CATL 17 |
| This talk will focus on a series of studies investigating the water-gas shift (WGS) reaction over gold, copper and platinum nanoparticles in contact with surfaces of zinc oxide, ceria and titania. Currently, the primary source of hydrogen is by steam reforming from hydrocarbons. The reformed fuel contains 1-10% of CO, which degrades the performance of the Pt electrode used in fuel cell systems. Nowadays, the WGS reaction is critical for providing clean hydrogen. Using in-situ time-resolved X-ray diffraction and X-ray absorption near-edge spectroscopy we have identified the active phase for the WGS on several metal/oxide powder catalysts. Work with well-defined model catalysts has allowed us to study the effects of metal particle size and oxide support on the reaction mechanism. Trends in reactivity have been explained using density-functional calculations and a micro-kinetic model. |
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Nanotechnology in Catalysis V
1:30 PM-4:50 PM, Sunday, August 19, 2007 BCEC -- 261, Oral
Catalysis & Surface Science Secretariat |