Supported palladium catalyst and preparation method thereof

Abstract

The invention discloses a supported palladium catalyst and a preparation method thereof. The catalyst comprises a carrier, aid ingredients and an active ingredient, wherein the carrier is gamma-aluminum oxide, the aid ingredients are lanthanum and manganese or lanthanum and cobalt, and the active ingredient is palladium; the palladium load capacity is 0.2 wt% to 0.8 wt%, the lanthanum load capacity is 0.5 wt% to 1.5 wt%, and the manganese or cobalt load capacity is 0.2 wt% to 0.5 wt%. According to the catalyst, the carrier is modified with aids subjected to vacuum adsorption drying, and a proper amount of the manganese or the cobalt is added, so that the growth of Al2O3 crystal particles during high-temperature treatment can be inhibited, the specific surface area of the catalyst is enlarged, the Pd dispersity is improved, the alkalinity of the carrier surface is enhanced, the Pd concentration of the catalyst surface is increased, the Pd layer thickness is reduced, and the hydrogenation activity and selectivity of the catalyst are improved; meanwhile, the prepared catalyst is high in mechanical strength, uniform in aperture distribution and low in impurity content.

Description

technical field [0001] The invention relates to a supported metal palladium catalyst and a preparation method thereof. The catalyst can be used in the reaction of anthraquinone hydrogenation to prepare hydrogen peroxide, and belongs to the field of chemical material preparation. Background technique [0002] Hydrogen peroxide is an important inorganic chemical product, which is widely used in papermaking, chemical industry, food, environmental protection and other fields. In recent years, with the continuous development of the green chemical process, the demand for hydrogen peroxide is increasing, which in turn promotes the continuous growth of hydrogen peroxide production. The anthraquinone method has many advantages such as easy automation, large production capacity, low cost and energy consumption, and has become the first choice in the preparation of hydrogen peroxide. The process of preparing hydrogen peroxide by anthraquinone method is mainly composed of the following...

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Problems solved by technology

[0008] At present, the catalysts used in the production of hydrogen peroxide by the anthraquinone hydrogenation method in the industry are mainly ordinary alumina-supported catalysts formed by rolling balls, or supported catalysts formed by oily ammonia columns or single (double) screw extruded rods, ordinary alumina There are uneven pore size distribution, high content of mechanical impurities such as iron, calcium, sodium, magnesium, etc., and the catalyst prepared by this method has disadvantages such as poor activity selectivity, easy to fall off the palladium layer, easy to break, etc., resulting in large pressure drop in the industrial production device system, side effects More products, shorter catalyst renewal cycle

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