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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.


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