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Cu‐Decorated Ru Catalysts Supported on Layered Double Hydroxides for Selective Benzene Hydrogenation to Cyclohexene
Author(s) -
Liu Jie,
Xu Simin,
Bing Weihan,
Wang Fei,
Li Changming,
Wei Min,
Evans David G.,
Duan Xue
Publication year - 2015
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.201402895
Subject(s) - cyclohexene , catalysis , benzene , selectivity , adsorption , inorganic chemistry , ruthenium , chemistry , hydroxide , layered double hydroxides , desorption , yield (engineering) , materials science , organic chemistry , metallurgy
The selective hydrogenation of benzene to cyclohexene is of high value for the chemical industry owing to its inexpensive feedstock, atom economy, and operational simplicity. A tunable catalytic behavior towards the selective hydrogenation of benzene was obtained over Cu‐decorated Ru catalysts supported on a layered double hydroxide (denoted as Ru x Cu y /MgAl‐LDH), reaching a maximum cyclohexene yield of 44.0 % over Ru 1.0 Cu 0.5 /MgAl‐LDH at 150 °C and 5.0 MPa without employment of any additives. CO‐TPD (TPD=temperature‐programmed desorption) and in situ CO‐FTIR techniques demonstrated that Cu atoms preferentially deposit on the surface of low‐coordinated Ru atoms in Ru x Cu y /MgAl‐LDH catalysts, resulting in a low adsorption energy of cyclohexene on the modified sites as revealed by DFT calculations. This work not only gives an understanding of the correlation between the surface exposure of Ru active sites and the resulting selectivity, but also provides a green and additive‐free catalytic process for the selective hydrogenation of benzene.