PURPOSE: To improve activity and heat resistance of catalyst by using catalyst supporting Pd on a carrier coated on a honeycomb base material in combination with catalyst supporting base metal oxide, etc. on the similar carrier and by changing the aperture of the base material.
CONSTITUTION: In the oxidation catalyst of this invention, the catalyst A is arranged to the front stage of the honeycomb, and ≥ one kind of the catalyst group B are arranged to the rear stage of the honeycomb, and the aperture of the front stage honeycomb is made larger than the aperture of the rear stage honeycomb. The catalyst A comprises Pd supported on a carrier such as alumina or zirconia coated on the surface of honeycomb-shaped heat resistant base material such as cordierite, mullite, etc. The catalyst group B is prepd. by supporting noble metals such as Pt, Pt-Rh, oxide of base metal such as Ni or Co, or compound oxide such as LaCoO3, etc. on a carrier similar to the above-described carrier.
YOKOYAMA SHIGEO
TSUNEYOSHI KIKUJI
SUWA MASATO
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