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Promotional effect of Nb additive on the activity and hydrothermal stability for the selective catalytic reduction of NOx with NH3 over CeZrOx catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
45298 46407 2016 9 PDF Available
Title
Promotional effect of Nb additive on the activity and hydrothermal stability for the selective catalytic reduction of NOx with NH3 over CeZrOx catalyst
Abstract

•The addition of Nb improved the N2 selectivity and NOx conversion over CeZr2Ox.•The CeNb3.0Zr2Ox catalyst showed excellent SO2/H2O tolerance.•The CeNb3.0Zr2Ox catalyst exhibited outstanding hydrothermal stability.

The promotional mechanism of Nb addition on the activity and hydrothermal stability of CeZr2Ox catalyst for the selective catalytic reduction of NOx with NH3 (NH3-SCR) was investigated by various methods including N2-physisorption, XRD, H2-TPR and in situ DRIFTS. The Nb-promoted CeZr2Ox catalyst showed remarkable NH3-SCR activity together with excellent N2 selectivity, SO2/H2O resistance and outstanding hydrothermal stability. The characterization results showed that the introduction of Nb to CeZr2Ox not only resulted in the high surface area and strong redox ability, but also promoted the adsorption and activation of NH3 and enhanced the reactivity of adsorbed nitrate together with NH3 species. All the above features were favorable for the superior NH3-SCR performance. In addition, the CeNb3.0Zr2Ox catalysts hydrothermally aged below 800 °C still possessed high redox ability and abundant acid sites, all of which were responsible for the excellent hydrothermal durability. The novel CeNb3.0Zr2Ox catalyst was a promising candidate for the removal of NOx from diesel engine.

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Keywords
Selective catalytic reduction; Nitrogen oxides; Diesel engine exhaust; Hydrothermal stability; CeNbZrOx mixed oxide
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Promotional effect of Nb additive on the activity and hydrothermal stability for the selective catalytic reduction of NOx with NH3 over CeZrOx catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 180, January 2016, Pages 766–774
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