Self-diffusion coefficients of propane

Figure 4 Temperature dependence of the experimental self-diffusion coefficient of propane molecules in NaX.

Fig. 10. Self-diffusion coefficients of propane in zeolites NaX ( ), CaA (O), and ZSM-5 (A) at 300 K (5) as a function of sorbate concentration expressed by the number of C3H8 per 24 (Si -i- Al) atoms (representing one large cavity in the cases of zeolities X and A or one channel intersection with the adjacent pore segments in the case of ZSM-5). Data recently obtained in neutron scattering experiments for ZSM-5 (t) 74) are included.

Figure 9 Self-diffusion coefficients of propane (loading ca 2.5 molecules per channel intersection) in polycrystalline grains of fresh H ZSM-5 and after 1 h (corresponding to 3.6 mass X coke) and 12 h (corresponding to 4.3 mass % coke) on n-hsxane stream for different observation times h at 296 K (Reproduced with permission from Ref. 33. Copyright 1987 Elsevier)...

Using this procedure the self-diffusion coefficients of propane and butane were also determined in silicalite-1 and these coefficients are listed in Table 1. 

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