method of an alkaline earth metal modified CO2 hydrogenation catalyst, the CO2 hydrogenation catalyst is CuO-ZnO / ZrO2, the preparation method comprises the following steps: according to a certain proportion, respectively dissolving salt solutions corresponding to copper, zinc, zirconium and alkaline earth metal in deionized water to prepare a dispersion liquid with a certain concentration; under the condition of continuous constant-temperature stirring, sequentially adding an emulsifier with a certain stoichiometric ratio, fully and uniformly mixing for a certain time, and maintaining a certain pH value to generate mixed slurry; carrying out ultrasonic treatment on the mixed slurry in an ultrasonic device for a certain time, and washing with water for a certain number of times to obtain a related product; placing the product in a muffle furnace, roasting for a certain time at a certain temperature, and cooling to obtain the alkaline earth metal modified CO2 hydrogenation catalyst. According to the invention, active sites can be effectively increased, the catalytic activity is improved, and the catalytic conversion rate and selectivity are improved.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to an alkaline earth metal modified CO 2 Preparation method of hydrogenation catalyst. Background technique [0002] CO 2 The preparation method of the catalyst for hydrogenation to methanol has an important influence on the performance of the catalyst. Commonly used catalyst preparation methods include co-precipitation method, impregnation method, sol-gel method, combustion decomposition method, etc., all of which have been effectively used in the process of catalyst preparation. . [0003] In current applied research, CO 2 The main active components of the catalyst for hydrogenation to methanol include CuO, ZnO, ZrO 2 , Al 2 O 3 And some rare earth or alkali metal and alkaline earth metal components used for doping modification. [0004] However, the inventor found in the research that only CO prepared by the above catalyst preparation method 2 The catalytic a...

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Problems solved by technology

[0004] However, the inventors have found in their research that only the CO produced by the above-mentioned catalyst preparation method 2 The catalytic activity of the hydrogenation methanol catalyst is not ideal, and there are disadvantages such as low conversion rate and low selectivity.