Journal
CATALYSIS COMMUNICATIONS
Volume 9, Issue 2, Pages 250-255Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2007.05.047
Keywords
catalysed soot oxidation; ceria; zirconia; Ce-Zr mixed oxides; diesel pollution control
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Ce-Zr mixed oxides calcined at 1000 degrees C are more active catalysts for soot oxidation than pure CeO2 calcined at the same temperature, both in loose and tight contact between soot and catalyst. 1000 degrees C sinterised-CeO2 presents a very low surface area (2 m(2)/g), a large crystal size (110 nm) and a lack of surface redox properties. Ce-Zr mixed oxides present higher BET surface areas (typically 17-19 m(2)/g), smaller crystal sizes and enhanced redox properties. The Zr molar fraction does not affect appreciably the catalytic activity of Ce-Zr mixed oxides in the range studied (Zr molar fraction from 0.11 to 0.5 1). (C) 2007 Elsevier B.V. All rights reserved.
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