Layered Double Hydroxides Derived ZnO-Al2O3 Supported Pd-Ag Catalysts for Selective Hydrogenation of Acetylene

ZnO-Al2O3 derived from layered double hydroxides （ZnAl-LDH） was successfully applied for dispersion of Pd-Ag bimetallic catalysts for the selective hydrogenation of acetylene to ethylene and the Pd-Ag/ZnO-Al2O3 cata- lyst showed the best catalytic performance among the prepared samples. It was found...

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Published inChinese journal of chemistry Vol. 35; no. 6; pp. 1009 - 1015
Main Authors Gao, Xiaoping, Zhou, Yanan, Jing, Fangli, Luo, Jingjie, Huang, Qingsong, Chu, Wei
Format Journal Article
LanguageEnglish
Published Weinheim WILEY-VCH Verlag GmbH & Co. KGaA 01.06.2017
Wiley Subscription Services, Inc
Subjects
Acetylene
acetylene selective hydrogenation
Ag promoter
Aluminum oxide
Bimetals
Catalysts
Coke
Conversion
Dispersion
Ethylene
Gravimetric analysis
high selectivity
Hydrogenation
Hydroxides
Oligomerization
Oxides
Palladium
Pd catalyst
Pd/Al2O3
Selectivity
Silver
Temperature effects
Thermal analysis
Zinc oxide
ZnAl‐LDH
乙炔加氢
层状双金属氢氧化物
水滑石
选择性加氢
钯
银催化剂
锌铝尖晶石
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Summary:ZnO-Al2O3 derived from layered double hydroxides （ZnAl-LDH） was successfully applied for dispersion of Pd-Ag bimetallic catalysts for the selective hydrogenation of acetylene to ethylene and the Pd-Ag/ZnO-Al2O3 cata- lyst showed the best catalytic performance among the prepared samples. It was found that the catalyst carrier of ZnO-Al2O3 metal-oxides derived form ZnAl-LDH could significantly suppress the over-hydrogenation of acetylene to obtain the relatively higher selectivity of ethylene. The introduction of Ag restricted efficiently the formation of coke because of the oligomerization reaction, which was further evidenced by thermal gravimetric analysis. The se- lectivity towards ethylene was in the order of Pd-Ag/ZnO-Al2O3〉Pd/ZnO-Al2O3〉Pd-Ag/Al2O3〉Pd/Al2O3 at a high conversion level. As the thermal gravimetric and differential temperature analysis （TG-DTA） revealed, Pd-Ag intermetallic catalyst on the ZnO-Al2O3 support showed less coke formation.
Bibliography:31-1547/O6
ZnAl-LDH, Pd catalyst, Ag promoter, acetylene selective hydrogenation, high selectivity
ZnO-Al2O3 derived from layered double hydroxides （ZnAl-LDH） was successfully applied for dispersion of Pd-Ag bimetallic catalysts for the selective hydrogenation of acetylene to ethylene and the Pd-Ag/ZnO-Al2O3 cata- lyst showed the best catalytic performance among the prepared samples. It was found that the catalyst carrier of ZnO-Al2O3 metal-oxides derived form ZnAl-LDH could significantly suppress the over-hydrogenation of acetylene to obtain the relatively higher selectivity of ethylene. The introduction of Ag restricted efficiently the formation of coke because of the oligomerization reaction, which was further evidenced by thermal gravimetric analysis. The se- lectivity towards ethylene was in the order of Pd-Ag/ZnO-Al2O3〉Pd/ZnO-Al2O3〉Pd-Ag/Al2O3〉Pd/Al2O3 at a high conversion level. As the thermal gravimetric and differential temperature analysis （TG-DTA） revealed, Pd-Ag intermetallic catalyst on the ZnO-Al2O3 support showed less coke formation.
ISSN:1001-604X
1614-7065
DOI:10.1002/cjoc.201600865