The oxidation of nitric oxide and propylene was studied over a model alumina-supported platinum catalyst. Two treatments (22 h at 250 °C and 2 h at 800 °C) involving sulfur dioxide were performed in order to understand the effect of SO 2 aging. The role and stability of sulfur species stored during aging were investigated by the reduction of sulfated samples at 500 °C and temperature-programmed reduction (TPR) up to 800 °C. The low activity obtained after aging without reduction revealed the poisoning effect of surface sulfur species. The reduction at 500 °C released half of the surface species, which increased the catalytic activity for both NO and C 3 H 6 oxidation. The TPR removed the most stable sulfur species and improved the activity during cooling. The catalyst aged in SO 2 at high temperature showed the greatest activity for both reactions because of SO 2 exposure and low sulfur storage.
No takes yet. Share an insight, caveat, or question.
Auvray et al. (2013) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: