Abstract
BaTi 1− x In x O 3− δ perovskites (called BIT x) were evaluated as supports of nickel catalysts for methane oxidation in the absence of gas-phase oxygen. Ni/BaTi 1− x In x O 3− δ ( x = 0 and 0.3) catalysts were studied, by temperature programmed surface reaction of methane (TPSR-CH 4) and pulses at 850 °C. In these conditions, the only oxygen source is the oxide bulk support. TPSR-CH 4 results suggest that the support is able to oxidize the methane producing H 2 and CO at temperatures above 750 °C. Ni/BT and Ni/BIT0.7 catalysts, showed a high selectivity towards partial oxidation products. Ni/BIT0.7 catalyst was more stable than Ni/BT due to the existence of Ni–In alloys which catalyze less the cracking reaction. Moreover, the higher ionic conductivity of BIT0.7 facilitates the O 2− ions diffusion to the surface and promotes the oxidation of carbonaceous deposits formed on the metal–support interface preventing thus catalyst deactivation.
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