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mixing throughout the ZLC system, the relationship between relative effluent concentration c/c0 and time t is given by references [41,46]: c ∞ exp-βn2Defft ∑ R2 c=2L 2 (5) 0 n=1 βn +L(L−1) where Deff/R2 is the effective diffusion time constant, R is the particle radius, L is a dimensionless parameter and the eigenvalues βn are given by the roots of the auxiliary equation: and where F is purge flow rate, Vs is the volume of adsorbent and K is the dimensionless Henry’s law constant. Based on the above relationships, Deff/R2 and L values can be extracted by fitting Equations (5)–(7) to the experimental ZLC data applying the full range method by matlab software [47]. Additionally, the relationship between the temperature and diffusivity is described by the Arrhenius form [48]: D = D0exp-Ea/RgT (8) From measurements at three different temperatures, estimates for the activation βncotβn + L − 1 = 0 (6) 1 FR2 L = 3 KV D (7) s eff energy Ea of diffusion may be calculated by 2 ∂lnDeff/R2 Ea = RgT ( where Rg is the ideal gas constant, the activation energy for diffusion Ea can be ) (9) calculated from the slope of line which is made according to ln Deff/R2 and 1/T [49]. ∂T The adsorption and diffusion properties of three xylene isomers on Beta zeolites with different mesoporosities were discussed to investigate the effects of mesopores in zeolites for molecules with different kinetic diameter, molecular configuration and dipole. The adsorption isotherms of three xylene isomers on mesoporous Beta zeolites presented the shapes of type IV, reflecting the introduction of secondary mesoporosity with together N2 adsorption. The enhanced adsorption capacities, reduced values of Henry’s constants KH and initial heats of adsorption Qst with increasing mesoporosity 4. Conclusions 253PDF Image | Zeolite Catalysis
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