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Characterisation and catalytic activity in de-NOx reactions of Fe-ZSM-5 zeolites prepared via ferric oxalate precursor

Paper ID Volume ID Publish Year Pages File Format Full-Text
47912 46485 2008 10 PDF Available
Title
Characterisation and catalytic activity in de-NOx reactions of Fe-ZSM-5 zeolites prepared via ferric oxalate precursor
Abstract

This paper deals with the spectroscopic characterisation and catalytic activity of Fe-ZSM-5 samples prepared by aqueous exchange with ferric oxalate and Mohr salt as precursors. NH4+-ZSM-5 zeolites with different Si/Al ratios were employed as starting materials, as such and after Na+-exchange. The catalytic activity of the samples was tested in the selective catalytic reduction of NO with propane in the 473–773 K range, and the nature of extraframework Fe species was investigated by UV–vis and FTIR spectroscopies, using NO as a probe molecule. The catalytic activity was found to be dependent upon the exchange method, the Si/Al ratio and the presence of Na+ ions. The results are discussed in terms of the relative concentration of isolated and clustered sites, as estimated by spectroscopic analysis. We propose that isolated sites are active in SCR, while clustered sites favour propane oxidation, having a detrimental effect on the activity for NO activation.

Keywords
Fe-ZSM-5; FTIR; UV–vis; Nitric oxide; Selective catalytic reduction
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Characterisation and catalytic activity in de-NOx reactions of Fe-ZSM-5 zeolites prepared via ferric oxalate precursor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 1–2, 25 October 2008, Pages 204–213
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
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