ゾルゲル法によるアルミナファイバー型メタン燃焼触媒の調製

抄録

Porous alumina fibers were prepared by the sol-gel method, and palladium was supported on the fibers by dipping and mixing methods. In the latter palladium acetate was mixed with a sol before spinning. Better dispersion of palladium particles in the fiber was achieved by the mixing method than by the dipping method. The specific surface area of the fiber-catalyst prepared by the mixing method was one fiftieth smaller than those of the other catalysts. The activity of the fiber-type catalysts for methane combustion was evaluated and compared with that of a commercial granular-type alumina. The fiber-type catalysts showed higher activities than the granular one. Such a high activity of the fiber-type catalyst prepared by the mixing method, despite its small surface area, was attributed to its fibrous form and better dispersion of palladium particles. However, the activity of fiber-type catalysts drastically decreased by firing at 1200°C for 5h.