Surface Science Model Studies for Flue Gas Cleanup Process in CuO and Fe sub 2 O sub 3 . Technical Progress Report, December 1985-February 1986

摘要

During the reporting period the High Pressure XPS system was further characterized and the optimum measuring condition under pressures at p approx. 1 mbar were determined. Studies on the interaction of SO sub 2 and O sub 2 with a Cu(111) surface were performed and the stability range with respect to temperature and coverage of CuSO sub 4 surface species was determined. It was found, that CuSO sub 4 surface species are only at T < 400 deg C, and that they always coexist with Cu/sub x/S and Cu/sub x/O. Slow decomposition was observed to start at T > 200 deg C. Exposure of SO sub 2 to a clean or oxidized Cu(111) surface at room temperature lead at SO sub 2 exposure greater than 120 x 10 sup -6 mbar-sec to the depletion of SO sub 4 surface species and the formation of coppersulfide. (ERA citation 11:026866)