Abstract
Membranes of mixed ionic-electronic conductors have been widely studied for gas separation, electrosynthesis, and removal of pollutants. Not only the rates but also the selectivities of these processes are determined critically by the surface catalytic properties of the membranes, which in turn are determined by the morphology, microstructure, and composition of the surfaces. In this study, nanoporous Sr0.25Bi0.5FeO3-δ (SBF) layers, with or without the impregnation of catalysts, were applied to dense SBF membranes using a sol-gel process to investigate the effect of surface modification on the catalytic properties. It is found that both oxygen permeation rates and methane conversion of a dense SBF mixed-conducting membrane coated with a nanoporous SBF layer are much higher than those of an as-sintered SBF membrane without surface modification. Nanoparticles of nickel loaded into the porous SBF surface layer further enhanced methane conversion.
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