A DRIFTS STUDY OF THE PARTIAL OXIDATION OF ETHANOL ON Rh CATALYSTS

作者：Oliveira Raquel Lima^*; Passos Fabio Barboza

来源：Quimica Nova, 2013, 36(3): 375-381.

• hydrogen
• rhodium
• ethanol

The partial oxidation of ethanol on gamma-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 H-2 by decomposition. The presence of CeO2 in the catalysts favored the oxidation steps due to its oxygen storage capacity.

• 出版日期2013