Preparation method of hollow palladium catalyst microspheres

Abstract

The invention discloses a preparation method of hollow palladium catalyst microspheres, wherein the preparation method comprises the steps: adding ethyl cellulose into diethyl ether, uniformly stirring to form a dissolving solution, then adding ammonium carbonate, continuously stirring at a constant temperature for 30-60 min, and granulating to form particles; adding ethyl silicate into absolute diethyl ether, stirring at low temperature to form silyl ether liquid, then uniformly spraying the silyl ether liquid on the surfaces of particles, and drying at constant temperature to form a first surface film; adding ethyl silicate and palladium acetate into diethyl ether, uniformly stirring to form a mixed solution, then uniformly spraying the mixed solution on the first surface film, and drying at constant temperature to obtain a second surface film; uniformly spraying the silyl ether liquid on the second surface film, and drying at constant temperature to obtain a third surface film; and then putting the particles with the third surface film into a reaction kettle, standing for 2-5 hours to obtain a prefabricated catalyst, and carrying out reduction reaction to obtain the hollow palladium catalyst. The mesoporous structure of a silica layer can effectively prevent macromolecules from entering, contact between hydrogen molecules and palladium particles is not affected, and a good catalytic effect is achieved.

Description

technical field [0001] The invention belongs to the field of hydrogenation catalysis, and in particular relates to a preparation method of hollow palladium catalyst microspheres. Background technique [0002] The active metal components of the hydrogenation catalyst are in the oxidized state before use, and the active metal of the oxidized state catalyst needs to be activated before it has high catalytic activity. With the long-term operation of the catalyst, the deactivation of the hydrogenation catalyst exists. The current hydrogenation catalysts are mainly noble metal hydrogenation catalysts, which utilize the activity of the precious metal surface to achieve the hydrogenation effect. However, in the actual use process, the raw materials of the hydrogenation reaction are easily formed surface adhesion, resulting in the deactivation of the catalyst. SUMMARY OF THE INVENTION [0003] In view of the problems in the prior art, the present invention provides a method for pr...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems in the prior art, the present invention provides a method for preparing hollow palladium catalyst microspheres, which solves the problem that existing catalysts are easily deactivated, and utilizes the mesoporous structure of the silicon-oxygen layer to effectively prevent macromolecules from entering. At the same time, it does not affect the contact between hydrogen molecules and palladium particles, achieving a good catalytic effect and improving the service life of the catalyst