COLL 178 |
| Eduardo E. Wolf, Department of Chemical Engineering, Department of Chemical Engineering, University of Notre Dame, Notre Dame, IN 46556 |
| In this talk, three examples describing the effect of catalyst finishing or pretreatment on the state of the surface and the catalysts’ activity are presented. First, we show the effect of Cl from the Pt precursor on Pt/Al2O3 catalysts during CO, methane and ethane oxidation. It was found that Cl blocks the surface inhibiting the oxidation rate and that the support plays a key role in storing Cl species that can migrate again onto the metal depending on pretreatment. Secondly, we present the site juxtaposition model showing that pretreatment is key in determining the high activity and resistance to deactivation of Pt modified sulfated zirconia catalysts. Thirdly, we show the effect of sulfur during CO oxidation on Pt supported catalysts and how it is altered by the choice of support and pretreatment. The state of the surface after various pretreatments is determined by in-situ IR and EXAFS spectroscopies. |
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The Science and Engineering of Catalyst Preparation
2:00 PM-5:25 PM, Monday, March 29, 2004 Marriott -- Orange County 3, Oral
Division of Colloid and Surface Chemistry |