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Steam resistant CoLa-mordenite catalysts for the SCR of NOx with CH4

Paper ID Volume ID Publish Year Pages File Format Full-Text
42958 45949 2009 13 PDF Available
Title
Steam resistant CoLa-mordenite catalysts for the SCR of NOx with CH4
Abstract

The stabilization of Co-mordenite catalysts through lanthanum exchange is reported here. The effect of exchange order and calcination conditions upon the reduction of NOx to N2 at 500 °C was tracked during 400 h on a stream containing NOx, CH4, O2 and 10% H2O. Both the fresh and used catalysts were characterized through TPR, Raman spectroscopy, FTIR spectroscopy using CO as probe molecule, and XPS. These techniques revealed that the CoLa-mordenite catalysts which were not affected by the severe hydrothermal treatment showed no sign of Co or La migration out of the exchange positions. Instead, those that rapidly deactivated showed the formation of cobalt oxides and, in some cases, the migration of the cations to other exchange positions. The presence of exchanged lanthanum seems to preserve the integrity of the zeolite structure preventing the migration of cobalt ions with the subsequent formation of cobalt oxides which favors the reaction of methane with O2, thus decreasing N2 production.

Graphical abstractThe stabilization of Co-mordenite catalysts through lanthanum exchange was studied for the SCR of NOx with CH4. A battery of characterization techniques allowed us to suggest that the presence of exchanged lanthanum seems to preserve the integrity of the zeolite structure preventing the migration of cobalt ions with the subsequent formation of cobalt oxides.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Mordenite stability; Co-mordenite deactivation; Zeolite hydrothermal stability; NOx elimination
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Steam resistant CoLa-mordenite catalysts for the SCR of NOx with CH4
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 360, Issue 2, 1 June 2009, Pages 107–119
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