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Performance of K-promoted hydrotalcite-derived CoMgAlO catalysts used for soot combustion, NOx storage and simultaneous soot–NOx removal

Paper ID Volume ID Publish Year Pages File Format Full-Text
47752 46481 2009 10 PDF Available
Title
Performance of K-promoted hydrotalcite-derived CoMgAlO catalysts used for soot combustion, NOx storage and simultaneous soot–NOx removal
Abstract

A series of K-promoted hydrotalcite-derived CoMgAlO catalysts were synthesized by coprecipitation. Their catalytic performance for soot combustion, NOx storage and simultaneous soot–NOx removal was evaluated, respectively. The techniques of TG/DTA, BET, XRD, EXAFS, XPS and in situ DRIFTS were employed for catalyst characterization. When K is added to the catalyst CoMgAlO, soot combustion is largely accelerated, with the temperature (Tm) for maximum soot conversion lowered by at least 50 °C. Moreover, the NOx reduction by soot over the catalysts calcined at 500–700 °C is also facilitated. The K-containing catalyst calcined at 600 °C shows not only the highest soot combustion rate, but also the maximum NOx reduction percentage of 32%, which is attributed to its high surface K/Co atomic ratio and the strong interaction between K and Co. In situ DRIFTS results reveal that NO is readily oxidized to NO2 and stored as nitrates over K-promoted catalysts, which could be reduced by soot more efficiently. Based on these investigations, a reaction pathway for soot combustion, NOx storage and simultaneous soot–NOx removal is proposed.

Keywords
Soot; NOx; Hydrotalcite-derived CoMgAlO catalysts; Potassium; Calcination temperature
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Performance of K-promoted hydrotalcite-derived CoMgAlO catalysts used for soot combustion, NOx storage and simultaneous soot–NOx removal
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 91, Issues 1–2, 7 September 2009, Pages 406–415
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