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Controllable decoration of sub-nano palladium clusters on reduced graphene oxide with superior catalytic performance in selective oxidation of alcohols

Abstract

Nowadays it has received wide recognition that the performance of many catalytic materials is closely related to their particle size; however, it is still a great challenge to produce metal particles in sub-nano scale at low cost and in a facile way. In this work, uniformly dispersed palladium sub-nanoclusters were controllably decorated on reduced graphene oxide (Pd/rGO) by a facile modified impregnation method without using any protecting agents; a mean palladium cluster size of as low as 0.7–0.9 nm can be achieved by impregnation with PdCl2 as precursor, ethanol or acetone as solvent and calcination in hydrogen at low temperature. The Pd/rGO catalyst exhibits high activity in the aerobic oxidation of benzyl alcohol, with almost a complete alcohol conversion and selectivity of 100% to benzaldehyde at 60 °C; moreover, it also displays much higher stability against deactivation from the aggregation of Pd particles than the Pd catalyst with active carbon as support. The superior performance of Pd/rGO catalyst can be ascribed to the small size and high valence of Pd sub-nanoclusters, the coordination of chloride ions, as well as the strong interaction between Pd species and rGO support, as demonstrated by various characterization measures. These results help to clarify the relationship between the preparation, structure and performance of supported Pd/rGO catalyst in the selective oxidation of alcohols, which bring forward an effective approach to get sub-nano metal clusters on rGO with superior catalytic performance.

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Publication details

The article was received on 24 Aug 2017, accepted on 03 Oct 2017 and first published on 03 Oct 2017


Article type: Paper
DOI: 10.1039/C7CY01732D
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    Controllable decoration of sub-nano palladium clusters on reduced graphene oxide with superior catalytic performance in selective oxidation of alcohols

    L. Lei, Z. Wu, R. Wang, Z. Qin, C. Chen, Y. Liu, G. Wang, W. Fan and J. Wang, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY01732D

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