Abstract
One weight percentage PdO/SnO 2 and 0.1 wt.% Na–1 wt.% PdO/SnO 2 catalysts have been synthesized through a sol–gel route and these catalysts have been characterized by XRD, BET, SEM and temperature-programmed adsorption and desorption techniques with regard to their activity for the CO oxidation reaction. CO adsorption and CO–O 2 co-adsorption followed by O 2 TPD have been carried out to observe the role of sodium promotion on the catalytic activity. The catalytic activity of PdO/SnO 2 catalysts is suppressed by blockage of CO active sites by O 2 on co-adsorbed catalysts. Sodium-promoted catalysts possess increased affinity to oxygen and thus, exhibit superior activity upon CO–O 2 co-adsorption, but these catalysts have been observed to perform poorly upon consecutive adsorption of CO and O 2. The effect has been ascribed to enhanced interaction of sodium-promoted surfaces with CO hindering oxygen adsorption on CO precovered surface.
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