Hydrogenation catalyst and preparation method thereof

Abstract

The present invention provides a hydrogenation catalyst, the hydrogenation catalyst comprises a carrier and an active component having a catalysis effect, the carrier comprises alpha-Al2O3 and MgO, and the active component comprises a platinum element. According to the invention, alumina with a specific crystal form is used as an inner core and is coated with a basic oxide to form a composite carrier, and then a noble metal is loaded on the composite carrier to obtain the hydrogenation catalyst. The hydrogenation catalyst is applied to a reaction for preparing OPP through hydrogenation hydrogenolysis of dibenzofuran, and has the characteristics of high OPP selectivity, few byproducts, good stability, long service life and the like. More active noble metals in the hydrogenation catalyst are dispersed on the surface of the carrier, so that the use amount of noble metal components is reduced. The hydrogenation catalyst is simple in preparation process and easy for large-scale production. Therefore, the hydrogenation catalyst provided by the invention has excellent industrial application prospects.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a hydrogenation catalyst and a preparation method thereof. Background technique [0002] At present, the main production processes used in the industrial production of o-phenylphenol (OPP) include the di-condensation route of cyclohexanone and the high-pressure hydrolysis route of chlorobenzene. Among them, the cyclohexanone condensation dehydrogenation process is developed and used by the German Bayer Company, which requires high equipment. It uses concentrated sulfuric acid as a catalyst to generate a large amount of acidic wastewater. Domestic enterprises mostly use this route. The high-pressure hydrolysis route of chlorobenzene was developed by Dow Chemical Company in the United States. This process produces a large number of by-products of p-phenylene ether and p-phenylphenol. The main product OPP is purified by recrystallization. The purity is not high, and there is a l...

AI Technical Summary

Problems solved by technology

This method uses butyl titanate as the titanium source, and introduces it into the pores of the ordered mesoporous silica material through the sol-gel method. It needs to be washed with a large amount of water and ethanol, and a large amount of waste water will be generated during industrial scale-up, which is harmful to environmental protection. Great impact; when OPP is prepared by catalytic hydrogenation of oxyfluorene, the product OPP selectivity is less than 33%, most of the product is biphenyl, and the economic benefit is low

[0007] It can be seen that the existing catalysts for the hydrogenation of oxyfluorene to prepare o-phenylphenol have problems such as high cost, complicated preparation process, low OPP selectivity, and short service life.

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