Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 627 - 634 (1987)
Update date:2022-08-25
Topics:
Kordulis, Christos
Vordonis, Leonidas
Lycourghiotis, Alexis
Pomonis, Phillipos
The kinetics of N2O decomposition on a series of specimens prepared by doping γ-Al2O3 with various amounts of Na+ ions has been studied at various temperatures using a flow-bed reactor working under atmospheric pressure.This doping promotes the adsorption of oxygen anions produced from surface decomposition, presumably via the formation of surface species a transformation of the rate equation from R=k into R=kbN2OPN2O/bO2P1/2O2 (where bN2O and bO2 are adsorption coefficients and PN2O and PO2 are partial pressures).Moreover, a decrease in catalytic activity, expressed either as fractional conversion or rate of reaction, was observed on increasing the surface coverage C, of γ-Al2O3 with Na+ ions determined by X-ray photoelectron spectroscopy.Specifically, the dependence of the catalytic activity on the surface coverage of γ-Al2O3 is described by the relationship 1n(1/R) = 15.4+(281/K)C (where K is a proportionality constant) and it was concluded that the deactivation observed is due to the promotion of the O2 adsorption caused by the Na+ ions.Finally, the linear dependence of the surface coverage of γ-Al2O3 on the sodium content strongly suggests that the dispersion of the sodium supported species is constant irrespective of the surface concentration of sodium.
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