Aluminum oxide loaded ionic liquid-palladium catalyst, preparation thereof and application thereof in front-end hydrogenation reaction of acetylene

A technology of alumina support and alumina carrier, which is applied in the direction of catalytic reaction, carbon compound catalyst, physical/chemical process catalyst, etc., can solve the problems of affecting reaction stability and low ethylene selectivity, and achieve the promotion of the formation of carbene structure, Effect of improving ethylene selectivity and high acetylene conversion rate
CN109174178AActive Publication Date: 2019-01-11ZHEJIANG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV OF TECH
Publication Date
2019-01-11

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Abstract

The invention discloses an aluminum oxide loaded ionic liquid-palladium catalyst, preparation thereof and application thereof in the front-end hydrogenation reaction of acetylene. The catalyst comprises an aluminum oxide carrier, ionic liquid and a palladium compound, wherein the surface of the aluminum oxide carrier is loaded with the ionic liquid and the palladium compound; the palladium compound is one of chloropalladic acid, palladium nitrate, palladium acetate, palladium acetylacetonate, palladium dichloride, ammonium tetrachloropalladate, sodium chloropalladate, and tetraammine palladiumnitrate; the ironic liquid is selected from imidazole ironic liquid, and anions are chloride ions, bromide ions, hexafluorophosphate, tetrafluorophosphate or (trifluoromethane sulfonyl) imine ions; alayer of liquid film is formed on the surface of the carrier by the ionic liquid, and a carbene structure is further formed by the ionic liquid and the palladium compound; and the loading capacity ofpalladium in the catalyst is 0.01wt%-0.5wt%, and the loading capacity of the ionic liquid is 10wt%-40wt%. The catalyst is applied to the selective front-end hydrogenation of acetylene in a high hydrogen-acetylene ratio, so that the selectivity of acetylene in the reaction can be greatly improved.
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Description

(1) Technical field

[0001] The invention relates to an alumina-loaded ionic liquid-palladium catalyst suitable for selective hydrogenation of acetylene with a high hydrogen-alkyne ratio and its preparation and application. (2) Technical background

[0002] As an important organic chemical raw material, ethylene is widely used in various fields. The ethylene raw material gas obtained from industrial production often contains 1% acetylene. The trace amount of acetylene mixed in the ethylene feed gas will poison the catalyst of the subsequent ethylene polymerization reaction and reduce the quality of polyethylene products. Therefore, it is of great significance to remove the acetylene in the feed gas to below 5ppm. In ethylene units, solvent absorption and selective hydrogenation are often used to remove acetylene from ethylene raw materials. Due to different processes in industry, selective hydrogenation of acetylene can be further divided into pre-hydrogenation process and...

Claims

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