Abstract
A thin ZSM-5 film was grown on an α-alumina support, resulting in a composite membrane. The membranes were characterized by SEM and adsorption branch n-hexane/helium permporometry. In addition, the permeation of gas mixtures containing NO 2, NO, N 2 and argon was evaluated. The effect of temperature and gas mixture composition on the component permeation and selectivity was investigated. It was found that NO x permeation through the ZSM-5 membrane was partially surface concentration dependent and was thermally activated. However, transport by gas translational diffusion seemed to dominate at the conditions studied. The presence of various NO x adsorbed species appeared to influence diffusion of NO 2 in ZSM-5 and reduced transport of other inert and weakly adsorbed components over a wide temperature range (20–400 °C). Strongly adsorbed surface nitrate species formed in the presence of gas phase NO x should be responsible for the reduced transport of these components at the elevated temperature. The findings are of interest for possible applications of ZSM-5 membranes for component separation at high temperature.
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