期刊
NANO LETTERS
卷 16, 期 7, 页码 4528-4534出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01769
关键词
in situ microcopy; SMSI; Pd nanoparticles; TiO2
类别
资金
- Ford Motor Company
- National Science Foundation [CBET-1159240, DMR-0723032]
- U.S. Department of Energy, Basic Energy Sciences through SUNCAT Center for Interface Science and Catalysis
- School of Engineering at Stanford University through Terman fellowship
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1159240] Funding Source: National Science Foundation
Understanding the structures of catalysts under realistic conditions with atomic precision is crucial to design better materials for challenging transformations. Under reducing conditions, certain reducible supports migrate onto supported metallic particles and create strong metal support states that drastically change the reactivity of the systems. The details of this process are still unclear and preclude its thorough exploitation. Here, we report an atomic description of a palladium/titania (Pd/TiO2) system by combining state-of-the-art in situ transmission electron microscopy and density functional theory (DFT) calculations with structurally defined materials, in which we visualize the formation of the overlayers at the atomic scale under atmospheric pressure and high temperature. We show that an amorphous reduced titania layer is formed at low temperatures, and that crystallization of the layer into either mono- or bilayer structures is dictated by the reaction environment and predicted by theory. Furthermore, it occurs in combination with a dramatic reshaping of the metallic surface facets.
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