Abstract
CATALYTIC oxidation of CO, both by O2 and by nitrogen oxides (NOx), is of considerable relevance to the removal of toxic CO and/or NOx from exhaust gases. Certain applications such as automobile exhaust control in cold-start conditions, and the removal of CO from tobacco smoke by use of a catalytic filter, demand not only catalytic activity at moderately low temperatures, but also effectiveness in the presence of water vapour. The low-temperature activities of most catalysts are at best (for example precious metals) partially destroyed, or at worst (for example base metal oxides) totally destroyed by poisoning due to water vapour. The results presented here demonstrate that, not only is the low-temperature activity of the Pd–SnO2 system not poisoned by water vapour, but rather its presence causes a marked enhancement in activity for the oxidation of CO both by O2 and by NO.
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