Pd–Ag@CeO2 Catalyst of Core–Shell Structure for Low Temperature Oxidation of Toluene Under Visible Light Irradiation
journal contributionposted on 26.12.2018, 00:00 by Jian Gao, Zhichun Si, Yunfan Xu, Liping Liu, Yuanyuan Zhang, Xiaodong Wu, Rui Ran, Duan Weng
Heterogeneous thermocatalysis is widely used for the removal of VOCs. However, it is energy-consuming because it must operate at high temperatures. Combining thermocatalysis with photocatalysis makes it possible for the efficient abatement of VOCs at low temperatures. In this work, Pd–Ag@CeO2 photothermal catalyst was synthesized via synthesizing ceria-coated Ag nanoparticles followed by loading Pd nanoparticles by the liquid-phase reduction method. The catalyst has a core–shell structure which induces strong electron interactions between Pd/Ag and CeO2 and significantly improves the light harvest, charge separation and dissociative adsorption of Pd–Ag@CeO2 in the visible region. The Pd–Ag@CeO2 catalyst has a good catalytic performance in toluene oxidation, showing the T50 of Pd–Ag@CeO2 at only 88 °C under visible light irradiation. Finally, the possible catalytic mechanism has also been proposed for the oxidation of toluene under visible light irradiation.