Autor(es):
Vasconcelos, Santiago J. S. ; Lima, Cleanio L. ; M. Filho, Josué ; Oliveira, Alcemira Conceição ; Barros, Eduardo B. ; Sousa, Francisco F. de ; Rocha, Maria da Graça Martins Carneiro da ; Bargiela, Pascal ; Oliveira, Alcineia Conceição ; Vasconcelos, Santiago J. S. ; Lima, Cleanio L. ; M. Filho, Josué ; Oliveira, Alcemira Conceição ; Barros, Eduardo B. ; Sousa, Francisco F. de ; Rocha, Maria da Graça Martins Carneiro da ; Bargiela, Pascal ; Oliveira, Alcineia Conceição
Data: 2012
Origem: Oasisbr
Assunto(s): Nanocasted oxides; Raman; Glycerol; Catalyst; Dehydration; Characterisation
Descrição
Acesso restrito: Texto completo. p. 656-664.
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A series of nanocasted oxides were synthesised, and an analysis using basicity measurements provided evidence that low strength basic sites with high accessibility favoured the production of 1-hydroxyacetone from glycerol dehydration. Among the oxides studied (e.g., CeO2, ZrO2, and TiO2), the best results were obtained for a CeO2–ZrO2 binary oxide (activity = 3×10−6 mmolg−1 h−1), which revealed that a moderate basicity allowed acid–base cooperativity in the Ce0.8Zr0.2O2 phase to produce 1-hydroxyacetone. Indeed, TEM, Raman, XPS and SEM-EDX analyses and textural properties showed that these features influenced the activity of the catalyst towards glycerol conversion by preventing coking.
