Alcohol gas phase dehydrogenation catalyst, preparation method thereof and application

Abstract

The invention discloses an alcohol gas phase dehydrogenation catalyst, a preparation method thereof and application. The catalyst is composed of cuprous oxide, zinc oxide, silicon dioxide, metal oxides, graphite and magnesium stearate according a certain ratio. The preparation method of the catalyst comprises first preparing silicon dioxide composite powder where cuprous oxide and zinc oxide are loaded, adding the metal oxides, graphite and magnesium stearate into the prepared composite powder, and carrying out mixed preforming. The catalyst enables an alcohol gas phase dehydrogenation reaction to be carried out at a low temperature, energy consumption is reduced, and the problems of chalking and coking of the catalyst caused by high temperature are solved. Besides, under the catalysis of the catalyst, a reaction for preparing isovaleraldehyde by isoamyl alcohol gas phase dehydrogenation can achieve selectivity of 98%-99%, conversion rate of 96%-99% and product purity of 95%-97%, operation of isovaleraldehyde can be simplified, preparation cost of isovaleraldehyde is reduced, and the requirements for industrialized batch production of isovaleraldehyde are fully met.

Description

technical field [0001] The invention relates to an alcohol gas-phase dehydrogenation catalyst and its preparation method and application, belonging to the technical field of catalysts. Background technique [0002] Alcohol dehydrogenation is a major method for the preparation of aldehydes and ketones. Copper, zinc, nickel, platinum, palladium, rhodium and other metals or their alloys have good activity and high selectivity for the dehydrogenation of alcohols, but platinum and other precious metals are expensive, and copper, zinc and other metals are mainly used as catalysts . [0003] In the early days, alloys such as copper or brass in the shape of particles, meshes, and fibers were used as catalysts for dehydrogenation. This type of catalyst has the following disadvantages: due to the small active surface area per unit mass of the catalyst, the catalyst activity is very low, and the conversion rate at low temperatures It is very low, and it is required to be above 400°C....

AI Technical Summary

Problems solved by technology

Copper, zinc, nickel, platinum, palladium, rhodium and other metals or their alloys have good activity and high selectivity for the dehydrogenation of alcohols, but platinum and other precious metals are expensive, and copper, zinc and other metals are mainly used as catalysts

[0003] In the early days, alloys such as copper or brass in the shape of particles, meshes, and fibers were used as catalysts for dehydrogenation. This type of catalyst has the following disadvantages: due to the small active surface area per unit mass of the catalyst, the catalyst activity is very low, and the conversion rate at low temperatures Very low, it is required to be above 400°C, and at high temperature, the deactivation rate of catalyst carbon deposition is fast, and repeated regeneration is required

Using this method, although the yield and conversion rate are high, there are still disadvantages such as high energy consumption, the product needs to be purified by rectification, and the catalyst is easy to pulverize and coke at high temperature, and regeneration is difficult, which still cannot meet the requirements of isovaleraldehyde. industrial mass production requirements