1234. GRAUE, G., AND RIEHL, N. [Size of the Pores and Inner Volumes of Amorphous and Crystalline Materials.] Ztschr. anorg. Chem., vol. 233, 1937, pp. 365-375; Chem. Abs., vol. 32, 1938, p. 18.

1234. GRAUE, G., AND RIEHL, N. [Size of the Pores and Inner Volumes of Amorphous and Crystalline Materials.] Ztschr. Anorg. Chem., vol. 233, 1937, pp. 365-375; Chem. Abs., vol. 32, 1938, p. 18.

Specific tests show that gases do not penetrate into catalysts through the large pores alone. Where there is random distribution or where the arrangement of the lattice lacks regularity, the irregular spacing of the atoms allows penetration, even through openings of atomic dimensions.