A few perovskite-like and fluorite-like samples in which M=Pr, Sm or Tb substitutes for La have been characterised by electron magnetic resonance (EMR) spectroscopy and other techniques. Ferromagnetic (FM) systems form with the fresh biphasic sample with M =Sm only, but not after recalcination, when it becomes monophasic. These systems could be formed of Magnetic Bound Polarons due to the thermally excited J=1 Sm2+ ions present as impurity in the former case. FM systems form also with the M = Tb sample, but only after catalytic use. In this case FM systems could be composed of Tb4+ ions forming during sample re-oxidation. All these EMR observations have been correlated with the catalytic performance of these samples.
EMR characterisation of La1.8M0.2CuO4 and La0.9M0.1CoO3 (M = Pr, Sm, Tb) catalysts for methane flameless combustion / C. Oliva, S. Cappelli, A. Kryukov, G.L. Chiarello, A.V. Vishniakov, L. Forni. - In: JOURNAL OF MOLECULAR CATALYSIS. A: CHEMICAL. - ISSN 1381-1169. - 247:1-2(2006), pp. 248-252.
|Titolo:||EMR characterisation of La1.8M0.2CuO4 and La0.9M0.1CoO3 (M = Pr, Sm, Tb) catalysts for methane flameless combustion|
OLIVA, CESARE (Primo)
CAPPELLI, SERENA (Secondo)
FORNI, LUCIO (Ultimo)
|Parole Chiave:||partially substituted perovskites ; partially substituted fluorites ; EPR ; ferromagnetic resonance ; magnetic bound polarons ; catalytic methane combustion|
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
|Data di pubblicazione:||2006|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.molcata.2005.11.056|
|Appare nelle tipologie:||01 - Articolo su periodico|