Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
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Preparation and catalytic properties of low content Ag-added ZrO2 for soot oxidation
Sudarsan RAJMasatomo HATTORIMasakuni OZAWA
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2019 Volume 127 Issue 11 Pages 818-823


Low content (0.1–3.4 wt %) Ag added ZrO2 catalysts were synthesized by a hydrothermal method for soot combustion catalysis. The thermal stability and microstructure were characterized by X-ray diffractogram, field emission scanning microscopy, surface area and X-ray Absorption Fine Structure (XAFS) measurement. Soot oxidation temperature of Ag/ZrO2 catalysts was able to be controlled by changing heat-treatment temperature for starting powders. The mixture of metallic Ag and ionic Ag2O was observed by the XAFS spectra, and catalysts maintaining thermal stability were modified by active Ag/Ag2O mixed state on ZrO2. The catalysts with only 0.9 and 3.4 wt % doping of Ag in ZrO2 were effective and a better candidate for diesel soot oxidation catalysis.

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