Selective catalytic reduction of nitric oxide with ethylene on copper ion-exchanged Al-MCM-41 catalyst
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Chemical Engineering
Selective catalytic reduction (SCR) of NO{sub x} by ethylene was investigated on copper and/or cerium ion-exchanged Al-MCM-41 in the presence of excess oxygen. Ce-Al-MCM-41 showed little activity, but Cu-Al-MCM-41 and cerium-promoted Cu-Al-MCM-41 (i.e., Ce-Cu-Al-MCM-41) were found to be active in this reaction. Higher No{sub x} conversions to N{sub 2} were obtained on Ce-Cu-Al-MCM-41 as compared with Cu-Al-MCM-41. The maximum activity of Ce-Cu-Al-MCM-41 was close to that of Cu-ZSM-5, but the former had a wider temperature window. TPR results indicated that only isolated Cu{sup 2+} and Cu{sup +} ions were detected in the Cu{sup 2+}-exchanged Al-MCM-41 samples, which may play an important role in the selective catalytic reduction of No{sub x} to N{sub 2}. After some cerium ions were introduced into Cu-Al-MCM-41, Cu{sup 2+} in the molecular sieve became more easily reducible by H{sub 2}. This may be related to the increase of catalytic activity of NO{sub x} reduction by ethylene.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-96PC96206
- OSTI ID:
- 338591
- Journal Information:
- Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 3 Vol. 38; ISSN IECRED; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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