Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Site Tools

  • AAAS
  • Subscribe
  • Feedback

Site Search

Search Advanced

Published Online July 3, 2003
Science DOI: 10.1126/science.1085721

Reports

Submitted on April 15, 2003
Accepted on June 18, 2003

Active Nonmetallic Au and Pt Species on Ceria-Based Water-Gas Shift Catalysts

Qi Fu 1, Howard Saltsburg 1, Maria Flytzani-Stephanopoulos 1*

1 Department of Chemical and Biological Engineering, Tufts University, Medford, MA 02155, USA.

* To whom correspondence should be addressed. E-mail: maria.flytzani-stephanopoulos{at}tufts.edu.

Traditional analysis of reactions catalyzed by supported metals involves the structure of the metallic particles. However, we report here that for the class of nanostructured Au- or Pt-cerium oxide catalysts, which are active for the water-gas shift reaction, metal nanoparticles do not participate in the reaction. Non-metallic Au or Pt species strongly associated with surface Ce-O groups are responsible for the activity.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Evolution of gold structure during thermal treatment of Au/FeOx catalysts revealed by aberration-corrected electron microscopy.
L. F. Allard, A. Borisevich, W. Deng, R. Si, M. Flytzani-Stephanopoulos, and S. H. Overbury (2009)
J. Electron Microsc. (Tokyo) 58, 199-212
   Abstract »    Full Text »    PDF »
High catalytic activity of Au/CeOx/TiO2(110) controlled by the nature of the mixed-metal oxide at the nanometer level.
J. B. Park, J. Graciani, J. Evans, D. Stacchiola, S. Ma, P. Liu, A. Nambu, J. F. Sanz, J. Hrbek, and J. A. Rodriguez (2009)
PNAS 106, 4975-4980
   Abstract »    Full Text »    PDF »
Activity of CeOx and TiOx Nanoparticles Grown on Au(111) in the Water-Gas Shift Reaction.
J. A. Rodriguez, S. Ma, P. Liu, J. Hrbek, J. Evans, and M. Perez (2007)
Science 318, 1757-1760
   Abstract »    Full Text »    PDF »
Enhanced Bonding of Gold Nanoparticles on Oxidized TiO2(110).
D. Matthey, J. G. Wang, S. Wendt, J. Matthiesen, R. Schaub, E. Laegsgaard, B. Hammer, and F. Besenbacher (2007)
Science 315, 1692-1696
   Abstract »    Full Text »    PDF »
Electron Localization Determines Defect Formation on Ceria Substrates.
F. Esch, S. Fabris, L. Zhou, T. Montini, C. Africh, P. Fornasiero, G. Comelli, and R. Rosei (2005)
Science 309, 752-755
   Abstract »    Full Text »    PDF »
Powering Fuel Cells with CO via Aqueous Polyoxometalates and Gold Catalysts.
W. B. Kim, T. Voitl, G. J. Rodriguez-Rivera, and J. A. Dumesic (2004)
Science 305, 1280-1283
   Abstract »    Full Text »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)