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Supported heterogeneous catalysts: what controls cobalt nanoparticle dispersion on alumina?

Loedolff, MJ, Goh, B-M, Koutsantonis, GA and Fuller, RO ORCID: 0000-0003-3926-8680 2018 , 'Supported heterogeneous catalysts: what controls cobalt nanoparticle dispersion on alumina?' , New Journal of Chemistry, vol. 42, no. 18 , pp. 14894-14900 , doi: 10.1039/c8nj03076f.

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Abstract

We investigate how a number of physical parameters control the rate and pattern of nanoparticle assemblage onto a commercially available alumina surface. 8 nm ε-Co nanoparticles supported on polycrystalline alumina are found to have areas of both good dispersion and areas of aggregation. A similar pattern of dispersion was also observed for larger (∼30 nm) polycrystalline ferromagnetic ε-Co nanoparticles. Acid and base treatment of the amphoteric support material prior to the assemblage process is found to have little impact on dispersion of the particles. Using a nonpolar solvent for the assemblage process eliminates the effect of zeta potential and allows for rapid attachment of particles to the support. Performing the assemblage in a polar solvent is found to significantly decrease the rate of the particle attachment to the support. Despite the slower attachment of particles, there is no impact on the nanoparticle distribution pattern. In contrast to the mixed dispersion observed when assembling nanoparticles on an alumina support, ε-Co nanoparticles are found to disperse uniformly across an ordered mesoporous MCM-41 silica support. It seems likely that a specific chemical interaction between the support surface and nanoparticle are dictating the assemblage process.

Item Type: Article
Authors/Creators:Loedolff, MJ and Goh, B-M and Koutsantonis, GA and Fuller, RO
Journal or Publication Title: New Journal of Chemistry
Publisher: Royal Soc Chemistry
ISSN: 1144-0546
DOI / ID Number: 10.1039/c8nj03076f
Copyright Information:

© The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2018

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