Journal
FUEL PROCESSING TECHNOLOGY
Volume 164, Issue -, Pages 69-79Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fuproc.2017.04.019
Keywords
CO2 capture; Chemical looping combustion (CLC); Chemical looping with oxygen uncoupling (CLOU); Oxygen carriers; Manganese oxides; Iron oxides
Funding
- Spanish Ministry for Economy and Competitiveness [ENE2013-45454-R, ENE2014-56857-R, ENE2016-77982-R]
- Spanish National Research Council (CSIC) [2014-80E101]
- FPI Fellowship
- European Regional Development Fund (ERDF)
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Chemical looping combustion (CLC) involves the use of a solid oxygen carrier to transport the oxygen from the air to a fuel. Attention has recently been focused on oxygen carriers based on Mn-Fe mixed oxides because they are cheap materials that are able to release oxygen at high temperature, the so-called oxygen uncoupling step. The aim of this work was to assess the use of (Mn0.77Fe0.23)(2)O-3 material as an oxygen carrier with the ability to transport oxygen both by reduction with gaseous fuels and by oxygen uncoupling, i.e. typical mechanisms in CLC and in Chemical Looping with Oxygen Uncoupling (CLOU), respectively. The particles prepared by mechanical mixing were screened to obtain particles of sufficient reactivity and mechanical strength for use in a fluidized bed reactor. The preparation methodology and calcining temperature were varied. The reactivity of one selected material was evaluated by performing redox cycles both in a TGA and a batch fluidized-bed reactor. Thus, its behaviour was assessed during both decomposition-regeneration of bixbyite phase [(Mn0.77Fe0.23)(2)O-3] in CLOU and the reduction-oxidation of spinel phase [(Mn0.77Fe0.23)(3)O-4] with gaseous fuels, i.e. H-2, CO and CH4. Its oxygen uncoupling and re-oxidation capability was highly influenced by the reaction temperature and oxygen concentration. On the other hand, CLC redox cycles with gaseous fuels showed high reactivity with H-2 and CO and high oxygen transport capacity by reduction to mangano-wustite phase [(Mn0.77Fe0.23)O]. Good fluid-dynamic behaviour was observed for the oxygen carrier particles along the redox cycles without agglomeration problems, regardless of the operating conditions used in the batch fluidized-bed reactor. Thus, the selected material was considered a promising candidate for use in both in CLC with syngas and CLC with coal. (C) 2017 Elsevier B.V. All rights reserved.
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