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Promotional Effect of Ni in the Selective Gas‐Phase Hydrogenation of Chloronitrobenzene over Cu‐based Catalysts
Author(s) -
CárdenasLizana Fernando,
Bridier Blaise,
Shin Choong Catherine Kai,
PérezRamírez Javier,
KiwiMinsker Lioubov
Publication year - 2012
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201100470
Subject(s) - catalysis , hydrotalcite , selectivity , x ray photoelectron spectroscopy , inorganic chemistry , hydrogen , alloy , ternary operation , copper , phase (matter) , atmospheric pressure , chemistry , materials science , chemical engineering , organic chemistry , oceanography , computer science , engineering , programming language , geology
We present 100 % selectivity to p‐ chloroaniline through the continuous gas‐phase (atmospheric pressure; T =393–523 K) catalytic hydrogenation of p‐ chloronitrobenzene over an activated CuAl (molar Cu/Al ratio 3:1) hydrotalcite. The synthesis by continuous co‐precipitation and application of a CuNiAl (atomic Cu/Ni/Al ratio 2.75:0.25:1) catalyst is also described. Temperature‐programmed reduction in hydrogen and XPS analyses of the ternary catalyst suggest CuNi interaction with no evidence of (bulk) alloy formation (based on XRD). Under the same reaction conditions, CuNiAl exhibited a higher (by up to a two‐fold) hydrogenation rate when compared to CuAl, while the exclusive nitro‐group reduction was maintained.