Facet‐Dependent Oxidative Strong Metal‐Support Interactions of Palladium–TiO2 Determined by In Situ Transmission Electron Microscopy. Issue 41 (3rd September 2021)

• Record Type: Journal Article
• Authors: Tang, Min; Li, Songda; Chen, Shiyuan; Ou, Yang; Hiroaki, Matsumoto; Yuan, Wentao; Zhu, Beien; Yang, Hangsheng; Gao, Yi; Zhang, Ze; Wang, Yong
• Is Part Of: Angewandte Chemie international edition. Volume 60:Issue 41(2021)
• Page Start: 22339
• Page End: 22344
• Publication Date: 2021-09-03
• Subjects: facet-dependent interactions -- in situ TEM -- methane combustion -- oxidative interactions -- Pd-TiO2; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202106805
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The strong metal‐support interaction (SMSI) is widely used in supported metal catalysts and extensive studies have been performed to understand it. Although considerable progress has been achieved, the surface structure of the support, as an important influencing factor, is usually ignored. We report a facet‐dependent SMSI of Pd‐TiO2 in oxygen by using in situ atmospheric pressure TEM. Pd NPs supported on TiO2 (101) and (100) surfaces showed encapsulation. In contrast, no such cover layer was observed in Pd‐TiO2 (001) catalyst under the same conditions. This facet‐dependent SMSI, which originates from the variable surface structure of the support, was demonstrated in a probe reaction of methane combustion catalyzed by Pd‐TiO2 . Our discovery of the oxidative facet‐dependent SMSI gives direct evidence of the important role of the support surface structure in SMSI and provides a new way to tune the interaction between metal NPs and the support as well as catalytic activity. Abstract : The strong metal‐support interaction (SMSI) of well‐defined Pd‐TiO2 catalysts under high‐temperature oxidation was studied via in situ atmospheric pressure TEM. On the different facets of TiO2 supports there were significant differences in the encapsulation behaviors with a facet‐dependent SMSI. Obvious cover layers were observed on Pd NPs supported on TiO2 (101) and (100) facets, while no such phenomenon appeared on TiO2 (001) facets.