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Journal of Materials Chemistry A
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Nanoscale
ARTICLE
Three Co–Sn IMCs (Co2.9Sn2, CoSn and CoSn2) were prepared
by a modified impregnation-reduction method based on an
LDHs approach. The resulting catalysts exhibit largely-
enhanced catalytic selectivity for hydrogenation of citral to
unsaturated alcohol (5.2% for Co and more than 60% for Co–
Sn IMCs). H2-TPD measurements suggest the presence of four
different H–Co adsorption sites (α, β, γ and σ) on surface of
Co–Sn IMCs, and a good linear correlation is obtained between
the selectivity toward unsaturated alcohol and the ratio of β/
(γ + σ). The charge transfer from Sn to Co as well as the
isolation effect of Co active sites by Sn, as confirmed by the in
situ CO-IR, EXAFS and DFT calculations, lead to the formation
of Co–Sn coordination. This weakens the hydrogenation of C=C
bond, resulting in the enhanced selectivity. Our approach
holds significant promise for Co–Sn IMCs as efficient catalysts
toward selective hydrogenation of citral, and gives a deep
insight into the intrinsic structure-property relationship.
Evans and X. Duan, Chem. Mater., 2013, 25, 3888.
DOI: 10.1039/C6TA04542A
21 J. A. Lopez-Sanchez, N. Dimitratos, C. Hammond, G. L. Brett,
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,
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26 C. Li, Y. Chen, S. Zhang, J. Zhou, F. Wang, S. He, M. Wei, D. G.
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27 W. D. Shafer, G. Jacobs and B. H. Davis, ACS Catal., 2012, 2,
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30 B. Li, Y. Zhao, S. Zhang, W. Gao and M. Wei, ACS Appl. Mater.
Acknowledgements
This work was supported by the 973 Program (Grant No.
2014CB932104), the National Natural Science Foundation of
China, and the Specialized Research Fund for the Doctoral
Program of Higher Education (20130010110013). Author
thanks the support of BSRF (Bejing Synchrotron Radiation
Facility) during the XAFS measurements.
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