Catalytic hydrogenation catalyst as well as preparation and application thereof in tetrahydrofarnesyl acetone selective hydrogenation reaction

Abstract

The invention discloses a catalytic hydrogenation catalyst as well as preparation and application thereof in a tetrahydrofarnesyl acetone selective hydrogenation reaction. The catalyst is composed ofan activated carbon carrier coated with a modification coating and metallic quantum dots supported onto the carrier, wherein the metal is palladium; the particle size of the metallic quantum dots ranges from 3nm to 6nm; the activated carbon is random or formed granular active carbon and has the size of not more than 1cm; the pore structure of the activated carbon coated with the modification coating mainly includes a mesoporous structure, the microporous proportion is reduced to 10% or less, and composition materials of the modification coating comprise titanium dioxide, silicon dioxide and titanium silicate. The invention discloses application of the catalytic hydrogenation catalyst in a reaction of synthesizing hexahydrofarnesyl acetone through selective hydrogenation of tetrahydrofarnesyl acetone. The application has the characteristics of being additive-free, high in conversion rate, excellent in selectivity, high in hydrogenation reaction rate, excellent in stability, long in service life and recyclable in hydrogen.

Description

(1) Technical field [0001] The invention relates to a fixed-bed catalytic hydrogenation catalyst and its preparation and application, in particular to the application of the catalyst in the fixed-bed catalytic tetrahydrofarnesyl acetone selective hydrogenation reaction. (2) Technical background [0002] 6,10,14-Trimethyl-2-pentadecanone (hexahydrofarnesylacetone, PA) is an important chemical intermediate for the preparation of vitamin E. The demand for VE has increased significantly. At present, PA is mainly prepared by 6,7-dihydrolinalool or 1,2-dehydrolinalool in industry. But in these existing several PA synthesis routes, all need finally through 6,10,14-trimethyl-13-ene-2-pentadecanone (tetrahydrofarnesyl acetone, FA-4H) Catalytic hydrogenation process can get PA, so the production of tetrahydrofarnesyl acetone also increases year by year. Therefore, it is of great significance to develop a green catalytic hydrogenation process for industrial production requirements. ...

AI Technical Summary

Problems solved by technology

However, the catalyst activity is also affected by the pore size

The pore size of the carrier is small, and the small pore size makes it difficult for large reactant molecules to enter the pores, that is, the steric hindrance effect (or the shape selection and confinement effect of the channel), and the catalytic reaction can only occur on the surface of the catalyst, and it is effective if the interior is not fully utilized. The active sites are reduced, resulting in low activity

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