Abstract
The partial oxidation of CH4over Rh/Al2O3was studied by means of temporal analysis of products (TAP). CH4was found to adsorb dissociatively on reduced metal sites. Oxygen preadsorption decreases the methane adsorption rate. The oxidation products under oxidative conditions are CO2and H2O. The selectivity towards CO and H2rises 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 hydroxyl onto the Rh particles. A reaction scheme for the partial oxidation of methane is presented and the elementary reactions that give overall steam reforming, CO2reforming, and water–gas shift are discussed.
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