A DRIFTS study of the partial oxidation of ethanol on Rh catalysts

Química Nova

Oliveira, Raquel Lima¹  Universidade Federal Fluminense, Niterói, Brasil¹  Passos, Fabio Barboza¹ 

关键词: hydrogen;    rhodium;    ethanol.;   

DOI  :  10.1590/S0100-40422013000300005

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The partial oxidation of ethanol on γ-Al2O3, CeO2, ZrO2 and CexZr1-xO2 supported rhodium catalysts was investigated by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). The catalysts were characterized by temperature-programmed reduction (TPR) and cyclohexane dehydrogenation. DRIFTS studies on the partial oxidation of ethanol showed that ethanol is adsorbed dissociatively, through O-H bond breaking, with the formation of ethoxy species, followed by successive dehydrogenation to acetaldehyde and acetyl species. Further oxidation to acetate and carbonate species lead to the formation of CO, CH4 and H2 by decomposition. The presence of CeO2 in the catalysts favored the oxidation steps due to its oxygen storage capacity.

【 授权许可】

Unknown