| 摘要 |
PROBLEM TO BE SOLVED: To provide a catalyst vessel which compatibly performs the rapid temperature rise of a catalyst carrier after starting the cooling, and degradation suppression of the catalyst carrier by the overheat in a heavy load condition. SOLUTION: The catalyst vessel 2 is disposed in an exhaust passage of an internal combustion engine to store a catalyst carrier 3 inside thereof, and comprises an expanded part 2a connected to the exhaust passage on the upstream side, a contracted part 2c connected to the exhaust passage on the downstream side, and a carrier storage part 2b which is located between the expanded part 2a and the contracted part 2c to store the catalyst carrier 3. At least the expanded part 2a has a multi-layered structure in which an air layer 6, a phase changing layer 8 formed of a phase changing material which is phase-changed between the liquidus and solidus, and a heat insulation layer 9 formed of a heat insulation material are disposed from the inner side toward the outer side. |
