To provide a hydrocarbon (HC) trapping catalyst which enables an improvement in the HC purifying efficiency by increasing the thickness of the adsorption layer partially to retard the HC-detaching timing partially in order to carry out discharge of HCs uniformly in a specified period.
The HC trapping catalyst keeps a carrier 1 having a polygonal cross-section of the cell overlaid with an adsorption layer 2 carrying an adsorbent which has a hydrocarbon adsorbing function and a catalyst layer 3 carrying a catalyst which is arranged in the upper layer of the adsorption layer 2 and has the function of purifying harmful ingredients in exhaust gas. The adsorption layer 2 has the maximum thickness, a+c, on the segment lines drawn between corners 1a, 1b, 1c and 1d and the center of gravity, G1, of the cross-section of the cell.
COPYRIGHT: (C)2007,JPO&INPIT
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Tadahiro Mitsuishi
Yasuyuki Tanaka
Hiroshi Matsumoto