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 Defmicro = 10-13 to 10-15 cm2 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.
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