Dz. Wang et al., REACTION-MECHANISM AND ROLE OF THE SUPPORT IN THE PARTIAL OXIDATION OF METHANE ON RH AL2O3/, Journal of catalysis, 159(2), 1996, pp. 418-426
The partial oxidation of CH4 over Rh/Al2O3 was studied by means of tem
poral analysis of products (TAP). CH4 was found to adsorb dissociative
ly on reduced metal sites. Oxygen preadsorption decreases the methane
adsorption rate. The oxidation products under oxidative conditions are
CO2 and H2O. The selectivity towards CO and H-2 rises to almost 100%
as the conditions become more reductive. Water adsorbed on the support
acts as an oxygen source through the inverse spillover of water or hy
droxyl onto the Rh particles. A reaction scheme for the partial oxidat
ion of methane is presented and the elementary reactions that give ove
rall steam reforming, CO2 reforming, and water-gas shift are discussed
. (C) 1996 Academic Press, Inc.