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Preparation, characterization, catalytic activity and CO2 absorption/desorption studies of Ln/K (Ln = La, Sm, Y) catalysts for diesel soot elimination

Paper ID Volume ID Publish Year Pages File Format Full-Text
48639 46516 2007 13 PDF Available
Title
Preparation, characterization, catalytic activity and CO2 absorption/desorption studies of Ln/K (Ln = La, Sm, Y) catalysts for diesel soot elimination
Abstract

Ln/K oxide catalysts (Ln = La, Sm, Y) supported on the alumina substrate have been prepared and their catalytic activities of diesel soot oxidation were tested by TPR system. The results showed that all La/K, Sm/K and Y/K catalysts showed a similar change of catalytic activity with the variation of K content. Nevertheless, Y/K catalyst was more active for diesel soot oxidation with a soot ignition temperature of about 350 °C at a loose soot/catalyst contact mode. XRD, TG/DSC analyses were employed to investigate the structures and thermal behaviors of catalysts. It was found that the oxides would react with KNO3 to form the solid solution and the K+ saturation level was related to the ionic radii of the Ln3+. The Ln/K catalysts showed a physical CO2 absorption ability that was further enhanced at higher temperature. However, when the temperature was above a critical temperature, the absorption ability was reduced. The CO2 absorption characteristics was believed to be diffusion controlled and was attributable to the lattice defects (oxygen vacancies) caused by the solid solution formation. The dynamic CO2 transportation within the catalyst could play an important role on the catalytic oxidation process.

Keywords
Diesel soot; Oxidation; La2O3; Sm2O3; Y2O3; Catalytic activity; CO2 absorption and desorption
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Preparation, characterization, catalytic activity and CO2 absorption/desorption studies of Ln/K (Ln = La, Sm, Y) catalysts for diesel soot elimination
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 77, Issues 1–2, 30 November 2007, Pages 79–91
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