DRIFTS Studies of platinum based zirconia catalyst promoted with sodium discovered by combinatorial methods

PETR 136

John M. Pigos, jpigos@honda-ri.com1, Christopher J. Brooks, cbrooks@oh.hra.com2, Gary Jacobs, jacobs@caer.uky.edu3, and Burtron H Davis, davis@caer.uky.edu3. (1) Honda Research Institute USA, Inc, 1381 Kinnear Rd., Columbus, OH 43212, (2) Honda Research Institute, 1381 Kinnear Road, Columbus, OH 43212, (3) Center for Applied Energy Research, University of Kentucky, 2540 Research Park Drive, Lexington, KY 40511
Through combinatorial catalytic testing, it was observed that the addition of Na to a Pt/ZrO2 catalyst enhanced the rate of the water-gas shifts reaction. DRIFTS analysis was performed on Pt/ZrO2 and PtNa/ZrO2 catalysts to better understand the effect of sodium. This included a CO adsorption study at 300 °C and a dynamic formate coverage studies done under steady state water-gas shift conditions at 225 °C. An empirical study of the formate and carbonate species was also carried out using reference materials to confirm assignments. The adsorption of CO at 300 °C displayed the C-H stretching of formate species for ZrO2, Pt/ZrO2 and PtNa/ZrO2. The C-H bands appearing at lower energy in the Na doped sample suggests a weakening of the C-H bond, the proposed rate-limiting step of the mechanism. Steady state shift testing at 225 °C showed that the coverage of formates was more limited for the PtNa/ZrO2 catalyst, indicating improved kinetics.

 

Fuel Processing for Hydrogen Production
1:30 PM-5:00 PM, Wednesday, 13 September 2006 Palace -- Presidio Room, Oral

Division of Petroleum Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006