Microwave-assisted in-situ regeneration of a perovskite coated diesel soot filter

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• 作者：Zhang-Steenwinkel ; Y. ; van der Zande ; L.M. ; Castricum ; H.L. ; Bliek ; A. ; van den Brink ; R.W. ; et. al.
• 关键词：Carbon oxidation ; Perovskite ; Dielectric heating ; Thermal stability ; Soot filter
• 刊名：Chemical Engineering Science
• 出版年：2005
• 出版时间：February, 2005
• 年：2005
• 卷：60
• 期：3
• 页码：797-804
• 全文大小：408 K

文摘

Dielectric heating may be used as an in situ technique for the periodic regeneration of soot filters, as those used in Diesel engines. As generally the Diesel exhaust temperatures are below the soot light-off temperature, passive regeneration is not possible. Presently, we have investigated the dielectric heating of a monolithic soot filter, coated with a Formula Not Shown perovskite. This type of perovskite has suitable dielectric properties, i.e., a high dielectric loss factor, and simultaneously acts as an oxidation catalyst. It is shown that a perovskite coated cordierite filter, covered with synthetic carbon, can be fully regenerated with selectivity towards Formula Not Shown close to 100 % . In contrast, the same filter without such a coating can only be partially regenerated. Moreover, considerable amounts of CO are formed. The Formula Not Shown coating is shown to have excellent temperature shock resistance and thermo-chemical stability. It is shown that the microwave cavity design is crucial to obtain a uniform filter heating. Following the development of such a design, microwave assisted soot filter regeneration becomes feasible.