Nickel-based non-uniform duct monolithic catalyst and preparation method thereof

Abstract

The invention discloses a nickel-based non-uniform duct monolithic catalyst and a preparation method thereof. Based on the total weight of the catalyst, the catalyst comprises the following components: 20%-90% of nickel oxide, and 10%-80% of silicon oxide and / or aluminum oxide, wherein a duct structure of the catalyst has the following characteristics: the area ratio of an opening I to an opening II at two ends of a duct of the catalyst is (1 to 1.1)-(1 to 100), the duct section area between the opening I and the opening II is one or a combination of continuous increase or stepped increase. The preparation method is as follows: mixing and kneading active nickel oxide, an adhesive and a peptizing agent into plastic paste, and then placing the plastic paste into a pressing die to extrude as a non-uniform duct monolithic structure, drying and roasting, intercepting a certain height along a direction perpendicular to the duct to obtain a catalyst product. The catalyst disclosed by the invention has the non-uniform duct and is applied to a hydrogenation process of preparing hydrogen peroxide by use of an anthraquinone method, and the reaction selectivity is improved while guaranteeing the reaction activity of the catalyst.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and relates to a nickel-based monolithic catalyst with heterogeneous pores and a preparation method thereof. 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, environmental protection, metallurgy and many other fields . Since hydrogen peroxide decomposes to produce water and oxygen, it has no seconda...

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] The currently published data show that generally the overall catalyst used has 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 proceeds, the content of the reactant in the reaction system continues to decrease. , under the same flow rate, it is difficult to achieve a higher conversion depth, resulting in 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 lower sex results

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