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The selective catalytic reduction of N2O with CH4 on Na-MOR and Na-MFI exchanged with copper, cobalt or manganese

Paper ID Volume ID Publish Year Pages File Format Full-Text
46452 46440 2012 6 PDF Available
Title
The selective catalytic reduction of N2O with CH4 on Na-MOR and Na-MFI exchanged with copper, cobalt or manganese
Abstract

Cu-MOR, Cu-MFI, Co-MOR, Co-MFI and Mn-MFI were prepared by ion-exchange of Na-MOR or Na-MFI. On all samples, the catalytic activity for N2O decomposition, CH4 + N2O, CH4 + O2, and for the selective catalytic reduction (SCR) of N2O in the presence of O2 was studied in a flow apparatus with GC analysis of reactants and products.Extensively exchanged Cu-MOR and Cu-MFI were active for N2O decomposition. Cu-MOR and Cu-MFI exchanged at about 20% were much less active. All Co-MOR and Co-MFI catalysts, irrespective of the exchange-extent, were active for the same reaction. Mn-MFI was nearly inactive up to 773 K. All catalysts were active for CH4 + N2O. Cu-MOR and Cu-MFI were active for CH4 + O2, whereas Co-MOR, Co-MFI and Mn-MFI were much less active for this reaction. Irrespective of the exchange extent, Cu-MOR, Cu-MFI, Co-MOR, and Co-MFI were active for the SCR of N2O with CH4. Conversely, Mn-MFI was not active for this reaction. Turnover frequency was slightly higher for the various reactions on Me-MFI (Me = Cu or Co) than for the corresponding reactions on Me-MOR.We conclude that on Cu- and Co-zeolites, the SCR of N2O with CH4 consists of two nearly independent reactions: CH4 + N2O prevails at high temperature (673–773 K), and CH4 + O2 at lower temperature. The two reactions involve different catalytically active oxygen species: CH4 + O2 involves a molecular form, and CH4 + N2O a monoatomic form, arising from N2O. Because Co-MOR and Co-MFI are also active for the SCR of NOx, we suggest that these materials are promising catalysts for the simultaneous SCR of N2O and NOx with CH4.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Cu-, Co- and Mn-zeolites as catalysts for the SCR of N2O with CH4. ► Cu- and Co-zeolites are selective for the SCR of N2O with CH4. ► Mn-zeolites are not selective for the SCR of N2O with CH4. ► In the SCR of N2O with CH4 on Cu- and Co-zeolites, no CO formed.

Keywords
N2O SCR with CH4; Cu-MOR; Cu-MFI; Co-MOR; Co-MFI; Mn-MFI
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The selective catalytic reduction of N2O with CH4 on Na-MOR and Na-MFI exchanged with copper, cobalt or manganese
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 111–112, 12 January 2012, Pages 90–95
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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