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A cyclic reaction pathway triggered by ammonia for the selective catalytic reduction of NOx by ethanol over Ag/Al2O3

Paper ID Volume ID Publish Year Pages File Format Full-Text
46316 46437 2013 9 PDF Available
Title
A cyclic reaction pathway triggered by ammonia for the selective catalytic reduction of NOx by ethanol over Ag/Al2O3
Abstract

Alumina-supported silver catalysts (Ag/Al2O3) prepared using nordstrandite as a precursor exhibited excellent activity for the selective catalytic reduction of NOx by ethanol (ethanol-SCR). During the ethanol-SCR, the formation of NH3 was observed over all Ag/Al2O3 catalysts, the amount of which was related to silver loading, reaction temperature, and the concentration of ethanol used, even when water was excluded from the inlet gas. Transient activity testing and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analysis showed that the reaction between isocyanate species (–NCO) and water is the main pathway of NH3 formation. Addition of NH3 enhanced the NOx conversion for ethanol-SCR and the oxidation of ethanol over 3 wt% Ag/Al2O3. DRIFTS analysis revealed for the first time that NH3 reacted with enolic species to form –NCO over Ag/Al2O3, thus resulting in a novel and cyclic reaction pathway for ethanol-SCR.

Graphical abstractAmmonia originating from the hydrolysis of –NCO species can in turn react with enolic species to produce –NCO, creating a cyclic pathway for the reduction of NOx by ethanol over Ag/Al2O3.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Ag/Al2O3 prepared from nordstrandite shows high activity for ethanol-SCR. ► Ammonia was inevitably produced by the hydrolysis of–NCO over Ag/Al2O3. ► In turn, the produced ammonia can react with enolic species to produce –NCO. ► This reaction involving ammonia creates a cyclic pathway for ethanol-SCR.

Keywords
Selective catalytic reduction of NOx; Ammonia; Enolic species; Ag/Al2O3; Isocyanate
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A cyclic reaction pathway triggered by ammonia for the selective catalytic reduction of NOx by ethanol over Ag/Al2O3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 136–137, 5 June 2013, Pages 103–111
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