Abstract
Sr 1− x M x TiO 3± δ ( x = 0 or 0.1; M = K or Gd) have been compared as catalysts for the flameless combustion of methane. The samples were prepared both by traditional sol–gel (SG) and by flame-hydrolysis (FH) procedure. All the catalysts possessed the perovskite-like structure, with some SrCO 3 as impurity with Sr 0.9K 0.1TiO 3± δ prepared by SG procedure. All the samples prepared by FH were better catalysts than those prepared by SG. A further improvement in the catalytic activity was obtained with M = K, but only at temperatures lower than 550 °C. X-band and Q-band EPR spectroscopies provided an explanation of this observation, based on the high mobility of surface O 3 − species on the surface of the (FH) Sr 0.9K 0.1TiO 3± δ sample.
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