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An XAFS study on the specific microstructure of active species in iron titanate catalyst for NH3-SCR of NOx

Paper ID Volume ID Publish Year Pages File Format Full-Text
55108 47040 2013 8 PDF Available
Title
An XAFS study on the specific microstructure of active species in iron titanate catalyst for NH3-SCR of NOx
Abstract

Environmental-friendly iron titanate (FeTiOx) catalyst is a potential candidate for the substitution of conventional V2O5WO3 (MoO3)/TiO2 catalyst for the selective catalytic reduction of NOx with NH3 (NH3-SCR) for the NOx elimination from stationary and mobile sources for environmental protection. To understand in-depth the nature of active structure in this FeTiOx catalyst for further catalyst redesign and activity improvement, the study of X-ray absorption near-edge spectroscopy (XANES) and extended X-ray absorption fine-structure spectroscopy (EXAFS) combined with theoretical calculation is carefully performed. Different from the crystal structure of hematite Fe2O3, homogeneous edge shared Fe3+(O)2Ti4+ structure in FeTiOx catalyst prepared from Ti(SO4)2 precursor is obviously formed with crystallite phase, which shows the electronic inductive effect between Fe3+ and Ti4+ species, resulting in the high NO adsorption and oxidation ability of Fe3+ species and thus high catalytic activity and N2 selectivity in the NH3-SCR reaction. In the future study, this specific edge shared Fe3+(O)2Ti4+ structure can be stabilized onto certain catalyst supports with large surface area for practical use, such as the catalytic removal of NOx from flue gas and diesel engine exhaust.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (174 K)Download as PowerPoint slideHighlights► Environmentally benign iron titanate catalyst FeTiOx for NH3-SCR of NOx. ► Specific microstructure of FeTiOx determined by XANES and EXAFS methods. ► Homogeneous Fe3+(O)2Ti4+ structure with edge shared linkage in crystallite phase. ► Electronic inductive effect between Fe3+ and Ti4+ species leading to higher oxidation ability of Fe3+. ► A promising catalyst for NOx removal from coal-fired power plants or diesel engine exhaust.

Keywords
Iron titanate catalyst; Selective catalytic reduction; Environmental-friendly; XANES; EXAFS; Electronic inductive effect
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An XAFS study on the specific microstructure of active species in iron titanate catalyst for NH3-SCR of NOx
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 201, 1 March 2013, Pages 131–138
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