Work during the last year (August 1991 to July 1992) has concentrated on completing the previously initiated studies of the surface chemistry of C{sub 1} oxygenates on particularly methanol SnO{sub 2}(110) and beginning studies of C{sub 2}oxygenate surface chemistry. During the remaining six months of the second budget period, the C{sub 2} studies will be continued.

Work during the last year (August 1991 to July 1992) has concentrated on completing the previously initiated studies of the surface chemistry of C{sub 1} oxygenates on particularly methanol SnO{sub 2}(110) and beginning studies of C{sub 2}oxygenate surface chemistry. During the remaining six months of the second budget period, the C{sub 2} studies will be continued.

Complete thermal desorption and photoemission studies of seven molecules (methanol, formaldehyde, formic acid, isopropanol, acetone, waste and carbon monoxide) have been completed on four different SnO{sub 2}(110) surfaces (stoichiometric, reduced, slightly-defective and highly-defective). Initial thermal desorption studies of acetic acid and propene have also been done. Results indicate that different initial surface conditions can dramatically affect: (1) probability for heterolytic dissociation of Bronsted acids, (2) reaction kinetics for unimolecular decomposition of oxygenated surface intermediates, and (3) product selectivity.