Catalyst for preparing cyclohexene by partial hydrogenation of benzene and its preparation method and application

Abstract

The invention discloses a catalyst for partial hydrogenation of benzene to prepare cyclohexene and a preparation method thereof. The catalyst employs titanium dioxide-silica composite oxide as a carrier, one or several of the group VIII elements as active metal components, and boron oxide as a cocatalyst; and the catalyst comprises, by final weight, 0.5-10.0% of boron oxide, 0.1%-10% of group VIII active metal components, and the balance of titanium dioxide-silica composite oxide. The preparation method of the catalyst for partial hydrogenation of benzene to prepare cyclohexene is by successively loading boron oxide and group VIII active metal components on the titanium dioxide-silica composite oxide carrier. The catalyst can obviously improve the conversion rate of benzene and the selectivity of cyclohexene.

Description

technical field [0001] The invention relates to a catalyst for preparing cyclohexene by partial hydrogenation of benzene, a preparation method and application thereof. Background technique [0002] Cyclohexene has active double bonds and is an important organic chemical raw material. As an intermediate, cyclohexene can be widely used in the production of medicines, pesticides, dyes, detergents, explosives, feed additives, polyesters and other fine chemicals. [0003] Industrially, there are many ways to obtain cyclohexene. Traditionally, there are methods such as dehydration of cyclohexanol and dehydrohalogenation of halocyclohexane. Due to the use of high-cost cyclohexanol and halocyclohexane as raw materials, and the complicated process, the production cost of cyclohexene obtained by traditional methods is relatively high. The cyclohexene obtained by the traditional method is usually only suitable for the preparation of products with small demand and high added value. ...

AI Technical Summary

Problems solved by technology

USP4678861 discloses a technology for the partial hydrogenation of benzene to cyclohexene in a suspended state. The catalytic reaction is completed in two phases. The disadvantage of this process is that the catalyst must be separated from the organic phase and compared with possible salts. difficulty

Chinese patent CN1597099A discloses a ruthenium-based supported catalyst prepared by an impregnation precipitation method with metal oxide zirconia as a carrier. The yield of cyclohexene can only reach 40%, and the catalyst uses zirconia as a carrier, and the precious metal difficult to recycle

But the conversion rate of benzene is low