Journal
TOPICS IN CATALYSIS
Volume 55, Issue 7-10, Pages 571-579Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-012-9834-y
Keywords
Supported cobalt oxide; Oxidation reaction; Nanorod particles; Mesoporous silica SBA-15; Double-solvent; Spinel Co3O4
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Funding
- Australian Research Council [RIEFP 99]
- ARC COE for Design in Light Metals, Massimo Raveggi (School of Geosciences, Monash University)
- Monash Research Graduate School
- Faculty of Science, Monash University
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Mesoporous silica SBA-15 supported cobalt oxide composites prepared via the double-solvent, impregnation and adsorption techniques were characterized by diffuse reflectance UV-Vis (DR UV-Vis), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The potential of these cobalt modified composites to oxidize norbornene, benzyl alcohol and 1-phenylethanol was determined by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). SEM images indicated that, irrespective of cobalt content (Co-content), the integrity of the mesoporous channels remained intact for all methods. DR UV-Vis exhibited a red-shift which increased with Co-content for catalysts prepared by the double-solvent technique and is attributed to more extensive crystal growth. The morphology of the cobalt oxide species had a direct impact on the pore volume (Pv) and surface area (SA) of the composites and this, in turn affected the catalytic activity. For catalysts prepared by the double-solvent technique, the activity was in reverse proportion to the Co-content. This is attributed to reduced Pv which limits the active SA available.
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