Clemmer, PG
1992
Molybdena, Ceria, and Niobia Addition to Supported Rh Catalysts: Effects on NO Reduction by CO
Hecker, W.C.; Wardinsky, M.D.; Clemmer, P.G. and Rasband, P.B.
Proceedings of the Twelfth Canadian Symposium on Catalysis, 211-218, Alberta, Canada, May 1992. Funded by Brigham Young Unversity.
The kinetics of the reduction of NO by CO over Rh/molybdena/silica, Rh/ceria/silica, Rh/niobia/silica, and Rh/ceria/alumina catalysts have been studied. Catalysts have been characterized using H2 chemisorption and quantitative FTIR techniques for dispersion determination, and using in-situ and post reaction FTIR spectroscopy for site distribution study. The chief effect of molybdena, ceria, and niobia addition under the conditions of this study appears to be in the alteration of effective Rh particle size (dispersion) although Mo addition does seem to more directly affect catalyst activity. A plot of turnover does seem to more directly affect catalyst activity. A plot of turnover frequency versus Rh particle ize shows that all of the catalysts with the exception of the Rh/molybdena/silica exhibit a common structure sensitivity. This sensitivity has been explained qualitatively through mechanistic arguments.
Clemmer, PG
1992
Molybdena, Ceria, and Niobia Addition to Supported Rh Catalysts: Effects on NO Reduction by CO
Hecker, W.C.; Wardinsky, M.D.; Clemmer, P.G. and Rasband, P.B.
Proceedings of the Twelfth Canadian Symposium on Catalysis, 211-218, Alberta, Canada, May 1992. Funded by Brigham Young Unversity.
The kinetics of the reduction of NO by CO over Rh/molybdena/silica, Rh/ceria/silica, Rh/niobia/silica, and Rh/ceria/alumina catalysts have been studied. Catalysts have been characterized using H2 chemisorption and quantitative FTIR techniques for dispersion determination, and using in-situ and post reaction FTIR spectroscopy for site distribution study. The chief effect of molybdena, ceria, and niobia addition under the conditions of this study appears to be in the alteration of effective Rh particle size (dispersion) although Mo addition does seem to more directly affect catalyst activity. A plot of turnover does seem to more directly affect catalyst activity. A plot of turnover frequency versus Rh particle ize shows that all of the catalysts with the exception of the Rh/molybdena/silica exhibit a common structure sensitivity. This sensitivity has been explained qualitatively through mechanistic arguments.