Preparation method of recyclable and reusable hydrogenation catalyst

Abstract

The invention relates to a preparation method of a recyclable and reusable hydrogenation catalyst. The preparation method is characterized by comprising the following steps: using a layer of poly dopamine to coat the surface of silicon dioxide, then adding an appropriate amount of deionized water as well as 0.5-500 mM rhodium chloride or ruthenium chloride or palladium chloride aqueous solution, performing reaction for 2-32 hours at the temperature of 20-100 DEG C, and performing oven-drying for 2-48 hours at the temperature of 25-75 DEG C to obtain a catalyst precursor; then adding 0.1%-20% of sodium borohydride aqueous solution, performing reaction for 1-24 hours at the temperature of 10-90 DEG C, and then performing oven-drying for 6-48 hours at the temperature of 10-90 DEG C to obtain the hydrogenation catalyst. The preparation method is simple in process, mild in reaction conditions and easy to operate; the hydrogenation catalyst has good stability to mediums such as air and water, and is simple in storage and processing manner; the operation of the hydrogenation catalyst does not need nitrogen protection; moreover, the hydrogenation reaction can be performed at lower temperature, the hydrogenation catalyst has a better hydrogenization effect after being used for 5 times in a recycling manner, and the recovery rate of the hydrogenation catalyst is more than 90%.

Description

technical field [0001] The invention relates to a preparation method of a recyclable and reusable hydrogenation catalyst, and the prepared hydrogenation catalyst is used for the hydrogenation modification of unsaturated rubber at a relatively low temperature. After the reaction, the hydrogenation catalyst has good recyclability and reutilization Effect. Background technique [0002] Nitrile rubber has good oil resistance to non-polar oils due to the cyano group contained in its main molecular chain. However, because its main chain contains a large number of unsaturated double bonds, it has poor heat resistance, ozone resistance and weather resistance, which greatly limits its application in industry. Through hydrogenation modification, its unsaturated carbon-carbon double bond can be saturated, which can not only maintain its original performance, but also improve its heat resistance, ozone aging resistance and other properties, thus greatly improving its performance in var...

AI Technical Summary

Problems solved by technology

However, this catalytic system has the disadvantages of complex catalyst preparation process and high reaction temperature, and the catalyst after reaction cannot be recycled and reused.

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