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Abstract
Copper ion-exchanged ZSM-5 zeolite is the most active for the selective reduction of nitric oxide by ethene in the presence of oxygen at temperatures as low as 437–<Zn (873 K). The activity of copper ion-exchanged ZSM-5 zeolite did not decrease much even in a high gas hourly space velocity (GHSV) region of more than 10 000 h −1 while those of proton-exchanged zeolites and Al 2O 3 greatly decreased in such high GHSV regions.
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