title: Adsorption behavior of toluene on modified 1X molecular sieves.
abstract: In this paper, the toluene adsorption/desorption properties of modified 13X molecular sieves (M-13X) are discussed. M-13X molecular sieves were prepared by acidic and steam treatments of 13X molecular sieves. The structural parameters of M-13X were evaluated and compared with those of other molecular sieves (HY, HZSM-5, Cs7NaMOR, and a commercial 13X). The results show that the specific surface area, average pore diameter and pore volume of M-13X were 414.17 m2/g, 2.98 nm, and 0.31 mL/g, respectively. The pore size distribution of M-13X was 1.8-3.0 nm. Because of its larger Si/Al ratio (Si/Al = 6.77), the hydrophobicity of M-13X is much higher than that of 13X (Si/Al = 1.28), indicating that it is particularly well suited to toluene control applications. The saturation adsorption capacity of M-13X was 0.045 g/g for simulated toluene at a temperature of 293 K and a relative humidity of 50%. The optimal regeneration temperature of M-13X was 473 K for 120 min with a hot air flow rate of 140 L/min.
  
  
  CONCLUSIONS
  The modified 13X molecular sieves (M-13X) are adsorbents with a high adsorption capacity and great hydrophobicity, suitable for the treatment of VOCs. The purpose of the present investigation is to provide a practical guide for their design.
authors.affiliation: College of Biological and Environmental Engineering, Zhejiang University of Technology, No. 18 Chaowang Road, Hangzhou 310032, PR China.
authors.forename: Yunfeng
authors.initials: Y
authors.lastname: Yu
authors.forename: Liangwei
authors.initials: L
authors.lastname: Zheng
authors.forename: Jiade
authors.initials: J
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D002853:Chromatography, Liquid / Q000379:methods*; D006813:Humidity; D013499:Surface Properties; D013696:Temperature; D014050:Toluene / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D014050:Toluene