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Steam synergic effect on oxygen carrier performance and WGS promotion ability of iron-oxides

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Listed:
  • Chen, Qindong
  • Hu, Song
  • Xu, Qiyong
  • Su, Sheng
  • Wang, Yi
  • Xu, Kai
  • He, Limo
  • Xiang, Jun

Abstract

During chemical looping process, the presence of H2O has great effect on oxygen transfer and hydrogen generation process, thus making the reaction become more complicated. In this study, Fe2O3 was chosen as the original oxygen carrier and its oxygen carrying capacity and reactivity under different H2O/CO molar ratios were systematically investigated. The chemical compositions of reacted iron-based oxides were measured by Mössbauer spectroscopy. According to Mössbauer spectroscopy results and product gas analysis, the paper gave further insight into the impact of H2O on oxygen carrying property and catalyzed effect of iron-based oxides. The results indicated that: (i) The oxygen carrying capacity of Fe2O3 decreased from 45.93% to 11.33% (the theoretical maximum to be 100%) when the H2O/CO ratio varied from 0:1 to 2:1. (ii) The maximum CO2 conversion rate, which reflects the reduction reactivity, was closely related to H2O/CO ratio and achieved the maximum (4.83%/min) at a H2O/CO ratio of 1:1. (iii) The presence of H2O could promote the reduction process of Fe2O3 to generate Fe3O4. (iv) Both Fe3O4 and FeO which existed as reduction states of iron oxides had ability to promote the water-gas shift reaction during oxygen transfer process.

Suggested Citation

  • Chen, Qindong & Hu, Song & Xu, Qiyong & Su, Sheng & Wang, Yi & Xu, Kai & He, Limo & Xiang, Jun, 2021. "Steam synergic effect on oxygen carrier performance and WGS promotion ability of iron-oxides," Energy, Elsevier, vol. 215(PA).
    • Handle: RePEc:eee:energy:v:215:y:2021:i:pa:s0360544220322246
    DOI: 10.1016/j.energy.2020.119117
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    References listed on IDEAS

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