Adsorption—Desorption Dynamics of Alcohols on H-Beta and H-CMK Zeolites Nanocrystallites Studied by Quartz Crystal Microbalance Method

Abstract

The quartz crystal microbalance (QCM) method was used to study the adsorption–desorption dynamics of alcohols on the zeolite nanocrystallites (diameter, 200 nm). The mass transfer of C1–C4 alcohols on zeolites H-Beta and H-CMK nanocrystallites in the pulse and steady-flow modes at 100 °C and p/ps < 0.04 was studied with the QCM method. Experimental results show that the adsorption–desorption dynamics of various alcohols on the nanocrystallites is governed by diffusion in micropores, which is characterized by effective diffusion coefficients D ef micro = 10 −13 to 10 −15 cm 2 s −1 . Slow mass transfer of alcohols in the micropores of zeolites indicates natural limitations on the rate of the acid–base heterogeneously catalytic reactions over these solids.