| Summary: | Three polyimides and six inorganic fillers in a form of nanometer-sized particles were studied as thick film solution cast mixed matrix membranes (MMMs) for the transport of CO<sub>2</sub>, CH<sub>4</sub>, and H<sub>2</sub>O. Gas transport properties and electron microscopy images indicate good polymer-filler compatibility for all membranes. The only filler type thatdemonstrated good distribution throughout the membrane thickness at 10 wt.% loading was BaCe<sub>0.2</sub>Zr<sub>0.7</sub>Y<sub>0.1</sub>O<sub>3</sub> (BCZY). The influence of this filler on MMM gas transport properties was studied in detail for 6FDA-6FpDA in a filler content range from one to 20 wt.% and for Matrimid<sup>®</sup> and P84<sup>®</sup> at 10 wt.% loading. The most promising result was obtained for Matrimid<sup>®</sup>—10 wt.% BCZY MMM, which showed improvement in CO<sub>2</sub> and H<sub>2</sub>O permeabilities accompanied by increased CO<sub>2</sub>/CH<sub>4</sub> selectivity and high water selective membrane at elevated temperatures without H<sub>2</sub>O/permanent gas selectivity loss.
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