Enthalpy recovery of gases issued from H2 production processes: Activity and stability of oxide and noble metal catalysts in oxidation reaction under highly severe conditions

摘要: Abstract Oxidation activity and stability under reaction was investigated for a series of mixed oxide catalysts, doped or not by precious metal (Pd, Pt). The feedstock, containing CO, H 2 , CH 4 CO O, simulated gases issued from production processes fuel cells. Contrarily to conventional noble samples present generally good at high temperature. activities measured the perovskite hexaaluminate are however largely lower than that reference Pd/Al O 3 catalyst. High were obtained after impregnation 1.1 wt.% Pd 0.8 wt.% Pt on hexaaluminates samples. Even if found activity, this sample suffered drastic deactivation 700 °C. Better perovskite. Furthermore, doping led with stability. better Pd, Pd/BaAl 12 19 strongly deactivated, as it previously observed Interestingly, when impregnated Mn substituted hexaaluminate, leading stable active This suggests is possible stabilize palladium in its oxidized form temperature (700 °C) surface some supports.