奥斯特瓦尔德成熟
成核
聚结(物理)
催化作用
镍
材料科学
纳米颗粒
化学工程
水蒸气
粒径
透射电子显微镜
粒子(生态学)
金属
氢氧化物
纳米技术
化学
冶金
有机化学
工程类
物理
海洋学
天体生物学
地质学
作者
Savannah J. Turner,Nienke L. Visser,Remco Dalebout,Dennie Wezendonk,Petra E. de Jongh,K.P. de Jong
出处
期刊:Small
[Wiley]
日期:2024-03-29
标识
DOI:10.1002/smll.202401009
摘要
Unavoidable water formation during the reduction of solid catalyst precursors has long been known to influence the nanoparticle size and dispersion in the active catalyst. This in situ transmission electron microscopy study provides insight into the influence of water vapor at the nanoscale on the nucleation and growth of the nanoparticles (2-16 nm) during the reduction of a nickel phyllosilicate catalyst precursor under H2/Ar gas at 700 °C. Water suppresses and delays nucleation, but counterintuitively increases the rate of particle growth. After full reduction is achieved, water vapor significantly enhances Ostwald ripening which in turn increases the likelihood of particle coalescence. This study proposes that water leads to formation of mobile nickel hydroxide species, leading to faster rates of particle growth during and after reduction.
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