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Alloy single atom catalyst for selective hydrogenation of alkyne

A catalyst and alloy technology, which is applied in the preparation of catalysts and the research field of alkyne selective hydrogenation activity, can solve the problems of high ethylene selectivity and high selective hydrogenation activity, and achieve high ethylene selectivity, high hydrogenation activity, Reduce the effect of caloric variation

Active Publication Date: 2015-05-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This catalyst has the characteristics of high selective hydrogenation activity and high ethylene selectivity for acetylene selective hydrogenation reaction

Method used

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  • Alloy single atom catalyst for selective hydrogenation of alkyne
  • Alloy single atom catalyst for selective hydrogenation of alkyne
  • Alloy single atom catalyst for selective hydrogenation of alkyne

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] APTES Modified SiO 2 Carrier:

[0035] Measure 400 mL of ethanol into a 500 mL three-necked flask with a graduated cylinder, and then add 20.00 g of 3-aminopropyltriethoxysilane (APTES) to prepare a solution. Accurately weigh 8.00gSiO 2 , added to the above solution. The three-neck flask was placed in a water bath, stirred magnetically, and refluxed at 80°C for 24h. Then, filter, wash with ethanol, and dry in an oven at 60°C for 6h. APTES modified SiO 2 carrier.

Embodiment 2

[0037] AuPd 0.01 / SiO 2 Catalyst preparation:

[0038] At room temperature (~25°C), measure 5.23mL (9.56mg / mL) HAuCl 4 Add water to the solution to 20mL, stir well and add 1.0g APTES-modified SiO 2 Carrier, continue to stir for 30min to make HAuCl 4 Adsorbed on the surface of the carrier, after filtering and washing, redisperse it in 20mL of 0.1M NaBH 4 in aqueous solution. After stirring, filter and wash until AgNO 3 Cl cannot be detected - . The resulting precursor was redispersed to 0.14 mL (2 mg / mL) Pd(NO 3 ) 2 In the 20mL solution prepared by the solution, after stirring, filtering and washing, repeat the above NaBH 4 Restore step. Finally, it is dried at 80°C for 10h and calcined at 500°C for 6h to obtain AuPd 0.01 / SiO 2 bimetallic catalyst. The theoretical loading of Au was maintained at 5%, and the Pd / Au molar ratio was 0.01.

Embodiment 3

[0040] AuPd 0.025 / SiO 2 Catalyst preparation:

[0041] At room temperature (~25°C), measure 5.23mL (9.56mg / mL) HAuCl 4 Add water to the solution to 20mL, stir well and add 1.0g APTES-modified SiO 2 Carrier, continue to stir for 30min to make HAuCl 4 Adsorbed on the surface of the carrier, after filtering and washing, redisperse it in 20mL of 0.1M NaBH 4 in aqueous solution. After stirring, filter and wash until AgNO 3 Cl cannot be detected - . The resulting precursor was redispersed to 0.34 mL (2 mg / mL) Pd(NO 3 ) 2 In the 20mL solution prepared by the solution, after stirring, filtering and washing, repeat the above NaBH 4 Restore step. Finally, it is dried at 80°C for 10h and calcined at 500°C for 6h to obtain AuPd 0.025 / SiO 2 bimetallic catalyst. The theoretical loading of Au was maintained at 5%, and the Pd / Au molar ratio was 0.025.

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Abstract

The present invention relates to a palladium-containing alloy single atom catalyst for selective hydrogenation of alkyne. According to the catalyst, an inert oxide SiO2 is adopted as a carrier, Pd and one or two or more than two materials selected from metal elements in group IB or Group VIII excluding Pd are combined to prepare the supported palladium-containing alloy catalyst so as to make the Pd be in the complete or partial single atom distribution state, wherein the Pd accounts for 0.002-1% of the weight of the carrier, and the content of other metal elements accounts for 0.2-8% of the weight of the carrier. The palladium-containing alloy single atom catalyst has characteristics of high catalytic hydrogenation activity, high ethylene selectivity and the like, and has the good reaction catalysis performance in the reaction for preparing ethylene gas to eliminate trace acetylene through petroleum cracking under the condition close to the industrial condition.

Description

technical field [0001] The invention belongs to the field of industrial application, and relates to the preparation of a catalyst and the research on its activity for selective hydrogenation of alkynes. It specifically relates to the preparation of a palladium-containing alloy single-atom catalyst supported by an inert carrier and its application in the selective hydrogenation of acetylene under the condition of ethylene. Background technique [0002] The selective hydrogenation of alkynes to the corresponding alkenes is an industrially important reaction. In the field of petrochemical industry, ethylene is a monomer for preparing polymers, which can be prepared by steam cracking of naphtha. The ethylene fraction in the cracking and separation section contains 0.1-2% acetylene, which is a catalyst poison when ethylene is further polymerized and affects the normal progress of the polymerization reaction, so it must be removed. Catalysts are usually used in the industry to c...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J23/50C07C11/04C07C5/09
CPCY02P20/52
Inventor 刘晓艳裴广贤王爱琴张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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