CO2 reforming of CH4 on doped Rh/Al2O3 catalysts

The reforming of methane with carbon dioxide has been investigated at 773 K on Rh/Al2O3 promoted with TiO2 and V2O5. In addition, the dissociation of carbon dioxide and methane has also been examined. TPR and XPS results revealed that during the pre-treatment of the catalysts not only Rh reduced but also TiO2 slightly and V2O5 significantly to V4+ below 600 K. The dissociation of carbon dioxide occurred most easily on vanadia promoted catalyst. Vanadia and titania promoted Rh/Al2O3 was found to be more active in the CO2 + CH4 reaction than the Rh/Al2O3. The increase of the conversion observed on V2O5 and TiO2 promoted Rh/Al2O3 catalysts could be attributed to the oxygen vacancies which formed on the additives during the pretreatment and the reaction.

The reforming of CH4 with CO2 has been investigated at 773 K on Rh/Al2O3 promoted with TiO2 and V2O5. In addition, the dissociation of CO2 and CH4 has also been examined. TPR and XPS results revealed that during the pre-treatment not only Rh reduced but also TiO2 slightly and V2O5 significantly to V4+ below 600 K. The dissociation of CO2 occurred most easily on vanadia promoted catalyst. V2O5 and TiO2 promoted Rh/Al2O3 were found to be more active in the CO2 + CH4 reaction than the Rh/Al2O3. The increase of the conversion observed on these samples could be attributed to the oxygen vacancies which formed on the additives during the pretreatment and the reaction.Figure optionsDownload high-quality image (235 K)Download as PowerPoint slide