Alkyl anthraquinone hydrogenation catalyst and preparation method thereof

Abstract

The invention discloses an alkyl anthraquinone hydrogenation catalyst and a preparation method thereof. The alkyl anthraquinone hydrogenation catalyst is applied to a technology for producing hydrogen peroxide by an anthraquinone method. The alkyl anthraquinone hydrogenation catalyst is prepared from a catalyst carrier (a CNTs-TiO2 complex) and an active component (palladium atoms) by an equivalent-volume impregnation method, wherein in terms of the elementary palladium atoms, the active component accounts for 0.1-5% of the total weight of the alkyl anthraquinone hydrogenation catalyst; the CNTs-TiO2 complex is prepared from TiO2 and Ni(NO3)2 by a chemical vapor deposition method in the presence of a carbon source gas; the molar ratio of the TiO2 to the Ni(NO3)2 is (0.04-0.25): (0.015-0.2); CNTs accounts for 5-30% of the total weight of the CNTs-TiO2 complex. In the alkyl anthraquinone hydrogenation catalyst, the carrier CNTs-TiO2 complex has a relatively large external specific surface area, so that envelopment of the palladium atoms in the carrier can be effectively reduced, and thus the palladium atoms are fully utilized to improve the activity of the alkyl anthraquinone hydrogenation catalyst; meanwhile, the acidity of the CNTs-TiO2 complex is weaker than Al2O3, and under the action of the TiO2, occurrence of a degradation reaction in the reaction process can be effectively reduced, so that production of a degraded product in a working fluid is reduced. The alkyl anthraquinone hydrogenation catalyst has the characteristics of high hydrogenation efficiency, low anthraquinone degradation and the like in the process of producing the hydrogen peroxide by the anthraquinone method.

Description

technical field [0001] The invention relates to an alkyl anthraquinone hydrogenation catalyst and a preparation method thereof, belonging to the technical field of chemical industry. Background technique [0002] Hydrogen peroxide is a green chemical product, which is widely used in textile, chemical, paper, military, environmental protection, electronics, medicine, food, mining, construction and other industries. Although the production methods of hydrogen peroxide include electrolysis, anthraquinone method, isopropanol method and direct synthesis of hydrogen and oxygen, the anthraquinone method is still the main method of hydrogen peroxide production in the world. The technological process of the anthraquinone method mainly includes three processes of hydrogenation, oxidation and extraction, among which the hydrogenation process is the core of the whole process. The anthraquinone method mostly uses supported palladium catalysts, and one of the keys is the selection of the...

AI Technical Summary

Problems solved by technology

However, the activity and selectivity of the palladium catalyst used are a pair of contradictory factors. If the activity of the catalyst is too low, it will affect the production capacity of hydrogen peroxide in the production enterprise. If the activity of the catalyst used is too high, the actual production process will often be due to Excessive hydrogenation leads to deterioration of the working condition of the working fluid system and increased degradation products

These degradation products not only affect the hydrogenation efficiency of the working fluid (the yield of hydrogen peroxide), but also affect the solubility of anthraquinone and hydroanthraquinone in the working fluid, resulting in the viscosity of the working fluid or the precipitation of anthraquinone, which is not conducive to the separation and maintenance of catalysts. Reuse of working fluid

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