Abstract
The effect of SO 2 for the selective reduction of NO by C 3H 8 on Ag/Al 2O 3 was investigated in the presence of excess oxygen and water vapor. The NO x conversion decreased permanently even in the presence of a low concentration of SO 2 (0.5–10 ppm) at <773 K. The increase in SO 2 concentration resulted in a large decrease in NO x conversion at 773 K. However, when the reaction temperature was more than 823 K, the activity of Ag/Al 2O 3 remained constant even in the presence of 10 ppm of SO 2. The sulfate species formed on the used Ag/Al 2O 3 were characterized by a temperature programmed desorption method. The sulfated species formed on silver should mainly decrease the deNO x activity on the Ag/Al 2O 3. The sulfated Ag/Al 2O 3 was appreciably regenerated by thermal treatment in the deNO x feed at 873 K. The moderate activity remains at 773 K in the presence of 1 ppm SO 2 for long time by the heat treatment at every 20 h intervals.
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