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Sulfur poisoning and regeneration of the Ag/γ-Al2O3 catalyst for H2-assisted SCR of NOx by ammonia

Paper ID Volume ID Publish Year Pages File Format Full-Text
46354 46438 2012 10 PDF Available
Title
Sulfur poisoning and regeneration of the Ag/γ-Al2O3 catalyst for H2-assisted SCR of NOx by ammonia
Abstract

Sulfur poisoning and regeneration mechanisms for a 2% Ag/γ-Al2O3 catalyst for the H2-assisted selective catalytic reduction of NOx by NH3 are investigated. The catalyst has medium sulfur tolerance at low temperatures, however a good capability of regeneration at 670 °C under lean conditions when H2 is present. These heating conditions can easily be established during soot filter regeneration. Furthermore, two types of active sites could be identified with different regeneration capabilities, namely finely dispersed Ag and larger Ag nanoparticles. The most active sites are associated with the finely dispersed Ag. These sites are irreversibly poisoned and cannot be regenerated under driving conditions. On the other hand the larger Ag nanoparticles are reversibly poisoned by direct SOx adsorption. The interpretation of the data is supported by DFT calculations.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► SO2 tolerance testing protocol is developed for NOx SCR catalysts. ► Catalyst lifecycle in automotive application is modeled in the test setup. ► Ag/Al2O3 can be regenerated from sulfur under DPF regeneration conditions. ► Al2O3 contain two types of active sites with different regeneration capabilities.

Keywords
Ag/Al2O3; SO2; NOx SCR; Poisoning; Regeneration
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Sulfur poisoning and regeneration of the Ag/γ-Al2O3 catalyst for H2-assisted SCR of NOx by ammonia
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 117–118, 18 May 2012, Pages 49–58
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