Diffusion in sodium mordenite

The rates of diffusion of CH4, nC4H10, iso‐C4H10, and C4F10 into well‐characterized single crystals of sodium mordenite were studied at 25°C to 100°C., using a rapidly responding constant‐volume system. The diffusion coefficients are of the order of 10−8 to 10−9 sq. cm/sec. and exhibit a maximum value with time, probably due to an initial temperature increase caused by the heat of sorption. The implications to catalysis of these and other studies of diffusion in zeolites are discussed.