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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

Active Publication Date: 2019-01-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also some disadvantages in the pre-hydrogenation process: for example, the reaction raw material gas contains excessive hydrogen, which makes the selectivity of ethylene in the pre-hydrogenation reaction low, and other impurities in the gas will also affect the stability of the reaction.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0038] Weigh a certain amount of PdCl 2 Dissolve in concentrated hydrochloric acid, transfer to a volumetric flask, add a certain amount of deionized water to the corresponding scale, and prepare a chloropalladium acid solution with a mass concentration of palladium of 0.001g / mL. According to the loading capacity and the proportioning ratio listed in Table 1, the metered chloropalladium acid solution and ionic liquid are mixed, and a certain amount of deionized water is added, after stirring evenly, the alumina carrier (specific surface area is 384m 2 / g) Pour into the impregnating solution, and ultrasonically disperse it evenly. Wet alumina was impregnated at room temperature for 12 hours and dried at 110° C. for 12 hours to obtain an alumina-supported ionic liquid-palladium catalyst capable of forming a special carbene-palladium structure.

[0039] figure 2 and image 3 Respectively Pd-[Prmim][Cl] / Al prepared in Example 7 2 o 3 The C 1s XPS spectrum and N1s XPS spectru...

Embodiment 4

[0040] In Example 4, the texture properties of the alumina carrier before and after loading ionic liquid and Pd are compared. figure 1 :

[0041] Table 1 Comparison of carrier texture properties before and after loading ionic liquid

[0042]

[0043] The data in Table 1 show that the supported ionic liquids in Al 2 o 3 A liquid film is formed on the surface of the carrier.

Embodiment 6

[0045] With reference to the operation of Example 5, the only difference is that the carrier is replaced with a specific surface area of ​​58m 2 / g of alumina to prepare an alumina-supported ionic liquid-palladium catalyst capable of forming a special carbene-palladium structure.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C07C11/04C07C5/09
CPCB01J31/0284B01J2231/645C07C5/09C07C2531/02C07C11/04Y02P20/52
Inventor 李小年张群峰徐逸琦徐浩赵佳丰枫
Owner ZHEJIANG UNIV OF TECH
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