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isotherms, indicating again the presence of mesopores in Beta-1,-2,-3 zeolites. Moreover, the increase of adsorption capacities with pressure on four Beta zeolite samples follows, obviously, the order of Beta-0 < Beta-1 < Beta-2 < Beta-3, which can be reasonably ascribed to the increase of the mesopore volume (Vmeso) caused by newly created mesopores. 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 3 6 9 12 15 18 Pressure (mbar) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 3 6 9 12 15 18 Pressure (mbar) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 3 6 9 12 15 18 Pressure (mbar) p-xylene Beta-0 Beta-1 Beta-2 Beta-3 Fitting line m-xylene Beta-0 Beta-1 Beta-2 Beta-3 Fitting line FFigiguurere44..AAddssoorrpttiioniisothermsofxyleneisomerrssonBettazzeeoolliitteessaampplelsesatat303088KK.. 2.2.2. Modeling of Equilibrium Isotherms Table 2. Toth fitting parameters of xylene isomers on Beta-0. The single-site Toth model and the dual-site Toth model were used to fit the adsorption equilibrium o-xylene Beta-0 Beta-1 Beta-2 Beta-3 Fitting line T (K) qm (mmol·g−1) b (mbar−1·103) n R2 data for Beta-0 and Beta-1,-2,-3 zeolites, respectively. As illustrated in Figure 4, there is a good m-xylene agreement between the symbols of experimental data and the solid lines obtained from the fitting models. 308 2.74 4.93 0.25 0.9945 323 2.60 2.59 0.25 All the fitting parameters of three xylene isomers on the four Beta zeolites are summarized in Tables 2 and 3. The single-site Toth model can be expressed as follows [24]: 0.9815 0.9782 338 2.40 1.20 0.27 p-xylene q bp 308 2.79 q= m2.20 0.26 0.9781 0.9913 0.9828 (1) where q is the equilibrium adsorbed amount, qm is the representation of the saturation adsorption n 1/n 323 2.64 (1+(b1p.8)8) 0.26 338 2.44 0.99 0.27 o-xylene capacity, b-value reflects the interaction between adsorbate and adsorbent, n characterizes the surface 308 2.90 6.83 0.24 0.9894 heterogeneity3.2T3he farther n is f2ro.7m51, more heterogen2e.9o5us is the system0..2W5hen n is eq0u.9a8l8to01, the Toth 338 2.59 1.94 0.25 0.9888 model becomes the Langmuir model. Due to the change of adsorption environment for absorbate on mesoporous zeolites, the Toth isotherm model does not fit any more. In order to distinguish two categories of adsorption sites in the mesoporous Beta zeolite, the dual-site Toth model can be employed as follows: The single-site Toth model can be expressed as follows [24]: q= qmbp (1) 1 + (bp)n1/n where q is the equilibrium adsorbed amount, qm is the representation of the saturation adsorption capacity, b-value reflects the interaction between adsorbate and adsorbent, n characterizes the surface heterogeneity. The farther n is from 1, more heterogeneous is the system. When n is equal to 1, the Toth model becomes the Langmuir model. Due to the change of adsorption environment for absorbate on mesoporous zeolites, the Toth isotherm model does not fit any more. In order to distinguish two categories of adsorption sites in the mesoporous Beta zeolite, the dual-site Toth model can be employed as follows: q = qm1b1p + qm2b2p (2) 1 + (b1 p)n1 1/n1 1 + (b2 p)n2 1/n2 244 q (mmol/g) q (mmol/g) q (mmol/g)PDF Image | Zeolite Catalysis
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