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Facile benzene reduction promoted by a synergistically coupled Cu–Co–Ce ternary mixed oxide

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Abstract

Hydrogenation of aromatic rings promoted by earth-abundant metal composites under mild conditions is an attractive and challenging subject in the long term. In this work, a simple active site creation and stabilization strategy was employed to obtain a Cu+-containing ternary mixed oxide catalyst. Simply by pre-treatment of the ternary metal oxide precursor under a H2 atmosphere, a Cu+-derived heterogeneous catalyst was obtained and denoted as Cu1Co5Ce5Ox. The catalyst showed (1) high Cu+ species content, (2) a uniform distribution of Cu+ doped into the lattices of CoOx and CeO2, (3) formation of CoOx/CuOx and CeO2/CuOx interfaces, and (4) a mesoporous structure. These unique properties of Cu1Co5Ce5Ox endow it with pretty high hydrogenation activity for aromatic rings under mild conditions (100 °C with 5 bar H2), which is much higher than that of the corresponding binary counterparts and even exceeds the performance of commercial noble metal catalysts (e.g. Pd/C). The synergetic effect plays a crucial role in the catalytic procedure with CeO2 functioning as a hydrogen dissociation and transfer medium, Cu+ hydrogenating the benzene ring and CoOx stabilizing the unstable Cu+ species. This will unlock a new opportunity to design highly efficient earth-abundant metal-derived heterogeneous catalysts via interface interactions.

Graphical abstract: Facile benzene reduction promoted by a synergistically coupled Cu–Co–Ce ternary mixed oxide

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Supplementary files

Article information


Submitted
20 Apr 2020
Accepted
14 May 2020
First published
22 May 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020, Advance Article
Article type
Edge Article

Facile benzene reduction promoted by a synergistically coupled Cu–Co–Ce ternary mixed oxide

H. Chen, W. Lin, Z. Zhang, Z. Yang, K. Jie, J. Fu, S. Yang and S. Dai, Chem. Sci., 2020, Advance Article , DOI: 10.1039/D0SC02238A

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