シリカアルミナ媒体の細孔構造, 拡散係数に関する拡散促進剤の効果

概要

論文の詳細を見る
A method is described for preparing silica-alumina catalyst pellets having a controlled and enlarged pore volume and an improved effective diffusion coefficient by the addition of a powder diffusion promoter. Sieved silica-alumina xerogel powder as the promoter was mixed into the same mother hydrogel, and calcined at 500℃ for 2 to 3 hrs. The pore structure and effective diffusion coefficient of the sample pellet were measured by a mercury porosimeter, N_2-adsorption, scanning electron microscope and diffusion cell. The results obtained were as follows: (1) Addition of the promoter caused increase of macropores. (2) Formation of macropores was due to the difference in drying shrinkage between the hydrogel and the xerogel promoter. (3) Effective diffusion coefficient was remarkably improved by the formation of macropores.
社団法人日本材料学会の論文
1976-07-15