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Simultaneous removal of NOx and diesel soot over nanometer Ln-Na-Cu-O perovskite-like complex oxide catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
48523 46511 2008 12 PDF Available
Title
Simultaneous removal of NOx and diesel soot over nanometer Ln-Na-Cu-O perovskite-like complex oxide catalysts
Abstract

The nanometric Ln-Na-Cu-O (Ln = La, Pr, Nd, Sm, Gd) perovskite-like complex oxide catalysts were prepared by sol–gel auto-combustion method using citric acid as a ligand and an adjusting agent of particle-size and morphology. Their structures and physico-chemical properties were examined by chemical analysis, XRD, SEM, FT-IR, H2-TPR and MS-NO-TPD. The catalytic performances of these perovskite-like oxides for the simultaneous removal of soot and NOx were investigated by a technique of the temperature-programmed reaction (TPR). In the Ln-Na-Cu-O catalysts, the partial substitution of Na for La at A-site led to the formation of Cu3+ and/or oxygen vacancy, thus the catalytic activity was remarkably enhanced. The optimal substitution amount of Na (x) is equal to 0.3 for the reduction of NOx, and x is equal to 0.7 for soot combustion. Moreover, attributing to the effects of very small surface particle sizes of the catalysts and the strong oxidizing ability of NO2 which was produced from NO and O2 in the reactant gases on these catalysts, the nanometric Ln-Na-Cu-O perovskite-like oxides exhibit very high catalytic activities for soot combustion even under loose contact conditions between soot and the catalyst.

Keywords
Nanometer; Ln-Na-Cu-O perovskite-like complex oxides; Soot; NOx; Simultaneous removal
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Simultaneous removal of NOx and diesel soot over nanometer Ln-Na-Cu-O perovskite-like complex oxide catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 78, Issues 1–2, 17 January 2008, Pages 61–72
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