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Mn–Fe/ZSM5 as a low-temperature SCR catalyst to remove NOx from diesel engine exhaust

Paper ID Volume ID Publish Year Pages File Format Full-Text
46524 46441 2012 13 PDF Available
Title
Mn–Fe/ZSM5 as a low-temperature SCR catalyst to remove NOx from diesel engine exhaust
Abstract

A Mn–Fe/ZSM5 catalyst has been developed for removing NOx from diesel engine exhausts and its excellent low-temperature SCR activity and N2 selectivity demonstrated in comparison with other representative SCR catalysts including CuZSM5 and a Cu-based commercial catalyst (COM). The well-dispersed MnO2 and the high NH3 adsorption capacity of the Mn–Fe/ZSM5 catalyst have been identified as the primary sources for its high deNOx activity for NH3/SCR. Hydrothermal stability and durability of the Mn–Fe/ZSM5 catalyst have been examined and compared to those of the CuZSM5 and COM catalysts. The hydrothermal stability of the catalyst improved upon the increase of Mn content and/or the addition of Er, the latter of which helps to stabilize the dispersion of MnOx on the catalyst surface during hydrothermal aging. The deNOx activity of the Mn–Fe/ZSM5 and its Er-promoted counterpart was less affected by HC poisoning, C3H6 poisoning in particular, compared to the CuZSM5 and COM catalysts, mainly due to the excellent C3H6 oxidation activity of MnO2. No poisoning of the Mn-based ZSM5 and CuZSM5 catalysts has been observed upon the addition of 2 wt.% of K+ and Ca2+ to their surface, primarily due to the high NH3 adsorption capacity of the ZSM5 support, whereas the COM catalyst has been severely deactivated by the deposition of K+ and Ca2+. The deNOx activity of the Mn-based ZSM5 catalyst, particularly the Er-promoted one, was less affected by SO2 compared to the CuZSM5 and COM catalysts, although it was hardly regenerated at 500 °C. Formation of MnSO4 on the catalytic surface appears to be the primary cause for the deactivation of the Mn-based ZSM5 catalysts in the presence of SO2 in the feed gas stream.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ Mn–Fe/ZSM5 exhibits excellent low-temperature deNOx activity and N2 selectivity. ▸ Its hydrothermal stability is enhanced by addition of Mn and Er. ▸ Mn–Fe/ZSM5 has excellent durability toward K+, Ca2+ as well as C3H6. ▸ Mn–Fe/ZSM5 is deactivated by SO2 due to the formation of MnSO4.

Keywords
Selective catalytic reduction; Manganese; Hydrothermal aging; Sulfur poisoning; HC inhibition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 126, 25 September 2012, Pages 9–21
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
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us