Performance of tubular SrFe(Al)O(3-delta)-SrAl(2)O(4) composite membranes in CO(2)- and CH(4)-containing atmospheres
authors Yaremchenko, AA; Kharton, VV; Valente, AA; Snijkers, FMM; Cooymans, JFC; Luyten, JJ; Marques, FMB
nationality International
journal JOURNAL OF MEMBRANE SCIENCE
author keywords mixed-conducting membrane; methane activation; synthesis gas; oxygen permeation; composite ceramics; natural gas conversion
keywords METHANE OXIDATION; THERMOMECHANICAL PROPERTIES; OXYGEN PERMEABILITY; ION-TRANSPORT; SYNTHESIS GAS; CONVERSION; STABILITY; PERMEATION; DENSE; CO2
abstract The stability and oxygen permeability of dense tubular membranes, made of (SrFeO(3-infinity))(0.7)(SrAl(2)O(4))(0.3) (SFSA) composite by cold isostatic pressing, were assessed under air/CO(2) and air/(CH(4) + CO(2)) gradients at 973-1173K. Mixed-conducting SFSA, comprising SrFe(Al)O(3-delta) perovskite-like and SrAl(2)O(4)-based phases, was selected as a model membrane material for the natural gas conversion reactors due to its attractive oxygen transport, catalytic and thermomechanical properties. As partial dissolution of SrAl(2)O(4) in the perovskite-like component leads to strontium deficiency of the perovskite phase, the composite exhibits an improved stability with respect to interaction with CO(2), although thermogravimetric analysis showed that carbon dioxide adsorption on SFSA is still significant. No degradation was revealed in the course of oxygen permeation tests during 200-300 h with subsequent scanning electron microscopy inspection. However, contrary to that observed for SFSA powders, methane conversion in the tubular SFSA membranes without surface modification results in predominant total combustion caused by the slow kinetics of the reforming reactions. Significantly higher conversion efficiency and synthesis gas yields were achieved passing the pre-reacted gas mixtures into an additional reactor with Pt/LaNiO(3)/Al(2)O(3) catalyst bed at the tubular membrane outlet. (C) 2008 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0376-7388
year published 2008
volume 319
issue 1-2
beginning page 141
ending page 148
digital object identifier (doi) 10.1016/j.memsci.2008.03.028
web of science category Engineering, Chemical; Polymer Science
subject category Engineering; Polymer Science
unique article identifier WOS:000256991200018
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 6.578
5 year journal impact factor 6.656
category normalized journal impact factor percentile 95.461
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg