Active Interfacial Perimeter in Pt/CeO<sub>2</sub> Catalysts with Embedding Structure for Water-Tolerant Toluene Combustion
Menglan Xiao, Dawei Han, Xueqin Yang, Jing Yu, Bo Shi, Yucong Guo, Xiaolin Yu, Maofa Ge
Abstract
Supported Pt catalysts are often subjected to severe deactivation under the conditions of high temperature and water vapor in catalytic oxidation; thus, the superior stability and water-resistant ability of catalysts have great significance for the effective degradation of volatile organic compounds (VOCs). Herein, we constructed a Pt/CeO 2 -N catalyst with an active interfacial perimeter, in which Pt species were partially embedded in the defective CeO 2 -N support to prevent the sintering. A significant charge transfer between Pt species and ceria in the embedding structure occurred via the Pt-CeO 2 interface, which induced the formation of a Pt 4+ -O v -Ce 3+ interfacial structure. Experimental research and theoretical calculations demonstrated that the active Pt 4+ -O v -Ce 3+ interface promoted the activation and migration of lattice oxygen, thus facilitating the participation of oxygen species in toluene oxidation. Consequently, Pt/CeO 2 -N showed excellent catalytic performance for toluene degradation. In situ DRIFTS and DFT calculation proved that the Pt 4+ -Ov-Ce 3+ interfacial sites served as the intrinsic active center in the dissociation of H 2 O to generate ·OH, which contributed to the formation of benzaldehyde, thus remarkably improving the water-resistant property. This study provided a facile strategy for fabricating the interfacial embedding structure to enhance the catalytic activity and water tolerance for eliminating VOCs in practical application.