Carbon monoxide oxidation particle size effect

Akubuiro, E. C., Verykios, X. E. Lesnick, L. Dispersion and snpport effects in carbon monoxide oxidation over platinum. App/ied Catalysis 14, 215-227 (1985). Stara, L, Nehasil, V. MatoUn, V. The influence of particle size on CO oxidation on Pd/alumina model catalyst. Surface Science 331—333, 173—177 (1995). 

The strong inhibiting effect of water during the reduction of well-dispersed iron oxide phases on alumina surfaces is also apparent from the infrared spectrum of carbon monoxide adsorbed onto the reduced catalyst prepared from complex iron cyanides according to the above procedure of Boellaard and co-workers Despite the support, the size of the iron particles, and the loading of iron on the support all being essentially the same, the infrared spectrum of the adsorbed carbon monoxide is completely different. The absorption band at 2155 cm is not seen, which indicates that Fe(II) is not present at the alumina surface when reduced in the presence of low partial pressures of water vapor. Rather than bands with frequencies above about 2000 cm bands at 1806, 1884, and 1984 cm are observed (Fig. 5.9). Even at room temperature, disproportionation of carbon monoxide to carbon dioxide and carbon occurs, which is demonstrated by the presence of carbon dioxide adsorbed onto the alumina support. The infrared bands peaking at 1348 and 1598 cm arise from carbon dioxide adsorbed on alumina. 

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