Abstract
1. A test is proposed for the activity of copper-containing catalysts in the reaction of low-temperature conversion of carbon monoxide, based on the minimum temperature of dissociative adsorption of water. 2. The activation energies of water and carbon dioxide desorption have been calculated for three catalytic systems in the 30–220° interval. It is shown that the dissociatively adsorbed water is bound more strongly to the surface of the copper-zinc-alumina-calcium catalyst NTK-10, and molecularly adsorbed carbon dioxide is bound more strongly to the surface of the skeletal copper catalyst SK. The activation energy has been determined for the reaction of displacement of carbon dioxide by water on the NTK-10 catalyst at 200°. 3. It has been shown that carbon dioxide, competing with dissociatively adsorbed water, may lower the activity of the NTK-10. It is noted that such a phenomenon is absent on the skeletal copper catalyst. CO2 is desorbed from the surface of the skeletal catalyst much more slowly than from the surface of the NTK-10. 4. A possibility of error has been revealed in the determination of the character of surface inhomogeneity by thermal desorption, as a consequence of a change in the adsorption mechanism within the temperature interval of the determination.
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Schedule a callMore From: Bulletin of the Academy of Sciences of the USSR Division of Chemical Science
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