Surface Chemistry of Model Co-Mo Catalysts Supported on Planar gamma -Al (sub 2)O (sub 3): Quarterly Technical Progress Report, March 1, 1988-May 31, 1988.

摘要

This quarter, we have done some TPD work on our planar model catalysts and a planar aluminum oxide support. Benzene showed a single desorption peak at 373 K on a planar alumina support. However, when benzene was adsorbed on calcined planar model catalyst, there was a broad unresolved peak starting around 450 K and leveling off around 680 K. Benzene appears to decompose on the calcined catalyst as indicated by a single weak desorption peak at 380 K. The high temperature peak was very small or absent depending on the surface coverage of the previous TPD run. In collaboration with Prof. J.M. White at the University of Texas at Austin, we have started work on planar model catalysts grown on single crystal Al(110) surfaces. In this study our objective is to investigate the effects of preferred crystal orientation on the catalytic properties. In Ford's lab, the new laser has been installed and made operational for second harmonic surface studies. Oxygen adsorption on Al(lll) has been studied using kelvin probe and second harmonic generation. As was mentioned in the last quarter's report, Wade Brown (graduate student) is writing his master's thesis. The future work for the next quarter includes the continuation of the adsorption studies and oxidation characteristics of the (lll) aluminum. (ERA citation 13:048040)