Origin of synergistic effects in bicomponent cobalt oxide-platinum catalysts for selective hydrogenation reaction

Jiankang Zhang, Zhe Gao (), Sen Wang, Guofu Wang, Xiaofeng Gao, Baiyan Zhang, Shuangfeng Xing, Shichao Zhao and Yong Qin ()
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Jiankang Zhang: Chinese Academy of Sciences
Zhe Gao: Chinese Academy of Sciences
Sen Wang: Chinese Academy of Sciences
Guofu Wang: Chinese Academy of Sciences
Xiaofeng Gao: Chinese Academy of Sciences
Baiyan Zhang: Chinese Academy of Sciences
Shuangfeng Xing: Chinese Academy of Sciences
Shichao Zhao: Chinese Academy of Sciences
Yong Qin: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract The synergistic nature of bicomponent catalysts remains a challenging issue, due to the difficulty in constructing well-defined catalytic systems. Here we study the origin of synergistic effects in CoOx-Pt catalysts for selective hydrogenation by designing a series of closely contacted CoOxPt/TiO2 and spatially separated CoOx/TiO2/Pt catalysts by atomic layer deposition (ALD). For CoOx/TiO2/Pt, CoOx and platinum are separated by the walls of titania nanotubes, and the CoOx-Pt intimacy can be precisely tuned. Like CoOxPt/TiO2, the CoOx/TiO2/Pt shows higher selectivity to cinnamyl alcohol than monometallic TiO2/Pt, indicating that the CoOx-Pt nanoscale intimacy almost has no influence on the selectivity. The enhanced selectivity is ascribed to the increased oxygen vacancy resulting from the promoted hydrogen spillover. Moreover, platinum-oxygen vacancy interfacial sites are identified as the active sites by selectively covering CoOx or platinum by ALD. Our study provides a guide for the understanding of synergistic nature in bicomponent and bifunctional catalysts.

Date: 2019
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DOI: 10.1038/s41467-019-11970-8

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