OA10 Improved surface/bulk oxygen mobility suggested by TPR-XANES over Ca-doped Pt/ceria catalysts and implications for diffusion of O-bound species in LTS

Monday, June 6, 2011: 2:30 PM
Cabot Ballroom (Detroit Marriott Hotel at the Renaissance Center )
Gary Jacobs1, Linda Linganiso1, Burtron H. Davis1, Donald C. Cronauer2, A. Jeremy Kropf2 and Christopher L. Marshall3, (1)Center for Applied Energy Research, University of Kentucky, Lexington, KY, (2)Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL, (3)Chemical Science and Engineering Division, Argonne National Laboratory, Argonne, IL
Surface diffusion modelling suggests increasing O-surface diffusion improves the mobility of O-bound intermediates (formates, carbonates, carboxylates) during WGS.  Computer simulations reveal doping ceria with Ca should enhance both reducibility and O-mobility.  Employing TPR-XANES, Ca-doping facilitates reduction of Pt/ceria, while DRIFTS demonstrates improved formate decomposition rates.  Higher conversions obtained in testing.

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