COMBUSTION EXHAUST GAS CATALYST CARRIER

摘要

PURPOSE:To improve the durability of a carrier by forming a combustion exhaust gas catalyst carrying part with a honeycomb catalyst-carrier and a stainless steel cylindrical container which stores the carrying part and has a specific value of thermal expansion coefficient. CONSTITUTION:A metallic combustion exhaust gas catalyst carrier is formed with a honeycomb catalyst-carrying part and a cylindrical container which stores the carrying part. In this case, the cylindrical container which stores the catalyst carrying part is constituted with a protective oxidized film consisting mainly of an Al oxide and stainless steel whose thermal expansion coefficient is almost the same as or less than the thermal expansion coefficient of a metal base material which constitutes the catalyst carrying part. The best suited cylindrical container is made of ferrite stainless steel containing at least 2pts.wt. or more of Al. The carrier thus obtained has improved durability and can be stably used for a long time.