Hsuan-Chih Wu, Young Ku, Yi-Syuan Huang, Niels Michiel Moed This email address is being protected from spambots. You need JavaScript enabled to view it.

Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan


 

Received: June 19, 2020
Revised: October 13, 2020
Accepted: October 23, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.2020.06.0322  

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Cite this article:

Wu, H.C., Ku, Y., Huang, Y.S. and Moed, N.M. (2020). Fabrication of Iron-based Oxygen Carriers on Various Supports for Chemical Looping Hydrogen Generation. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.2020.06.0322


HIGHLIGHTS

  • Fe2O3/Al2O3 and Fe2O3/TiO2/Al2O3 oxygen carriers were compared in CLHG.
  • In all tests, Fe2O3/Al2O3 displayed superior steam conversion.
  • Optimal steam conversion took place at a reaction temperature of 900°C.
  • More steam led to a higher H2 production but a lower overall steam conversion.
  • Over 50 cycles, Fe2O3/TiO2/Al2O3 conversion was higher from the second cycle.
 

ABSTRACT


Fe2O3/Al2O3 and Fe2O3/TiO2/Al2O3 oxygen carriers were fabricated and evaluated for chemical looping hydrogen generation (CLHG) using a TGA system and a fixed-bed reactor. Oxygen carriers were converted to around 33% in a fixed-bed reactor to ensure uniform reduction. The reduced oxygen carrier was tested for steam generation, where in all cases Fe2O3/Al2O3 displayed a better conversion than Fe2O3/TiO2/Al2O3. It was found that increasing the reaction temperature from 800 to 850 °C had little effect for either oxygen carrier, but a further increase to 900 °C resulted in an increased steam conversion. A higher steam flow rate caused a lower overall steam conversion but a higher H2 production. A higher feed rate of reduced oxygen carrier let to a higher steam conversion up to a rate of 18.4 and 14.9 g min-1 for Fe2O3/Al2O3 and Fe2O3/TiO2/Al2O3, respectively. A final comparison was performed with up to 50 redox cycles, where Fe2O3/Al2O3 showed superior reactivity in the first cycles but ended at a conversion of 54.6% with Fe2O3/TiO2/Al2O3 ending at a conversion of 64.6%.


Keywords: Chemical looping hydrogen generation (CLHG); Fe2O3/Al2O3; Fe2O3/TiO2/Al2O3; Oxygen carrier; Moving-bed reactor.




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