C. Oliva et al., Characterisation by EPR and other techniques of La1-xCexCoO3+delta perovskite-like catalysts for methane flameless combustion, APP CATAL A, 205(1-2), 2001, pp. 245-252
Two differently prepared series of La1-xCexCoO3 (x=0, 0.05, 0.1, 0.2), indi
cated by A and C, have been analysed by EPR at temperature ranging between
95 and 295 K, both before and after their use as catalysts for methane flam
eless combustion. At progressively lowering temperature, some samples showe
d a narrowing Lorentzian-shaped pattern. This has been attributed to the fo
rmation of ordered layer-like systems. A different behaviour has been notic
ed with the x=0.1 samples of both series. The formation of spin bags and of
spin glass has been hypothesised with these samples. A correlation between
EPR spectra and catalytic performance has been highlighted. (C) 2001 Elsev
ier Science B.V. All rights reserved.