EPR spectroscopy revealing the mechanism of methane flameless combustion catalyzed by La0.9M0.1CoO3 (M = Eu, Ce)

Oliva, Cesare; Forni, L.

doi:10.1007/bf03162294

Cited by 1 publication

(1 citation statement)

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“…Several kinds of mixed oxides have been prepared and tested by our research group since the late nineties, by using the CFC of methane as test reaction and focusing particularly on A1-xA'xBO3 (A = La, Sr; A' = Ce, Eu, Sr; B = Co, Mn, Fe, Ni) perovskitestructured oxides [8][9][10][11][12][13][14][15][16][17]. During this work, besides employing the traditional calcinationmilling [18] and sol-gel-citrates (SGC) [19] methods, an innovative flame hydrolysis (FH) preparation procedure has been proposed by us [11] and, more recently, also the flamespray pyrolysis (FP) method [20,21] is being applied.…”

Section: Introductionmentioning

confidence: 99%

SrAgTiO (, 0.1) perovskite-structured catalysts for the flameless combustion of methane

Fabbrini

Kryukov

Cappelli

et al. 2005

Journal of Catalysis

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Several samples of Sr1-xAgxTiO3 (x = 0, 0.1) perovskite-structured catalysts have been prepared and tested for the title reaction under lean-burn conditions. For the same overall nominal composition, catalyst activity and durability depend strongly on the method of preparation and, for the samples prepared by the same method, mainly on temperature and on residence time at such a temperature during preparation. In Sr0.9Ag0.1TiO3 catalysts Ag is present either as intra-crystalline Ag 2+ , likely substituting for Sr 2+ in the perovskite lattice, or as inter-crystalline metallic Ag. The catalytic activity of Sr0.9Ag0.1TiO3 is connected with the presence of O2 -/Ti 4+ , Ox -/Ag and Ox -/Ag 2+ or of O3 -/Ti 4+ , O -/Sr 2+ and of O -/Ti 4+ species, depending on preparation method and conditions. Furthermore, intercrystalline metallic Ag plays an important role in improving catalyst resistance to sintering, the most durable samples being those calcined for a sufficient residence time at the highest temperature during preparation, i.e. under conditions better favouring the segregation of this metal from the perovskite lattice.

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