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Facet‐Dependent Oxidative Strong Metal‐Support Interactions of Palladium–TiO 2 Determined by In Situ Transmission Electron Microscopy
Author(s) -
Tang Min,
Li Songda,
Chen Shiyuan,
Ou Yang,
Hiroaki Matsumoto,
Yuan Wentao,
Zhu Beien,
Yang Hangsheng,
Gao Yi,
Zhang Ze,
Wang Yong
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202106805
Subject(s) - facet (psychology) , catalysis , palladium , transmission electron microscopy , metal , oxygen , chemical engineering , materials science , chemistry , nanotechnology , metallurgy , organic chemistry , psychology , social psychology , personality , engineering , big five personality traits
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‐TiO 2 in oxygen by using in situ atmospheric pressure TEM. Pd NPs supported on TiO 2 (101) and (100) surfaces showed encapsulation. In contrast, no such cover layer was observed in Pd‐TiO 2 (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‐TiO 2 . 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.