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Ionic liquid-modified loaded carbine-palladium catalyst and application thereof in acetylene hydrogenation reaction

An ionic liquid, palladium catalyst technology, applied in catalytic reactions, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problems of low ethylene selectivity and achieve good ethylene selectivity, The effect of high acetylene conversion

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

However, the traditional catalysts used in industry have very low selectivity to ethylene when the conversion of acetylene is high.

Method used

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  • Ionic liquid-modified loaded carbine-palladium catalyst and application thereof in acetylene hydrogenation reaction
  • Ionic liquid-modified loaded carbine-palladium catalyst and application thereof in acetylene hydrogenation reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 0.08g (0.5mmol) of 1-propyl-3 methylimidazole chloride in 2mL of dimethylsulfoxide (DMSO), add 0.041g (0.5mmol) of anhydrous sodium acetate, and keep stirring at 90°C for 1h After the solid was completely dissolved, 0.22 g (1.0 mmol) of palladium acetate was added to the clear solution as a palladium precursor, and stirred and heated at 120° C. for 4 hours to obtain a carbene-palladium solution. Transfer the obtained solution to a 10 mL volumetric flask, add DMSO to the corresponding scale to obtain a carbene-palladium impregnation liquid with a concentration of 0.001 g / mL.

[0029] Using the impregnation method, according to the requirement that the palladium loading is 0.1wt%, and the ionic liquid loading is 20wt%, pipette the metered carbene-palladium impregnation solution and mix with a certain amount of 1-propyl-3 methylimidazolium chloride ionic liquid, Then add a certain amount of DMSO in the impregnation solution, and then evenly put the alumina carrier...

Embodiment 2

[0031] Dissolve 0.16g (1.0mmol) of 1-propyl-3 methylimidazole chloride in 2mL of dimethyl sulfoxide (DMSO), add 0.082g (1.0mmol) of anhydrous sodium acetate, and keep stirring at 90°C for 1h After the solid was completely dissolved, 0.22 g (1.0 mmol) of palladium acetate was added to the clear solution as a palladium precursor, and stirred and heated at 120° C. for 4 hours to obtain a carbene-palladium solution. Transfer the obtained solution to a 10 mL volumetric flask, add DMSO to the corresponding scale to obtain a carbene-palladium impregnation liquid with a concentration of 0.001 g / mL.

[0032] Using the impregnation method, pipette the measured carbene-palladium impregnation solution and mix it with a certain amount of 1-propyl-3 methylimidazolium chloride ionic liquid, then add a certain amount of DMSO into the impregnation solution, and then evenly put the alumina carrier (The specific surface area is 384m 2 / g) into the impregnating solution and sonicate. The wet su...

Embodiment 3

[0034] Dissolve 0.32g (2.0mmol) of 1-propyl-3 methylimidazole chloride in 2mL of dimethyl sulfoxide (DMSO), add 0.16g (2.0mmol) of anhydrous sodium acetate, and keep stirring at 90°C for 1h After the solid was completely dissolved, 0.22 g (1.0 mmol) of palladium acetate was added to the clear solution as a palladium precursor, and stirred and heated at 120° C. for 4 hours to obtain a carbene-palladium solution. Transfer the obtained solution to a 10 mL volumetric flask, add DMSO to the corresponding scale to obtain a carbene-palladium impregnation liquid with a concentration of 0.001 g / mL.

[0035] Using the impregnation method, pipette the measured carbene-palladium impregnation solution and mix it with a certain amount of 1-propyl-3 methylimidazolium chloride ionic liquid, then add a certain amount of DMSO into the impregnation solution, and then evenly put the alumina carrier (The specific surface area is 384m 2 / g) into the impregnating solution and sonicate. The wet sup...

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Abstract

The invention discloses an ionic liquid-modified loaded carbine-palladium catalyst and application thereof in acetylene hydrogenation reaction. The catalyst is prepared by the following steps: (1) dissolving ionic liquid A into a solvent, so as to obtain an ionic liquid solution; (2) adding potassium tert-butoxide or anhydrous sodium acetate powder, and stirring until solids are completely dissolved, so as to obtain a carbine solution; (3) adding a palladium precursor solution or into the carbine solution in a proportion, and stirring, so as to obtain a carbine-palladium-containing solution; (4) weighing a certain amount of the ironic liquid B, mixing the ironic liquid B with the carbine-palladium-containing solution, so as to obtain dipping liquid; and (5) uniformly pouring aluminum oxidecarriers into the dipping liquid until aluminum oxide is completely immersed and adequately dispersed, dipping the immersed carriers at the room temperature, and drying, so as to obtain the ionic liquid-modified loaded carbine-palladium catalyst. The catalyst presents the characteristics of high acetylene conversion rate and ethylene selectivity in the acetylene hydrogenation reaction.

Description

(1) Technical field [0001] The invention relates to a supported carbene-palladium catalyst modified by ionic liquid and its application in the reaction of acetylene selective hydrogenation to ethylene. (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 improve the quality of downstream products to remove acetylene in raw gas to less than 5ppm. [0003] In ethylene units, solvent absorption and selective hydrogenation are often used to remove acetylene from ethylene raw materials. Compared with the solvent absorption method, catalytic selective hydrogenation has less pollution than th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C07C7/167C07C11/04
CPCC07C7/167B01J31/0292B01J31/2273B01J2531/824B01J2231/645B01J35/394B01J35/393C07C11/04Y02P20/52
Inventor 李小年张群峰徐逸琦蒋亦舒许孝良赵佳丰枫
Owner ZHEJIANG UNIV OF TECH
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