Surface Analysis Using Neutral Radicals as Probe Molecules

Surface Analysis Using Neutral Radicals as Probe Molecules [Pg.180]

NO adsorption has been used also to study Ce02/Si02 catalysts [33]. On samples outgassed at 720 K two different adsorbed NO species appeared, with gz values of 1.9216 and 1.9528 (A( NO) = 31.9 G for both), and were ascribed to the presence of two types of cus Ce with different electron acceptor properties this correlated with the observation of two different Ce species in fluorescence spectra of reduced samples. The gz values observed in that study, higher than those measured on Ce02, were then attributed to the lower coordination of the Ce cations on the silica. [Pg.180]

Ce cations the latter measurements revealed also the presence of two types of cus [Pg.181]

in agreement with the results obtained with NO adsorption [33], [Pg.181]

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