Fabrication of Iron-based Oxygen Carriers on Various Supports for Chemical Looping Hydrogen Generation

Fe_2O_3/Al_2O_3 and Fe_2O_3/TiO_2/Al_2O_3 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 carr...

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Bibliographic Details
Published in:Aerosol and Air Quality Research 2021-04, Vol.21 (4), p.1-13
Main Authors: Wu, Hsuan-Chih, Ku, Young, Huang, Yi-Syuan, Moed, Niels Michiel
Format: Article
Language:English
Subjects:
Aluminum oxide
Climate change
Conversion
Fabrication
Feed rate
Ferric oxide
Flow rates
Flow velocity
Hydrogen
Hydrogen production
Metal oxides
Nitrogen
Outdoor air quality
Oxygen
Reactors
Sintering
Steam flow
Steam generation
Synthesis gas
Titanium
Titanium dioxide
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Summary:Fe_2O_3/Al_2O_3 and Fe_2O_3/TiO_2/Al_2O_3 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 Fe_2O_3/Al_2O_3 displayed a better conversion than Fe_2O_3/TiO_2/Al_2O_3. 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 H_2 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 Fe_2O_3/Al_2O_3 and Fe_2O_3/TiO_2/Al_2O_3, respectively. A final comparison was performed with up to 50 redox cycles, where Fe_2O_3/Al_2O_3 showed superior reactivity in the first cycles but ended at a conversion of 54.6% with Fe_2O_3/TiO_2/Al_2O_3 ending at a conversion of 64.6%.
ISSN:1680-8584
2071-1409
DOI:10.4209/aaqr.2020.06.0322