--Note--

Effect of Alkali Metal Cation on Catalytic Activity of TiO2-Supported Copper
Catalyst Derived from Copper (II) Chloride for Combustion
of Diesel Particulate

Yasunori IMADA†, Keisuke KITANO††, Hironobu OHKITA, Takanori MIZUSHIMA
and Noriyoshi KAKUTA*

Department of Materials Science, Toyohashi University of Technology; Tempaku, Toyohashi-shi
441-8580 Japan
† Present address: Department of Chemistry, Faculty of Engineering, Gifu University; Yanato,
Gifu-shi 501-1193 Japan
†† Present address: Daikin Industries, Ltd.; Nishi Hitotsuya, Settsu-shi 566-8585 Japan

Effect of alkali metal cation as an additive in catalytic combustion of Diesel particulate matter (PM) was investigated using TiO2-supported copper catalysts (M, Cu/TiO2, M: alkali metal ion) derived from copper (II) chloride (CuCl2, 2H2O) by the addition of Na+, K+, Rb+ and Cs+ ions, respectively. M, Cu/TiO2 catalysts except for Na, Cu/TiO2 showed good catalytic performance of the PM combustion below 620 K, especially in recycle use. This is attributed to that the presence of compounds consists of M-Cu-Cl promoted the intimate contact between MCl and Cu species after the decomposition of M-Cu-Cl. Since K, Cu/TiO2 among M, Cu/TiO2 catalysts was superior in combustion temperature, potassium is presumed to act favorably for the oxidation of PM.


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