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Synergistic effect of segregated Pd and Au nanoparticles on semiconducting SiC for efficient photocatalytic hydrogenation of nitroarenes

Hao, Cai-Hong, Guo, Xiao-Ning, Meenakshisundaram, Sankar, Yang, Hong, Ma, Ben, Zhang, Yue-Fei, Tong, Xi-Li, Jin, Guo-Qiang and Guo, Xiang-Yun 2018. Synergistic effect of segregated Pd and Au nanoparticles on semiconducting SiC for efficient photocatalytic hydrogenation of nitroarenes. ACS Applied Materials and Interfaces 10 (27) , pp. 23029-23036. 10.1021/acsami.8b04044

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Abstract

Efficient catalytic hydrogenation of nitroarenes to anilines with molecular hydrogen at room temperature is still a challenge. In this study, this transformation was achieved by using a photocatalyst of SiC-supported segregated Pd and Au nanoparticles. Under visible-light irradiation, the nitrobenzene hydrogenation reached a turnover frequency as high as 1715 h–1 at 25 °C and 0.1 MPa of H2 pressure. This exceptional catalytic activity is attributed to a synergistic effect of Pd and Au nanoparticles on the semiconducting SiC, which is different from the known electronic or ensemble effects in Pd–Au catalysts. This kind of synergism originates from the plasmonic electron injection of Au and the Mott–Schottky contact at the interface between Pd and SiC. This three-component system changes the electronic structures of the SiC surface and produces more active sites to accommodate the active hydrogen that spills over from the surface of Pd. These active hydrogen species have weaker interactions with the SiC surface and thus are more mobile than on an inert support, resulting in an ease in reacting with the N═O bonds in nitrobenzene absorbed on SiC to produce aniline.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: American Chemical Society
ISSN: 1944-8244
Date of First Compliant Deposit: 11 July 2018
Date of Acceptance: 19 June 2018
Last Modified: 30 Jun 2019 20:21
URI: http://orca.cf.ac.uk/id/eprint/113137

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