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Layered Double Hydroxides Derived ZnO‐Al 2 O 3 Supported Pd‐Ag Catalysts for Selective Hydrogenation of Acetylene
Author(s) -
Gao Xiaoping,
Zhou Yanan,
Jing Fangli,
Luo Jingjie,
Huang Qingsong,
Chu Wei
Publication year - 2017
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201600865
Subject(s) - acetylene , bimetallic strip , catalysis , chemistry , ethylene , selectivity , layered double hydroxides , intermetallic , differential thermal analysis , thermogravimetric analysis , gravimetric analysis , inorganic chemistry , coke , palladium , nuclear chemistry , organic chemistry , alloy , physics , diffraction , optics
Abstract ZnO‐Al 2 O 3 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‐Al 2 O 3 catalyst showed the best catalytic performance among the prepared samples. It was found that the catalyst carrier of ZnO‐Al 2 O 3 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 selectivity towards ethylene was in the order of Pd‐Ag/ ZnO‐Al 2 O 3 >Pd/ ZnO‐Al 2 O 3 >Pd‐Ag/ Al 2 O 3 >Pd/ Al 2 O 3 at a high conversion level. As the thermal gravimetric and differential temperature analysis ( TG‐DTA ) revealed, Pd‐Ag intermetallic catalyst on the ZnO‐Al 2 O 3 support showed less coke formation.