Spillover of oxygen species in the steam reforming of propane on ceria-containing catalysts
Résumé
Several kinds of experiments were carried out to show that oxygen species (OH, O) can be transferred from a Rh/Al2O3 (RhA) catalyst to pure oxides and vice-versa. Ceria physically mixed with RhA increases the catalytic activity of the Rh catalyst for the steam reforming of propane. Conversely, RhA can promote the exchange of 18O2 with the 16O of pure oxides, normally inactive for the 18O/16O exchange in the absence of RhA. Moreover, large amounts of steam reforming products (H2, CO) were obtained by injecting pulses of pure propane over a PtRh/CeO2/Al2O3 catalyst. OH groups stored on the support migrate to the metal particles where the reaction with CHx fragments (issued from the C3H8 activation) can occur.