| abstract |
An exhaust gas purifying system, at least including, on an exhaust gas passage for gasnexhausted from an engine, a first HC-trap-catalyst (11) arranged on an upstream side, ansecond HC-trap-catalyst (12) arranged on a downstream side, and a heat capacitor (30) arrangednbetween the first HC-trap-catalyst (11) and the second HC-trap-catalyst (12). Each of the heatncapacitor (30) and the second HC-trap-catalyst (12) has a honeycomb carrier, and a ratio Gt/Gh 2 nof a geometric surface area Gt of the honeycomb carrier of the heat capacitor to angeometric surface area Gh 2 of the honeycomb carrier of the second HC-trap-catalyst (12) isnin a range of 1 to 5. |