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The enhancing mechanism of calcium oxide on water gas shift reaction for hydrogen production

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  • Li, Bin
  • Wei, Liangyuan
  • Yang, Haiping
  • Wang, Xianhua
  • Chen, Hanping

Abstract

To figure out the role of CaO (calcium oxide) on WGS (water gas shift) reaction and the related enhancing mechanism, the WGS reaction of absorption enhanced biomass steam gasification with CaO addition was performed with thermodynamic simulation and bench-scale experiment. The results showed that, the experimental WGS reaction was kinetically limited at lower temperature and far from equilibrium without CaO addition. However, much higher H2 concentration could be obtained with CaO addition, as CaO acted not only as a CO2 absorbent, but also a catalyst for WGS reaction. And the enhancing effect showed obvious segmentation feature with the reaction time streamline due to the variation of CaO carbonation performance. Typical product gas composition in stable region (10–70 min) was approximately 71 vol% H2, 22 vol% CO and 7 vol% CO2, with CO2 absorption rate of 87.41%–91.44%, CO conversion rate of above 75.5%, and enhancement ratio of CaO of about 81%. The possible catalytic mechanism for absorption enhanced WGS reaction could be concluded as carboxyl mechanism, while CaO activated H2O dissociation forming H* and OH*, thus further reacted with CO* to generate COOH* and then decomposed to CO2 and H*, and two H* met to form H2. The H2O/CO increasing was favorable for WGS reaction.

Suggested Citation

  • Li, Bin & Wei, Liangyuan & Yang, Haiping & Wang, Xianhua & Chen, Hanping, 2014. "The enhancing mechanism of calcium oxide on water gas shift reaction for hydrogen production," Energy, Elsevier, vol. 68(C), pages 248-254.
    • Handle: RePEc:eee:energy:v:68:y:2014:i:c:p:248-254
    DOI: 10.1016/j.energy.2014.02.088
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    References listed on IDEAS

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    1. Tock, Laurence & Maréchal, François, 2012. "Co-production of hydrogen and electricity from lignocellulosic biomass: Process design and thermo-economic optimization," Energy, Elsevier, vol. 45(1), pages 339-349.
    2. Taufiq-Yap, Y.H. & Sivasangar, S. & Salmiaton, A., 2012. "Enhancement of hydrogen production by secondary metal oxide dopants on NiO/CaO material for catalytic gasification of empty palm fruit bunches," Energy, Elsevier, vol. 47(1), pages 158-165.
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    1. Wenelska, Karolina & Michalkiewicz, Beata & Chen, Xuecheng & Mijowska, Ewa, 2014. "Pd nanoparticles with tunable diameter deposited on carbon nanotubes with enhanced hydrogen storage capacity," Energy, Elsevier, vol. 75(C), pages 549-554.
    2. Li, Shouzhuang & Inayat, Muddasser & Järvinen, Mika, 2023. "Steam gasification of polyethylene terephthalate (PET) with CaO in a bubbling fluidized bed gasifier for enriching H2 in syngas with Response Surface Methodology (RSM)," Applied Energy, Elsevier, vol. 348(C).
    3. Magoua Mbeugang, Christian Fabrice & Li, Bin & Lin, Dan & Xie, Xing & Wang, Shuaijun & Wang, Shuang & Zhang, Shu & Huang, Yong & Liu, Dongjing & Wang, Qian, 2021. "Hydrogen rich syngas production from sorption enhanced gasification of cellulose in the presence of calcium oxide," Energy, Elsevier, vol. 228(C).
    4. Li, Bin & Magoua Mbeugang, Christian Fabrice & Huang, Yong & Liu, Dongjing & Wang, Qian & Zhang, Shu, 2022. "A review of CaO based catalysts for tar removal during biomass gasification," Energy, Elsevier, vol. 244(PB).
    5. Li, Chongcong & Liu, Rui & Zheng, Jinhao & Zhang, Yan, 2023. "Thermodynamic study on the effects of operating parameters on CaO-based sorption enhanced steam gasification of biomass," Energy, Elsevier, vol. 273(C).
    6. Lu, Chen & Zhang, Xitong & Gao, Ying & Lin, Yunhao & Xu, Jiayu & Zhu, Chong & Zhu, Yuezhao, 2021. "Parametric study of catalytic co-gasification of cotton stalk and aqueous phase from wheat straw using hydrothermal carbonation," Energy, Elsevier, vol. 216(C).

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    More about this item

    Keywords

    CaO; Water gas shift (WGS); H2 production; Enhancing mechanism;
    All these keywords.

    JEL classification:

    • H2 - Public Economics - - Taxation, Subsidies, and Revenue

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