Sr1-xMxTiO3 +/-delta (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 flaine-hydrolysis (FH) procedure. All the catalysts possessed the perovskite-like structure, with some SrCO3 as impurity with Sr0.9K0.1TiO3 +/-delta 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 degrees 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) Sr0.9K0.1TiO3 A sample.
|Titolo:||Effect of M ion oxidation state in Sr1-xMxTiO3 +/-delta perovskites in methane catalytic flameless combustion|
|Autori interni:||ROSSETTI, ILENIA GIUSEPPINA|
FORNI, LUCIO (Ultimo)
CAPPELLI, SERENA (Secondo)
|Parole Chiave:||SrKTiO3 and SrGdTiO3 oxidation catalysts; X-band and Q-band EPR; flame-hydrolysis preparation technique; oxygen-centred radicals|
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
|Data di pubblicazione:||2006|
|Data ahead of print:||27-ott-2005|
|Digital Object Identifier (DOI):||10.1016/j.molcata.2005.09.037|
|Appare nelle tipologie:||01 - Articolo su periodico|
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