COLL 33 |
| Michael S. Wong1, William V. Knowles2, J. M. Jehng3, Xiang Wang4, Tae Jin Kim4, Liz Ross4, and Israel E. Wachs4. (1) Department of Chemical Engineering and Department of Chemistry, William M. Rice University, 6100 Main St., MS-362, Houston, TX 77251-1892, (2) Department of Chemical Engineering, Rice University, 6100 Main St., MS-362, Houston, TX 77251-1892, (3) Department of Chemical Engineering, National Chung-Hsing University, Taichung 402, Taiwan, China, (4) Operando Molecular Spectroscopy and Catalysis Laboratory, Department of Chemical Engineering, Lehigh University, 7 Asa Drive, Bethlehem, PA 18015 |
| The ever-constant pursuit of improving activity, selectivity, and deactivation resistance of heterogeneous catalysts is facilitated through the design and development of new catalyst structures. Specifically, supported metal oxide materials play a tremendous role in catalytic processes in bulk chemical, petrochemical, pharmaceutical, and environmental applications. We have found that re-designing supported metal oxide catalysts through the use of nanoparticles (NPs) as the support material leads to the unexpected generation of highly polymerized metal oxo surface species. These easily reducible polymerized species can be exploited for reactions in which a reduction step is required to form an active catalyst, such as acid-catalyzed dehydration (by nano-WOx/ZrO2) and oxidative dehydrogenation (by nano-VOx/ZrO2). The molecular-level synthesis of these thermally stable, mesoporous catalysts is achieved through surfactant templating chemistry. In this talk, we will present the bottom-up synthesis, molecular and bulk structural characterization, and catalytic properties of these novel nano-supported metal oxide materials. |
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The Science and Engineering of Catalyst Preparation
8:30 AM-11:55 AM, Sunday, March 28, 2004 Marriott -- Orange County 3, Oral
Division of Colloid and Surface Chemistry |