Supported rare earth-modified metal catalyst, and preparation method and application thereof

Abstract

The invention discloses a supported rare earth-modified metal catalyst which comprises a rare earth element-modified alumina carrier and active components supported on the rare earth element-modifiedalumina carrier, and the active components comprise an alkali metal element and a tungsten element; in the supported rare earth-modified metal catalyst, the mass percentage content of rare earth elements is 0.4-5% based on oxide. After the rare earth elements are added into the supported rare earth-modified metal catalyst for modification, the supported rare earth-modified metal catalyst has better catalytic performance when applied to preparation of methyl mercaptan through a reaction of methanol and hydrogen sulfide, the selectivity and yield of methyl mercaptan are improved, and the reaction temperature and the circulation amount of hydrogen sulfide are reduced.

Description

technical field [0001] The invention belongs to the field of supported catalysts, and in particular relates to a supported rare earth modified metal catalyst and its preparation method and application. Background technique [0002] Methylmercaptan, known as methanethiol or methylmercaptan in English, is an important organic chemical raw material and a commonly used intermediate in organic synthesis. Sulfurylating reagents. The preparation of methyl mercaptan by methanol-hydrogen sulfide reaction is the main way to produce methyl mercaptan on a large scale at present. This route was first proposed in 1910, and the catalyst is ThO 2 . Due to ThO 2 The catalyst has disadvantages such as harsh reaction conditions and low yield of methyl mercaptan. Researchers have conducted a lot of research on the catalyst. From the 1950s to the 1970s, the methanol-hydrogen sulfide route was industrialized abroad, and the catalyst was alumina, but the yield of methyl mercaptan was only 60-7...

AI Technical Summary

Problems solved by technology

Due to ThO 2 The catalyst has disadvantages such as harsh reaction conditions and low yield of methyl mercaptan. Researchers have conducted a lot of research on the catalyst

From the 1950s to the 1970s, the methanol-hydrogen sulfide route was industrialized abroad, and the catalyst was alumina, but the yield of methyl mercaptan was only 60-70%.

[0013] (3) The catalyst has a low conversion rate to methanol when the mol ratio of hydrogen sulfide to methanol is low;

[0014] (4) The catalyst is used in the preparation of methyl mercaptan, the required reaction temperature is high, and it is easy to cause thermal damage to the reactor

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