| 摘要 |
PURPOSE:To prevent the release and detachment of a catalyst due to a temp. change repeating heating and cooling at high temp. or vibration by using a carrier material obtained by forming an alumina fibrous crystal to the surface of the three-dimensional skeleton of a three-dimensional reticulated metal porous body of an Ni-Cr-Al system. CONSTITUTION:A three-dimensional reticulated metal porous body used as a catalyst carrier material is obtained by oxidizing an Ni-Cr-Al system at high temp. to form a fibrous alumina crystal to the surface of a three- dimensional skeleton. The three-dimensional reticulated metal porous body of the Ni-Cr-Al system is obtained by diffusing and infiltrating Cr and Al in an Ni three-dimensional reticulated metal porous body to alloy them with Ni. The diffusion and infiltration treatment is selected so as to obtain a composition consisting of 20-40wt.% of Cr, 1-15wt.% of Al and 50wt.% or more of the remainder of Ni. In order to further enhance the heat resistance of the three-dimensional reticulated metal porous body of the Ni-Cr-Al system, yttrium or cerium being a rare earth element may be added in an amount of 0.01-0.1wt.%. |
