Oxidative Steam Reforming of Ethanol over Ni-Cu/SiO2, Rh/Al2O3 and Ir/CeO2: Effect of Metal and Support on Reaction Mechanism

O. Akdim , W. J. Cai (1) , Vanessa Fierro , H. Provendier (1) , A. van Veen (1) , W. J. Shen , C. Mirodatos (1)

1 IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon

The effect of metal and support on ethanol oxidative steam reforming (OSR) has been investigated over a series of stable and active catalytic systems with noble (Rh or Ir) and non noble metal (Ni-Cu) supported over neutral (SiO2), amphoteric (Al2O3) or redox (CeO2) supports. Ethanol decomposition and oxidative steam reforming was investigated by in situ diffuse reflectance infrared spectroscopy under temperature-programmed desorption and surface reaction conditions. Different mechanisms were established for these systems, from the initial steps of ethanol activation to the final equilibration of the decomposition products CO, CO2, H-2 and H2O. Various intermediates such as formates, acetates and/or carbonates were found to play different roles depending on the catalyst composition. The stability and activity of the investigated systems were finally assigned to specific features of these mechanisms.

Domaines: Catalyse

O. Akdim, W. J. Cai, Vanessa Fierro, H. Provendier, A. van Veen, et al.. Oxidative Steam Reforming of Ethanol over Ni-Cu/SiO2, Rh/Al2O3 and Ir/CeO2: Effect of Metal and Support on Reaction Mechanism. Topics in Catalysis, 2008, 51 (1-4), pp.22-38. ⟨10.1007/s11244-008-9122-z⟩. ⟨hal-00474580⟩