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Selective reduction of NO with propylene in the presence of oxygen was carried out over Co ion-exchanged HY zeolites (Si/Al=2.55, 20) and Co-Pt combination catalysts based on HY zeolite (Si/Al=2.55). Between the two Co-HY catalysts, selective reduction of NO to N 2 was favored over Co-HY zeolite with lower Si/Al ratio, however, oxidation of NO and combustion of C 3 H 6 proceeded...
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