Activated coke supported nano-gold catalyst as well as preparation method and application thereof

Abstract

The invention discloses an activated coke supported nano-gold catalyst as well as a preparation method and application thereof. The catalyst takes activated coke as a carrier, and the surface of the carrier is loaded with gold nanoparticles. The preparation method of the catalyst comprises the following steps: mixing the activated coke with water, then mixing the obtained mixture with a chloroauric acid solution, and carrying out ultrasonic treatment to obtain mixed liquid of the activated coke and chloroauric acid; mixing the obtained mixed liquid with an ascorbic acid solution for carrying out a reduction reaction to obtain the activated coke supported nano-gold catalyst. The activated coke supported nano-gold catalyst provided by the invention has the advantages of being good in dispersity, high in load rate, good in adsorption performance and catalytic performance, and the like; the preparation method of the catalyst has the advantages of simple preparation process, simpleness andconvenience in operation, high production efficiency, short production cycle, low cost, high product yield rate, and the like; an activating agent and a protective agent are not added into the catalyst, and the catalyst can be prepared on a large scale under the room temperature condition, and is beneficial to industrial utilization. The catalyst provided by the invention can rapidly and thoroughly realize catalytic reduction of nitroaromatic compounds, thus having good use value and application prospect.

Description

technical field [0001] The invention belongs to the technical field of nano-metal catalyst preparation, and relates to an active coke-loaded nano-gold catalyst and a preparation method and application thereof. Background technique [0002] Nitroaromatic compounds are common industrial pollutants with characteristics of high toxicity and resistance to biodegradation. The reduction product aromatic amine is an important intermediate product in industrial production and application, and is used in the synthesis of fine chemicals such as pesticides, medicines, synthetic resins, and surfactants. Currently, the development of new catalysts for this reaction is a research hotspot. With the development of nanoscience and technology, nano-gold catalysts with high specific surface area are used in catalytic reduction of nitro compounds, electrochemical reduction of CO 2 , Low-temperature catalytic oxidation of CO and other aspects have attracted extensive research by scholars. Howe...

AI Technical Summary

Problems solved by technology

However, the existing nano-gold catalysts have the following problems: as Hao Zhengping (CN 101805256) prepared a mesoporous carbon-supported gold catalyst, which is only used for the oxidation of glucose; Yan Xinhuan et al. (CN 102553583A) et al. The nano-gold catalyst supported by porous carbon can be used for the hydrogenation reaction of nitrobenzene compounds, but the hydrogenation reaction needs to be heated and pressurized, which increases energy consumption; Alain Tuel et al. used Au / SAB-15 as the template and sucrose as the carbon Source, prepared Au / mesoporous carbon catalyst, but its catalytic activity is not as good as Au / SAB-15; Zhang Peng et al. used traditional electrospinning technology and in-situ chemical reduction method to prepare CNFs@Au catalyst, the catalytic effect is better, but the preparation complicated method

In addition, the following problems still exist in the preparation methods of existing nano-gold catalysts: (1) a protective agent is added in the preparation process, and the protective agent is difficult to remove by general washing methods; (2) some production processes must be processed under high temperature conditions. (3) The preparation steps are complicated, and the chemical reagents used are too many, which easily causes secondary pollution to the environment

In addition, the catalytic reduction of nitroaromatic compounds using existing nano-gold catalysts is not ideal, and it takes a long time to completely catalyze the reduction of nitroaromatic compounds.

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