Abstract
Catalytic performance of binary nanostructured oxides has been evaluated
in the gas-phase dehydration of glycerol, an environmental friendly
reaction. SnO2-Mn2O3, SnO2-ZrO2, SnO2-TiO2, ZrO2-Mn2O3 nanocasted
oxides, and a reference, NiO-Co3O4, were characterised by XRD, Raman
spectroscopy, acid-base measurements, SEM-EDX, TPR, HTEM and XPS.
Correlations among the catalyst's activity and the surface, textural,
and acid-base properties of the nanocasted oxides were tentatively
conducted in attempts to justify the catalytic results. Influences of
nanoparticle or nanostructure structural properties on the catalytic
activity have been investigated. The better activity of SnO2-TiO2 at 250
degrees C and a glycerol/water molar ratio of 0.25 was due to
cooperativity of Sn4+ and Ti4+. The most important finding was that
nanostructure features of the solid enhanced nanoparticle stability
through the redox ability of the binary solid compared to conventional
binary catalysts. (C) 2011 Elsevier B.V. All rights reserved.
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