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Palladium Supported Catalysts for Nitrocyclohexane Hydrogenation to Cyclohexanone Oxime with High Selectivity
Author(s) -
Liu PingLe,
Zhang HaiKe,
Liu SiHua,
Yao ZhengJie,
Hao Fang,
Liao HongGuang,
You KuiYi,
Luo HeAn
Publication year - 2013
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.201300377
Subject(s) - palladium , cyclohexanone oxime , catalysis , selectivity , cyclohexanone , chemistry , chemisorption , oxime , inorganic chemistry , mesoporous material , organic chemistry
Different kinds of activated carbon‐ and carbon nanotube‐supported palladium catalysts were investigated in the selective hydrogenation of nitrocyclohexane to cyclohexanone oxime under mild conditions. Carbon nanotube‐supported palladium catalysts demonstrate better catalytic performance than activated carbon‐supported palladium catalysts in general because of their mesoporous structures, which are favorable supports for the accessibility of the reactants to the active sites and the product desorption from the catalyst. Hydrogen chemisorption, transmission electron microscopy and X‐ray photoelectron spectroscopy indicate that higher composition of Pd + on the catalyst surface, larger palladium surface area, and better palladium dispersion contribute to an increase in the activity and selectivity toward cyclohexanone oxime. In addition, single‐wall carbon nanotube‐supported palladium catalysts give the best result of 97.7 % conversion of nitrocyclohexane and 97.4 % selectivity toward cyclohexanone oxime. On the basis of the results of GC–MS and the designed experiments, a possible reaction scheme was proposed.