DYNAMICS OF SURFACE OXYGEN COMPLEXES DURING CARBON GASIFICATION WITH OXYGEN

The dynamic behavior of surface oxygen complexes formed during the gasification of carbon with isotopically labeled oxygen was studied by transient kinetics (TK). The surface oxygen complexes after the gasification were analyzed with temperature-programmed desorption (TPD). From the results of the TK and TPD, a detailed mass balance of oxygen during the gasification was established and the fate of each surface oxygen complex such as acid anhydride, lactone, carbonyl, or ether during the gasification was clarified. Furthermore, it was verified that carbonyl and ether produce CO2 and CO through the reaction with O-2, while acid anhydride and lactone desorb as CO2 (and CO) without direct interaction with O-2. As a whole, the formation of carbonyl and ether by O-2 chemisorption and their reaction with O-2 were found to be the main route for the carbon gasification with O-2 under the present conditions.