Combining confinement and NO calcination to arrive at highly dispersed supported nickel and cobalt oxide catalysts with a tunable particle size

Control over the size and size distribution of supported nanoparticles is key to their efficient use in catalysis. In the preparation of nanoparticles by impregnation using nitrate precursors, the support pore diameter can be used to influence the average crystallite size. However, the particle size...

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Bibliographic Details
Published in:Catalysis today 2011-01, Vol.163 (1), p.27-32
Main Authors: Wolters, Mariska, van Grotel, Lotte J.W., Eggenhuisen, Tamara M., Sietsma, Jelle R.A., de Jong, Krijn P., de Jongh, Petra E.
Format: Article
Language:English
Subjects:
air
catalysts
catalytic activity
Cobalt
dispersions
Impregnation
Nanoparticles
Nickel
nitrates
Nitric oxide
particle size
particle size distribution
silica
Supported catalysts
thermal degradation
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Summary:Control over the size and size distribution of supported nanoparticles is key to their efficient use in catalysis. In the preparation of nanoparticles by impregnation using nitrate precursors, the support pore diameter can be used to influence the average crystallite size. However, the particle size distributions obtained via this method are generally broad and the dispersions relatively low. Higher dispersions and narrow particle size distributions are obtained via thermal decomposition of the metal nitrate precursor in 1% (v/v) NO in Ar instead of air. Here we will show that by combining the confinement effect of ordered mesoporous silica with a decomposition step of metal nitrates in NO, silica supported nickel and cobalt oxides with a tunable particle size (2–4 nm) can be obtained at high loadings (10–20 wt%).
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2010.02.052