Abstract
Abstract The kinetics of CO adsorption on the perovskite-type oxide LaCrO3 at variable pressure (4.8 × 102 to 1.6 × 104 N m−2) and constant temperature (523°K), and variable temperature (273 to 724°K) and constant pressure (6.7 × 103 N m−2 has been studied. The adsorption isobar shows a sharp maximum at ∼500°K. The experimental data fit satisfactorily the integral Elovich's equation. The existence of a precursor state previous to the adsorption process itself has been shown by means of analysis of t vs Z(t) (reciprocal of the adsorption rate) curves. The ascending branch of the isobar (between room temperature and 500°K) corresponds to the activation of the CO molecule. From the Arrhenius plot of rm (maximum adsorption rate at zero time) vs. 1 T , an activation energy of 9.7 kJ mole−1 was calculated. From plots of rm vs P, a specific rate constant of 5.2 ± 0.3 × 10−4N−1 m2 was obtained.
Published Version
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