Two bimetallic Pd-Pt catalysts were prepared by wash-coating the composites of Pd-Pt/CeZrO2-Al2O3 onto cordierite monolith and they were evaluated in a tubular reactor for stability in combustion of SOFC stack flue gas at GHSV 29,280 h-1 and 1 atm. The Pd-rich catalyst showed better stability than the Pt-rich catalyst for combustion of the wet feed. Water vapor in the stack flue gas affected the catalyst activity adversely via the formation of inactive Pd(OH)2_x000D_ species at the reaction temperatures of 723 and 823 K, but this effect was eliminated by raising the temperature to 923 K or above. Catalyst properties such as specific surface area, pore size and metal dispersion did not deteriorate significantly after combustion of the wet feed in the temperature range of 723-1,023 K. The presence of CeZrO2 in Al2O3 material was considered to affect the support properties favorably, leading to a kind of metal-support interaction beneficial for_x000D_ the combustion of the wet feed. This interaction helped to enable the Pd-Pt catalysts to maintain good stability for combusting the wet SOFC stack flue gas with the stoichiometric air-to-fuel ratio at 923 K or above.

SOFC Stack Flue Gas Combustion Bimetallic Pd-Pt Catalyst CeZrO2-Al2O3 Support Water Vapor and Temperature Effects Catalyst Stability

Hori CE, Permana H, Ng KYS, Brenner A, More K, Rahmoeller KM, Belton D, Appl. Catal. B: Environ., 16(2), 105 (1998)
Wang S, Zhang X, Zhao Y, Ge Y, Lv J, Wang B, Ma X, Front. Chem. Sci. Eng., 6(3), 259 (2012)
Ahlstromsilversand AF, Odenbrand CU, Appl. Catal. A: Gen., 153(1-2), 157 (1997)
Hurtado P, Ordonez S, Sastre H, Diez FV, Appl. Catal. B: Environ., 47(2), 85 (2004)
Gao J, Wang Y, Ping Y, Hu D, Xu G, Gu F, Su F, RSC Adv., 2, 2358 (2012)