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Confinement Impact for the Dynamics of Supported Metal Nanocatalyst
Author(s) -
Liu Huimin,
Wang Hui,
Liu Zongwen,
Ling Huajuan,
Zhou Cuifeng,
Li Huawei,
Stampfl Catherine,
Liao Xiaozhou,
Wang Jiuling,
Shi Xinghua,
Huang Jun
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201801586
Subject(s) - nanomaterial based catalyst , materials science , nanoparticle , nanoporous , nanotechnology , amorphous solid , catalysis , porosity , transmission electron microscopy , sintering , nanopore , particle (ecology) , chemical engineering , composite material , chemistry , crystallography , biochemistry , oceanography , geology , engineering
Supported metal nanoparticles play key roles in nanoelectronics, sensors, energy storage/conversion, and catalysts for the sustainable production of fuels and chemicals. Direct observation of the dynamic processes of nanocatalysts at high temperatures and the confinement of supports is of great significance to investigate nanoparticle structure and functions for practical utilization. Here, in situ high‐resolution transmission electron microscopy photos and videos are combined with dynamics simulations to reveal the real‐time dynamic behavior of Pt nanocatalysts at operation temperatures. Amorphous Pt surface on moving and deforming particles is the working structure during the high operation temperature rather than a static crystal surface and immobilization on supports as proposed before. The free rearrangement of the shape of Pt nanoparticles allows them to pass through narrow windows, which is generally considered to immobilize the particles. The Pt particles, no matter what their sizes, prefer to stay inside nanopores even when they are fast moving near an opening at temperatures up to 900 °C. The porous confinement also blocks the sintering of the particles under the confinement size of pores. These contribute to the continuous high activity and stability of Pt nanocatalysts inside nanoporous supports during a long‐term evaluation of catalytic reforming reaction.