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BEA zeolite modified with iron as effective catalyst for N2O decomposition and selective reduction of NO with ammonia

Paper ID Volume ID Publish Year Pages File Format Full-Text
46251 46435 2013 12 PDF Available
Title
BEA zeolite modified with iron as effective catalyst for N2O decomposition and selective reduction of NO with ammonia
Abstract

•Two-steps postsynthesis procedure allowed incorporating of iron in zeolite framework.•The isolated mononuclear Fe(III) was identified by DR UV–vis, XPS and XAS.•Mainly pseudo-tetrahedral Fe(III) was distinguished in FeSiBEA zeolite by Mössbauer.•FeSiBEA shows high activity (NO conversion > 90%) and selectivity to N2 (>95%).

BEA zeolite is modified by a two-steps postsynthesis method allowing incorporate iron atoms into the zeolite framework. Two series of the zeolite samples with aluminium (FexAlSiBEA) and without aluminium (FexSiBEA), containing various iron content (0.5–4.0 Fe wt.%) are obtained. For low Fe content (<2 Fe wt.%), iron is incorporated into the framework of SiBEA zeolite as a framework pseudo-tetrahedral Fe(III) as evidenced by combined used of XRD, DR UV–vis, XAS, 57Fe Mössbauer and XPS investigations. In contrast, for higher iron content, the framework pseudo-tetrahedral Fe(III) and an extra-framework octahedral Fe(III) species are identified. For FexAlSiBEA, significantly higher acidity than for FexSiBEA is evidenced by FTIR with adsorption of CO and TPD of NH3. FexAlSiBEA and FexSiBEA are found to be active and selective catalysts of N2O decomposition and selective catalytic reduction of NO with ammonia. The highest catalytic activity in both processes are obtained for the Fe4.0AlSiBEA sample containing iron mainly as the framework pseudo-tetrahedral Fe(III) and characterized by relatively high acidity.

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Keywords
Iron; BEA zeolite; Ammonia; N2O decomposition; SCR of NO
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BEA zeolite modified with iron as effective catalyst for N2O decomposition and selective reduction of NO with ammonia
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 138–139, 17 July 2013, Pages 434–445
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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Any Questions? feel free to contact us