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Novel V2O5–CeO2/TiO2 catalyst with low vanadium loading for the selective catalytic reduction of NOx by NH3

Paper ID Volume ID Publish Year Pages File Format Full-Text
45849 46426 2014 9 PDF Available
Title
Novel V2O5–CeO2/TiO2 catalyst with low vanadium loading for the selective catalytic reduction of NOx by NH3
Abstract

•V2O5–CeO2/TiO2 catalyst is much more active than V2O5/TiO2 for the NH3-SCR.•The addition of Ce enhances the alkali resistance of V2O5/TiO2 catalyst.•The formation of reactive NO2 and monodentate nitrate species can be promoted by Ce.•The redox cycle (V4+ + Ce4+ ↔ V5+ + Ce3+) plays a key role for the NH3-SCR of NOx.

The effect of Ce on the activity and alkali resistance of V2O5/TiO2 catalyst for the selective catalytic reduction (SCR) of NOx by NH3 has been investigated. It was found that the addition of Ce not only reduced the vanadium loading of V2O5/TiO2 but also enhanced its activity and alkali resistance. The NOx conversion over 0.5%V2O5-5%CeO2/TiO2 was much higher than that over 1%V2O5/TiO2 catalyst. Based on the catalyst characterization, the redox cycle (V4+ + Ce4+ ↔ V5+ + Ce3+) can account for the excellent NH3-SCR catalytic performance of 0.5%V2O5–5%CeO2/TiO2 catalyst. In situ diffuse reflectance infrared transform spectroscopy (DRIFTS) measurements revealed that the role of Ce on the V2O5–CeO2/TiO2 catalyst was to contribute to the formation of NO2 and monodentate nitrate species, both of which were reactive intermediates for the NH3-SCR of NOx.

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Keywords
Nitrogen oxides; Selective catalytic reduction; VCeTi; Redox cycle
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Novel V2O5–CeO2/TiO2 catalyst with low vanadium loading for the selective catalytic reduction of NOx by NH3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 158–159, October 2014, Pages 11–19
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