Abstract
The catalytic activity for CO oxidation has been studied for samples of the solid-solution series LaCo 1− t Cr t O 3, and NdCoO 3 for comparison. The catalytic activity over LaCo 1− t Cr t O 3 generally decreases with increasing chromium content. For samples with t = 0.70 and 0.80, distinct activity changes occur during the reaction, for t = 0.80 representing a permanent deactivation. Samples of LaCo 1− t Cr t O 3 were also studied by XRD, TPR, TG and XPS. Variations in catalytic activity were compared with variations in structural, physical and chemical properties. A rough correlation was found between the starting temperature for reduction during TPR and the temperature required for 5% CO conversion. Furthermore, the activity pattern at 600 K follows the atom percentage of surface oxygen species as seen by XPS. Possible surface reactions on LaCo 1− t Cr t O 3 during the catalytic oxidation of CO are discussed.
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