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High catalytic activity of SCS-synthesized ceria towards diesel soot combustion

Paper ID Volume ID Publish Year Pages File Format Full-Text
48744 46520 2006 8 PDF Available
Title
High catalytic activity of SCS-synthesized ceria towards diesel soot combustion
Abstract

Nano-sized particles of ceria with high surface area were processed by solution combustion synthesis (SCS) and their catalytic activity towards combustion of carbonaceous materials was compared with that obtained by simple thermal decomposition of cerium nitrate, exhibiting the same specific surface area. These two kinds of ceria powders were tested by DTA and temperature-programmed combustion of diesel soot and a commercial carbon.Ceria processed by SCS was found to be more active than its counter part since it could decrease significantly both the combustion activation energy (from 115 to 111 kcal/mol) and the TPC-plot peak temperature of diesel soot (from 466 to 405 °C).The mechanism of the catalytic reaction of combustion was investigated by TPD/R experiments. Likewise other combustion catalysts acting as oxygen pumps, ceria can exchange limited amounts of oxygen even below 300 °C, the SCS-synthesized one showing a superior O2 release at low temperatures (≤450 °C). Moreover, the SCS-ceria exhibited a microstructure (i.e. a foam of nano-sized crystals) particularly suitable for maximizing the number of contact points between catalyst and carbon. Finally, the effect of specific aging protocols (thermal treatment at 600 °C for 96 h) in the presence of potentially deactivating species present in diesel exhaust gases (SO2 and water) was also studied showing that the here proposed material suffers from less significant ageing than Ce(NO3)3-derived ceria.

Keywords
Ceria; Solution combustion synthesis; Catalytic combustion; Soot; Diesel engine
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High catalytic activity of SCS-synthesized ceria towards diesel soot combustion
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 69, Issues 1–2, 1 December 2006, Pages 85–92
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