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Abstract
The catalytic activity of copper ion-exchanged ZSM-5 zeolites, used for the selective reduction of nitric oxide by propene in the presence of oxygen was only slightly decreased by the addition of sulfur dioxide; for example, the conversion of nitric oxide into nitrogen was changed from ca. 100% in the absence of sulfur dioxide to 85% (773 K) upon the introduction of sulfur dioxide. In contrast, the catalytic activity for nitric oxide decomposition completely disappeared upon addition of sulfur dioxide. These results show that the selective reduction of nitric oxide by hydrocarbon may be practical.
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