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In situ investigation of Diesel soot combustion over an AgMnOx catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
46663 46444 2012 10 PDF Available
Title
In situ investigation of Diesel soot combustion over an AgMnOx catalyst
Abstract

An AgMnOx catalyst (3.5 wt.% Ag) incorporating silver ions in a Mn2O3 phase exhibits high performances for soot oxidation below 300 °C. Its structural and redox properties have been investigated under reaction conditions using in situ XRD and DTA-TGA measurements. The catalyst appears unmodified during soot combustion experiments under oxygen, but in the absence of oxygen the soot is stoichiometrically oxidised by lattice oxygen leading to catalyst bulk reduction according to the steps Mn2O3 → Mn3O4 → MnO.The isotopic reaction product composition (C16O2, C18O16O, C16O2, C16O and C18O) obtained during soot combustion experiments under 18O2 reveals that the reaction follows a redox mechanism, in which the transfer of lattice oxygen from the catalyst to the soot is responsible for the soot ignition at low temperature.

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► An AgMnOx oxide catalyst shows high activity for low temperature soot oxidation. ► Soot combustion under 18O2 forms preferentially C16O2 and C16O. ► The reaction follows a redox mechanism. ► Lattice oxygen transfer to the soot is responsible for ignition. ► Ag promotes Mn3+ reduction and Mn2+ oxidation.

Keywords
Diesel soot; Soot combustion; Mechanism; Ag–Mn mixed oxide; In-situ XRD; Oxygen isotopic exchange
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In situ investigation of Diesel soot combustion over an AgMnOx catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 119–120, 30 May 2012, Pages 287–296
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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Any Questions? feel free to contact us