Temperature-programmed desorption study of carbon monoxide adsorbed on magnesium oxide
- 1 January 1983
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 79 (6) , 1373-1380
- https://doi.org/10.1039/f19837901373
Abstract
The nature of the different types of CO adsorbed on MgO has been studied by the temperature-programmed desorption technique. Three desorption peaks for CO appeared in the temperature-programmed desorption profile at ca. 430 K (peak I), 470 K (peak II) and 560 K (peak III). The relative amounts of these three types of adsorbed CO varied with the pretreatment temperature of MgO and with the adsorption conditions. Peaks I, II and III reached a maximum when the MgO sample was pretreated at 873, 773 and 1273 K, respectively. The activation energies for the desorption of CO corresponding to peaks I and III were 25.5 and 42.2 kJ mol–1, respectively. Peak-I CO reacted more easily with O2 than peak-III CO. The former reacted at 273 K while some of the latter remained unreacted at 423 K. On the basis of 13CO tracer experiments it is suggested that the conversion of peak-I CO to peak-III CO is irreversible, and that the adsorption sites are common for both peak-I CO and peak-III CO.Keywords
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