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where the meaning of qm, b, n is the same with that in above Toth model. The qm1, b1, and n1 characterize parameters of adsorption site I, which represent the adsorption sites located inside the micropores, while qm2, b2, n2 characterize parameters of adsorption site II which represent the adsorption sites located inside mesopores. Table 3. Dual-site Toth fitting parameters of xylene isomers on Beta-1,-2,-3. Sample Beta-1 Beta-2 Beta-3 Sorbate m-xylene p-xylene o-xylene m-xylene p-xylene o-xylene m-xylene p-xylene o-xylene T (K) 308 323 338 308 323 338 308 323 338 308 323 338 308 323 338 308 323 338 308 323 338 308 323 338 308 323 338 qm1 (mmol·g−1 ) 1.98 1.80 1.67 2.02 1.87 1.76 2.13 1.91 1.80 1.64 1.49 1.36 1.69 1.55 1.44 1.74 1.63 1.51 1.35 1.20 1.05 1.41 1.26 1.13 1.51 1.40 1.27 b1 n (mbar−1 ·103 ) 1 4.53 0.35 2.24 0.31 0.98 0.32 1.98 0.30 1.65 0.32 0.75 0.31 6.52 0.35 2.49 0.30 1.61 0.31 4.21 0.32 1.97 0.38 0.54 0.38 1.67 0.44 1.18 0.39 0.38 0.38 4.70 0.38 2.14 0.32 1.21 0.35 3.64 0.35 1.36 0.50 0.27 0.53 0.77 0.49 0.46 0.51 0.19 0.58 3.92 0.34 1.76 0.37 0.63 0.40 qm2 (mmol·g−1 ) 1.13 1.01 0.90 1.21 1.10 0.98 1.34 1.25 1.05 1.78 1.66 1.51 1.85 1.67 1.52 1.97 1.83 1.73 2.53 2.40 2.25 2.63 2.50 2.36 2.95 2.77 2.63 b2 n (mbar−1 ) 2 1.37 0.49 0.92 0.53 0.36 0.63 0.91 0.58 0.42 0.55 0.17 0.76 1.68 0.41 1.32 0.44 0.66 0.49 0.54 0.70 0.22 0.82 0.18 0.73 0.50 0.67 0.19 0.86 0.12 0.75 0.88 0.59 0.42 0.64 0.27 0.59 0.45 0.78 0.19 0.99 0.12 0.99 0.40 0.73 0.16 0.81 0.09 0.91 0.68 0.59 0.25 0.72 0.16 0.68 R2 0.9865 0.9960 0.9949 0.9948 0.9979 0.9976 0.9969 0.9982 0.9969 0.9979 0.9973 0.9964 0.9992 0.9981 0.9973 0.9951 0.9971 0.9974 0.9980 0.9983 0.9992 0.9985 0.9982 0.9984 0.9989 0.9992 0.9990 Table 2 shows that the saturation adsorption capacities qm of microporous sample Beta-0 at each temperature follow an order of m-xylene < p-xylene < o-xylene. The order of b-values is p-xylene < m-xylene < o-xylene. Besides, the values of n, which characterize the system heterogeneity, are comparable. For the mesoporous Beta-n zeolite samples, as listed in Table 3, qm1-values of three adsorbates decrease with the reduction of microporous volume in the order: Beta-1 > Beta-2 > Beta-3 while qm2-values have a growing trend with the increase of mesoporosity as expected. In addition, the total adsorption amounts of our samples at relative higher pressure are as follows: Beta-0 < Beta-1 < Beta-2 < Beta-3, revealing a fact that the presence of mesopores provides more space for adsorption and it is helpful for the increase of adsorption capacity. It is easy to be seen that the values of b1, b2 derived from the 245PDF Image | Zeolite Catalysis
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