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Iron-exchanged FAU zeolites: Preparation, characterization and catalytic properties for N2O decomposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
43109 45955 2008 11 PDF Available
Title
Iron-exchanged FAU zeolites: Preparation, characterization and catalytic properties for N2O decomposition
Abstract

New Fe-FAU zeolitic catalysts made from large channel zeolite matrix FAU by a simple wet ion exchange method show an excellent performance in N2O catalytic decomposition. The ion exchange process was discussed in detail and the optimal conditions for wet ion exchange were proposed. The formation of various iron sites in Fe-FAU samples (isolated Fe ions, oligonuclear clusters and Fe2O3 nanoparticles) during preparation process was extensively investigated by means of UV–vis spectra, FTIR spectra of NO adsorption, TEM images, H2-TPR and 27Al MAS-NMR spectra. We have found that Fe(III)-FAU catalysts more effectively decompose N2O with/out NO-assistance than other Fe-zeolite (such as Fe-MFI) catalysts prepared in the same way. Comprehensive understanding of the structure properties and the catalytic performance suggests that different iron sites in Fe-FAU make different contributions to N2O thermal decomposition and that isolated/oligonuclear iron species contribute more due to their high accessibility towards N2O. In addition, the high durability of Fe-FAU catalysts is proposed to account for the particular interactions between iron species and zeolite framework.

Graphical abstractLarge-channel zeolite FAU can be readily loaded with ferric ions in a high dispersion state by simple wet ion exchange. Such an Fe(III)-zeolite catalyst shows a higher activity and a longer durability for N2O thermal decomposition than Fe-MFI zeolite catalysts, presumably because of the attachment of various Fe(III) species onto the zeolite framework.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Fe-zeolite catalysts; N2O decomposition; FAU; Wet ion exchange
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Iron-exchanged FAU zeolites: Preparation, characterization and catalytic properties for N2O decomposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 344, Issues 1–2, 15 July 2008, Pages 131–141
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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