Anthraquinone hydrogenation heterogeneous channel monolithic catalyst and preparation method thereof

Abstract

The invention discloses an anthraquinone hydrogenation non-uniform pore overall catalyst and a preparation method thereof. The area ratio of the opening I and the opening II at both ends of the pore channel of the catalyst is 1:1.1~1:100, preferably 1:2~1 : 10. The cross-sectional area of ​​the channel between opening I and opening II increases continuously or stepwise, or a combination of both. The preparation method is as follows: (1) Dip a carrier with an overall catalyst shape into a solution containing active components, take it out after a certain period of immersion, and obtain an oxidized catalyst after drying and roasting; (2) Dip the obtained oxidized catalyst After reduction and then drying under an inert atmosphere, an anthraquinone hydrogenation heterogeneous channel monolithic catalyst is obtained. The monolithic catalyst of the present invention has non-uniform pores and is used in the hydrogenation process of preparing hydrogen peroxide by the anthraquinone method, thereby ensuring the reaction activity of the catalyst while improving the selectivity of the reaction.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a reduced noble metal integral catalyst with a non-uniform pore structure, which is mainly used for the anthraquinone hydrogenation reaction in the process of preparing hydrogen peroxide by an anthraquinone method. Background technique [0002] Hydrogen peroxide, also known as hydrogen peroxide, is an important chemical raw material, which has been produced in industry as early as the middle of the 19th century, and is one of the main basic chemical products in the world. With the growth of social demands, especially the increasing importance of ecological environment protection, hydrogen peroxide has become an important chemical. As an oxidizing agent, bleaching agent, disinfectant, polymer initiator and crosslinking agent, it is widely used in papermaking, textile, chemical synthesis, military industry, electronics, food processing, medicine, cosmetics, environme...

AI Technical Summary

Problems solved by technology

The hydrogen efficiency of the catalyst has been significantly improved, but there are still shortcomings such as many preparation steps, large amount of noble metals and low catalyst selectivity.

[0010] In the prior art, generally used monolithic catalysts have a uniform pore size structure, that is, during the reaction, the flow rate of the reactant in the pore is constant, but as the reaction progresses, the content of the reactant in the reaction system continues to decrease, and the same Under the condition of flow rate, it is difficult to achieve a higher conversion depth, which leads to side reactions at the beginning due to the high initial activity of the catalyst, and in the later stage, the conversion depth is not enough due to too fast flow rate, that is, the activity and selectivity of the reaction are uniform. lower result

Images