Pd–Ag@CeO₂ Catalyst of Core–Shell Structure for Low Temperature Oxidation of Toluene Under Visible Light Irradiation

Gao, Jian; Si, Zhichun; Xu, Yunfan; Liu, Liping; Zhang, Yuanyuan; Wu, Xiaodong; Ran, Rui; Weng, Duan

Pd–Ag@CeO₂ Catalyst of Core–Shell Structure for Low Temperature Oxidation of Toluene Under Visible Light Irradiation

2018

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.

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