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Understanding the thermochemical behavior of La0.6Sr0.4Co0.2 Fe0.8O3 and Ce0.9 Gd0.1O_Co oxygen transport membranes under real oxy-combustion process conditions

Portillo, E., Reina, T.R., Vega, F., Cano, M. and Navarrete, B. (2019) Understanding the thermochemical behavior of La0.6Sr0.4Co0.2 Fe0.8O3 and Ce0.9 Gd0.1O_Co oxygen transport membranes under real oxy-combustion process conditions Solid State Ionics.

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MANUSCRIPT _Understanding the thermochemical behavior of LSCF andCGO_rev 1.docx - Accepted version Manuscript

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Abstract

O transport membranes (OTM) are a promising alternative to conventional systems of air separation based on cryogenic distillation for oxy-fuel combustion power plants. In this work, a systematic study of the thermochemical stability of La0.6Sr0.4Co0.2 Fe0.8O3 (perovskite-type) and cobalt doped Ce0.9Gd0.1O (fluorite-type) is proposed. The experiments were developed in a laboratory scale facility, which is able to mimic realistic oxy-fuel combustion flue gas containing SOx, NOx, H2O and CO2. In order to understand the thermochemical behavior of this type of materials, a full characterization analysis of the tested samples using a wide portfolio of analytical techniques such as X-ray diffraction (XRD), X-ray fluorescence (XRF), infrared spectroscopy (ATR-FTIR), Raman spectroscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS) and Brunauer−Emmett−Teller analysis (BET) has been carefully discussed. Our data revealed the superior stability of the CGO samples in comparison with the LSCF at all the test conditions studied in this work. The formation of crystalline and amorphous sulphates and carbonates are evident for the LSCF while for the CGO samples do not react with SOX and barely form carbonates. The presence of silicon species – typically ignored in academic works – has been detected, pointing its relevance for real applications.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Portillo, E.
Reina, T.R.t.ramirezreina@surrey.ac.uk
Vega, F.
Cano, M.
Navarrete, B.
Date : 2019
Funders : Department of Chemical and Process Engineering, FEPS, University of Surrey, University of Surrey, Engineering and Physical Sciences Research Council (EPSRC), Royal Society
Copyright Disclaimer : © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : ITM; Oxy-fuel; LSFC; CGO; Thermochemical stability
Related URLs :
Depositing User : Clive Harris
Date Deposited : 01 Aug 2019 08:18
Last Modified : 13 Aug 2020 21:46
URI: http://epubs.surrey.ac.uk/id/eprint/852336

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