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Nature of the active sites in CO oxidation on FeSiBEA zeolites

Paper ID Volume ID Publish Year Pages File Format Full-Text
38894 45796 2016 11 PDF Available
Title
Nature of the active sites in CO oxidation on FeSiBEA zeolites
Abstract

•Nature of iron incorporated in FeSiBEA was identified by DR UV–vis and Mössbauer.•Two kinds of pseudo-tetrahedral Fe(III) sites were distinguished in FeSiBEA.•Distorted pseudo-tetrahedral Fe(II) sites exhibited high activity in CO oxidation.•Model of active iron centre for CO oxidation over FeSiBEA was proposed.

FeSiBEA zeolites containing 1 wt% of iron were prepared by a two-step postsynthesis method in acidic (pH = 2.6) (Fe1.0SiBEA(w)) and alkaline (pH = 10) (Fe1.0SiBEA(p)) conditions. The structure of the studied materials, their acidity as well as the nature and environment of iron present in the samples were studied by means of XRD, FTIR with CO as probe molecule, DR UV–vis, Mössbauer and XPS spectroscopies, respectively. Temperature-Programmed Surface Reaction (TPSR) was used to test the catalytic activity of FeSiBEA zeolites in CO oxidation in air in the temperature range of 298–773 K. It was shown that Fe1.0SiBEA(w) contains iron as framework pseudo-tetrahedral Fe(III), in contrast to Fe1.0SiBEA(p), in which additional octahedral FeOx oligomers were identified. Moreover, the presence of two kinds of pseudo-tetrahedral Fe(III) sites with different distortion was distinguished in Fe1.0SiBEA(w). The higher catalytic activity was showed by Fe1.0SiBEA(w) zeolite containing iron as a strongly distorted pseudo-tetrahedral Fe(III) well dispersed in the framework of SiBEA zeolite. The model of probable active iron centre in Fe1.0SiBEA(w) was presented.

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Keywords
Fe; Zeolite; CO; Oxidation; Mössbauer
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Nature of the active sites in CO oxidation on FeSiBEA zeolites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 519, 5 June 2016, Pages 16–26
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