Revealing particle growth mechanisms by combining high-surface-area catalysts made with monodisperse particles and electron microscopy conducted at atmospheric pressure
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- 作者：Shuyi Zhanga ; b ; Matteo Cargnelloc ; d ; Wei Caia ; Christopher B. Murrayc ; e ; George W. Grahama ; gwgraham@umich.edu" class="auth_mail" title="E-mail the corresponding author ; Xiaoqing Pana ; b ; f ; xiaoqing.pan@uci.edu" class="auth_mail" title="E-mail the corresponding author
- 关键词：In situ electron microscopy ; Monodispersed Pt nanoparticles ; Ostwald ripening ; Particle migration and coalescence ; High-surface-area Al2O3
- 刊名：Journal of Catalysis
- 出版年：2016
- 出版时间：May 2016
- 年：2016
- 卷：337
- 期：Complete
- 页码：240-247
- 全文大小：3091 K
文摘
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Coarsening of size selected Pt nanoparticles on γ-Al2O3 was studied by in situ STEM.
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Ostwald ripening under forming gas was effectively suppressed by size selection.
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Without size selection, Ostwald ripening dominated particle migration/coalescence.
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The particle diffusion coefficient of 2 nm Pt particles was unexpectedly small.