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Novel promoting effect of acid modification on selective catalytic reduction of NO with ammonia over CeO2 catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
49541 46751 2015 5 PDF Available
Title
Novel promoting effect of acid modification on selective catalytic reduction of NO with ammonia over CeO2 catalyst
Abstract

•The NO conversion over CeO2 is obviously enhanced by the addition of solid acid.•The introduction of solid acid increases the acid strength of CeO2.•The addition of solid acid improves the distribution of Brønsted and Lewis acids.•The existence of Brønsted acid contributes to the excellent N2 selectivity.•The existence of weak and medium acids contributes to the superior SCR performance.

A series of acid modified CeO2 catalysts were prepared and used for selective catalytic reduction (SCR) of NO with NH3. The results showed that the SCR activity of pure CeO2 was greatly enhanced by the modification of acid. The CeO2 modified by 20% phosphotungstic acid exhibited the best NO conversion in a wide temperature range of 150–550 °C. The SCR activity was slightly influenced by SO2 and H2O, while such effect was reversible. The improvement of SCR activity and N2 selectivity over CeO2 catalyst modified by acid was attributed to the enhanced amount and intensity of Brønsted or Lewis acid sites.

Graphical abstractThe CeO2 catalysts modified by solid acid show high NO conversion for the NH3 selective catalytic reduction of NO at the space velocity of 60,000 h− 1. Furthermore, the catalyst modified by phosphotungstic acid exhibits the excellent N2 selectivity and the best activity in a wide temperature range of 150–525 °C. These were due to the enhanced amount and intensity of Brønsted or Lewis acid sites.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
CeO2; Acid sites; Modification; Brønsted
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Novel promoting effect of acid modification on selective catalytic reduction of NO with ammonia over CeO2 catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 59, 10 January 2015, Pages 170–174
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