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Investigations of surface VOx species and their contributions to activities of VOx/Ti0.5Sn0.5O2 catalysts toward selective catalytic reduction of NO by NH3

Paper ID Volume ID Publish Year Pages File Format Full-Text
40801 45866 2012 11 PDF Available
Title
Investigations of surface VOx species and their contributions to activities of VOx/Ti0.5Sn0.5O2 catalysts toward selective catalytic reduction of NO by NH3
Abstract

High surface area Ti0.5Sn0.5O2 mixed oxide with rutile phase was prepared by a coprecipitation method. The surface area of Ti0.5Sn0.5O2 sample is 76.7 m2 g−1, and VOx/Ti0.5Sn0.5O2 catalysts were prepared using the mixed oxide as support. Characterizations using XRD, FT-IR, LRS, EPR, UV–vis, and TEM demonstrated that vanadium oxide species are highly dispersed on the surface of Ti0.5Sn0.5O2 support when the loading amount of vanadium oxide is ≤1.5 mmol V/100 m2 Ti0.5Sn0.5O2. The dispersed vanadium oxide species form epitaxial-growth layer on the support. In situ FT-IR (NH3 adsorption), combined with NH3-TPD, indicate that the catalyst with vanadium loading amount of 1.5 mmol V/100 m2 Ti0.5Sn0.5O2, which equals to the dispersion capability, possesses a maximum amount of Brønsted acid sites. The 1.5V/Ti0.5Sn0.5O2 catalyst exhibits the best catalytic performance and good resistance to water vapor poison for the “NO + NH3 + O2” reaction, indicating that surface dispersed polymeric vanadium oxide species are the primary active species. A possible reaction mechanism is proposed on the basis of in situ FT-IR results.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (183 K)Download as PowerPoint slideHighlights► Vanadium oxide species are highly dispersed and form epitaxial-growth layer on TS support. ► The catalyst with the 1.5 mmol V/100 m2 possesses a maximum amount of Brønsted acid sites. ► Polymeric vanadium oxide species are the primary active species. ► 1.5V/TS catalyst exhibits the best catalytic performance for the “NO + NH3 + O2” reaction. ► A possible reaction mechanism is proposed on the basis of in situ FT-IR interrogation.

Keywords
Vanadium oxide; Ti0.5Sn0.5O2; Surface structure; Acidic sites; “NO + NH3 + O2” reaction
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Investigations of surface VOx species and their contributions to activities of VOx/Ti0.5Sn0.5O2 catalysts toward selective catalytic reduction of NO by NH3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 431–432, 26 July 2012, Pages 126–136
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
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