| 摘要 |
PURPOSE:To obtain the title catalyst with superior strength and no press. loss by alloying the surface layer of steel material of ring shape, etc. with Al and eluting the Al with a soln. which can dissolve Al to render the surface layer porous, followed by oxidation, dipping in a chloroplatinic acid soln. adjusted to be weakly alkaline with Ba(OH)2, and drying. CONSTITUTION:The surface layer of steel material of ring shape, honeycomb shape, etc. is alloyed with Al, and the Al is eluted with an aq. soln. of alkali metal hydroxide to render the surface layer porous. The porous layer is exidized by contact with gas contg. 0.1-20.8% O2, dipped in a chloroplatinic acid soln. adjusted to be weakly alkaline with Ba(OH)2, for 10 min-1 hr, and then dried at 100 deg.C or a slightly higher temp. The pH of the soln. is pref. about 9-10 and the concn. 0.01-1% as Pt. |
