| 摘要 |
A filter (10) for removing harmful substances contained in a discharge gas is constituted so as to have, upstream in a discharge gas passage, a first region where a harmful substance is removed by the effect of blocking inertial movement and further have, downstream therein, a second region where a harmful substance is removed by adsorption. A metallic catalyst (13) including a hydrocarbon adsorbent is deposited in the first region, and a metallic catalyst (14) including a material having the ability to occlude oxygen is deposited in the second region. Thus, a system for filtration and discharge-gas purification is provided which combines the collecting function of a filter with the oxidizing function of a catalyst and has a high collection efficiency, low-temperature activity, and low pressure loss.
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