Method for preparing high-selectivity Pd/TiO2-C hydrogenation catalyst

Abstract

The invention provides a method for preparing a high-selectivity Pd / TiO2-C hydrogenation catalyst, which comprises the following steps of: preparing an inorganic acid solution of a Pd-containing compound, and preparing an inorganic base solution of the Pd-containing compound; preparing a suspension solution of TiO2-C powder; adding the inorganic acid solution of the Pd-containing compound into the suspension solution of TiO2-C powder, regulating the pH value of the suspension to be 2-4, and standing for 0.01-1 hour; adding the inorganic base solution until the pH value reaches 8-12, and standing for 0.01-1 hour; adding the inorganic acid solution of the Pd-containing compound, regulating the pH value of the suspension to be 2-4, and standing for 0.01-1 hour, thereby finishing one PH swing; repeating the processes for 1-10 times; and then, reducing the suspension by a reducer to obtain the Pd / TiO2-C hydrogenation catalyst in which the Pd content is 1.1-20%. The Pd / TiO2-C hydrogenation catalyst prepared by the method provided by the invention has high hydrogenation conversion rate and high selectivity.

Description

technical field [0001] The present invention relates to a kind of highly selective Pd / TiO 2 -C hydrogenation catalyst preparation method, the catalyst can be used for catalytic hydrogenation of various unsaturated organic compounds in petrochemical, pharmaceutical, dyestuff, pesticide and other industries, especially for the selection of nitro, alkyne, ketone, aldehyde, etc. Sexual hydrogenation. Background technique [0002] Supported noble metal catalysts have good hydrogenation performance, and are used in the catalytic hydrogenation of various unsaturated organic compounds in petrochemical, pharmaceutical, dyestuff, pesticide and other industries, especially the selective addition of nitro, alkynes, ketones, aldehydes, etc. Hydrogen plays an extremely important role. The properties of the catalyst are not only determined by the composition and content, but also closely related to the preparation method and process conditions of the catalyst. The same raw material, the ...

AI Technical Summary

Problems solved by technology

[0009] For Pd / TiO in the prior art 2 The selectivity of hydrogenation catalyst is low, and the shortcoming that the load capacity of active component Pd is difficult to improve, the object of the present invention is to provide a kind of method that adopts pH swing to be in TiO 2 -C powder loaded with high content of noble metal Pd to prepare highly selective Pd / TiO 2 -C hydrogenation catalyst method