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N. V. Zaletova, A. O. Turakulova, S. V. Kutzhev, V. V. Lunin
Factors influencing on the catalytic activity of
coprecipitated Ce0.5Zr0.5O2in soot oxidation
Abstract
Ce0.5Zr0.5O2 systems
subjected to different pretreatments are studied as catalysts in oxidation of
soot. The temperature of soot oxidation and efficiency of the catalyst depend
on its morphology, which affects the contact area between solid substrate and
catalyst. Redox cycles (TPR 1000°C, oxidation 500°C) are found to enhance oxygen mobility of the system
and thus decrease the temperature of soot oxidation. Oxidation of soot in the
air flow on the Ce0.5Zr0.5O2 catalyst leads to
its activation, reuse of the catalyst decreases the temperature of soot
combustion.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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