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Precipitable silver compound catalysts for the selective catalytic reduction of NOx by ethanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
42480 45927 2010 7 PDF Available
Title
Precipitable silver compound catalysts for the selective catalytic reduction of NOx by ethanol
Abstract

The Ag/Al2O3, Ag3PO4/Al2O3, Ag2SO4/Al2O3 and AgCl/Al2O3 catalysts showed high activities for the selective catalytic reduction (SCR) of NOx by ethanol. AgCl was highly crystalloid on Al2O3, however, AgCl/Al2O3 gave the highest catalytic turnover frequency (TOF) for NOx reduction among the four catalysts. Calculated Mulliken charges of Ag compounds support the TOF results. The activity test and characterization results confirm that Ag+ is the active silver species for NOx reduction. The in situ FT-IR results of Ag3PO4/Al2O3, Ag2SO4/Al2O3 and AgCl/Al2O3 for NOx reduction further reveal a positive correlation between the high dispersion of Ag+ and the formation of active intermediates (the enolic and –NCO species), indicating a similar reaction pathway to that of the ethanol-SCR over Ag/Al2O3. Using the precipitable silver compounds greatly facilitates the preparation of monolith Ag/Al2O3 catalyst for practical usage. In fact, the high performance of the AgCl/Al2O3 honeycomb catalyst was confirmed by heavy duty diesel engine bench tests.

Graphical abstractUsing the precipitable silver compounds greatly facilitates the preparation of monolith Ag/Al2O3 catalyst. AgCl was highly crystalloid on Al2O3, however, AgCl/Al2O3 gave the highest catalytic TOF for NOx reduction among the four catalysts. Calculated Mulliken charges of Ag compounds support the TOF results. The activity test and characterization results confirm that Ag+ is the active silver species for NOx reduction.Figure optionsDownload full-size imageDownload high-quality image (140 K)Download as PowerPoint slide

Keywords
NOx; Selective catalytic reduction; Ag species; Silver compound catalysts; Precipitator
First Page Preview
Precipitable silver compound catalysts for the selective catalytic reduction of NOx by ethanol
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 375, Issue 2, 1 March 2010, Pages 258–264
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis