Chemistry, Physics and Technology of Surface, 2012, 3 (4), 429-438.

Investigation of Adsorption Dynamics of Volatile Compounds on Fine-Dispersed Adsorbents with a Pulsing Mode by Quartz Crystal Microbalance Method



A. P. Filippov, P. E. Strizhak, N. V. Vlasenko, Yu. N. Kochkin, T. G. Serebrii

Abstract


It is shown that the quartz crystal microbalance method can be utilized to study adsorption-desorption processes proceeding for several seconds and more. The pulse of sorbate vapor with half-width of a few seconds can be obtained by the injection of a dose of liqud sorbate at appropriate evaporator temperature and flow rate of carrier gas with the use of a device combined with the flow-through cell of the type of electronic nose. The use of piezoquartz resonator with a chemical coating based on a metal stearate, thiolate or cross-linked polymer is proposed as a simple, relatively quick-response sensor to control the current adsorbate concentration in gas phase. The method has been applied for determination of effective diffusion coefficients in the process of ethanol adsorption-desorption on fine dispersed macroporous sulfonic acid resin Amberlyst 15.

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