Transport properties of modified Nafion membranes: Effect of zeolite and precursors |
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| Institution: | 1. Boreskov Institute of Catalysis, pr. akad. Lavrentieva 5, Novosibirsk, Russia;2. Dipartimento di Chimica IFM, Universita degli Studi di Torino, I10125, Torino, Italy;1. Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom;2. IFW Dresden, Institute for Metallic Materials, P.O. Box 270016, D-01171 Dresden, Germany;1. Université des Sciences et de la Technologie Houari Boumediene, Laboratoire des Matériaux Polymères, Faculté de Chimie, BP 32 El-Alia, Bab-Ezzouar, 16111 Algiers, Algeria;2. Univ. Nice Sophia Antipolis, CNRS, LPMC, UMR 7336, 06100 Nice, France;1. Department of Physics, Lal Bahadur Shastri Mahavidyalaya, Dharmabad, Dist. Nanded 431809, MS, India;2. Department of Electronics, Lal Bahadur Shastri Mahavidyalaya, Dharmabad, Dist. Nanded 431809, MS, India;3. School of Physical Sciences, S.R.T.M.University, Nanded 431606, MS, India;1. Kaliningrad State Technical University, Kaliningrad, Russia;2. Immanuel Kant Baltic Federal University, Kaliningrad, Russia |
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| Abstract: | Fe-silicalite/Nafion composite membranes with high relative selectivity (as defined by the proton conductivity to methanol permeability ratio) of 5.4 and proton conductivity of 11 mS cm? 1 were prepared by in situ hydrothermal synthesis of the zeolite within the pores of Nafion membranes. The effects of the zeolite structure and precursor structure were evaluated in terms of transport properties and acidity levels for a series of Nafion membranes modified with silica and tetrapropylammonium (TPA) and tetrabutylammonium (TBA) cations. Introduction of up to 40% (w/w) of silica vs. pure Nafion shows little effect on the transport and acidity properties of the composite membranes. Introduction of tetraalkylammonium (TAA) cations reduces water uptake of the membranes, and results in the appearance of protons that are inaccessible for titration in water media. The selectivity of the composite membranes increases in the order: SiO2/Nafion < TAA/Nafion < Fe-silicalite/Nafion. |
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