Novel synthesis of gold- and copper-doped cerium oxide nanocatalysts

CATL 2

Maria Flytzani-Stephanopoulos, maria.flytzani-stephanopoulos@tufts.edu1, Rui Si1, Weiling Deng1, Joan Raitano2, Sarbajit Banerjee2, Irving P. Herman, iph1@columbia.edu2, and Siu-Wai Chan2. (1) Department of Chemical and Biological Engineering, Tufts University, Medford, MA 02155, (2) Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027
Nanostructured ceria has been reported to promote the CO oxidation activity of metals, such as Pt, Au, and Cu, and to keep them in a highly dispersed state. How exactly this promotion takes place and how the composite system of M-O-Ce activates redox reactions, such as the water-gas shift (WGS) reaction, is currently under investigation. For the synthesis of metal (Au, Cu) doped ceria nanocrystals, one approach is to obtain homogeneous mixed metal hydroxides in solution by simultaneously precipitating the corresponding metal ions. Another approach involves direct metal ion doping of ceria nanocrystals during growth in the presence of an appropriate surfactant, which is also a template to control exposed ceria facets. In this presentation, the properties of gold- and copper-doped ceria-based (Au0.02Ce0.68Zr0.21La0.09Ox and Cu0.05Ce0.95Ox) nanocatalysts prepared by the above techniques will be shown. Catalytic activity for the CO oxidation and WGS reactions will be presented along with Raman scattering and sample reducibility analyses.

 

Nanotechnology in Catalysis V
9:00 AM-12:10 PM, Sunday, August 19, 2007 BCEC -- 261, Oral

Catalysis & Surface Science Secretariat

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007