ADSORPTION CHARACTERISTICS OF VOCS ON MESOPOROUS SORBENTS

摘要

Adsorption equilibria of VOCs on mesoporous sorbents (MCM-48) synthesized in our laboratory aremeasured at several temperatures using a quartz spring balance equipped in a high vaccum system. A new hybrid isotherm model for mesoporous sorbents is proposed by combining both the Langmuir isotherm at low pressure and the Sips isotherm in multilayer region. Since mesoporous sorbents have narrow pore size distribution between 20 to 46 A, capillary condensation of VOCs can be observed at P / P_0 =0.2?0.3. Also, the adsorbed amount decreased considerably with increasing pallatizing pressure. The isosteric heat of adsorption was calculated using experimental data.