Fabrication of perovskite capillary membranes for high temperature gas separation

authors	Van Noyen, J; Middelkoop, V; Buysse, C; Kovalevsky, A; Snijkers, F; Buekenhoudt, A; Mullens, S; Luyten, J; Kretzschmar, J; Lenaerts, S
nationality	International
journal	CATALYSIS TODAY
author keywords	Mixed conducting perovskite; Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF); Capillary Oxygen separation; Phase-inversion; Macrovoid-free
keywords	HOLLOW-FIBER MEMBRANES; PRASEODYMIUM OXIDE CATALYSTS; OXYGEN-TRANSPORT MEMBRANES; UNSTABLE LATTICE OXYGEN; DENSE CERAMIC MEMBRANES; BA0.5SR0.5CO0.8FE0.2O3-DELTA; PERMEATION; STABILITY; METHANE; ION
abstract	Oxygen-permeable perovskites with mixed ionic-electronic conducting properties can play an important role in carbon capture and storage techniques. Their ability to separate oxygen from air is needed, more specifically, in oxy-fuel and pre-combustion technologies. In this work, the first detailed comparative analysis and new results are reported on four types of Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) capillary membranes: non-coated sulphur-containing; catalyst-coated sulphur-containing; non-coated sulphur-free and catalyst-coated sulphur-free. The fabrication of BSCF capillaries by a spinning technique based on phase inversion is further discussed and their oxygen separation performances are interpreted. The comparison of the performance of these different generations of BSCF capillaries of similar dimensions demonstrates a significant impact of the sulphur contamination on both the oxygen flux through the membrane and the activation energy of the overall oxygen transport mechanism. Careful attention is paid to the effect of activation layers on both sulphur-free and sulphur-containing types of capillaries. Additional long-term testing of the sulphur-free BSCF capillaries is presented, where partial decomposition of the membrane surface was observed due to kinetic demixing. (c) 2012 Elsevier B.V. All rights reserved.
publisher	ELSEVIER SCIENCE BV
issn	0920-5861
year published	2012
volume	193
issue	1
beginning page	172
ending page	178
digital object identifier (doi)	10.1016/j.cattod.2012.03.005
web of science category	Chemistry, Applied; Chemistry, Physical; Engineering, Chemical
subject category	Chemistry; Engineering
unique article identifier	WOS:000308675900025