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Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water–gas shift (SE–WGS) reaction for hydrogen production

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  • Živković, Luka A.
  • Pohar, Andrej
  • Likozar, Blaž
  • Nikačević, Nikola M.

Abstract

Hydrogen, an important energy carrier of the future, produces no pollution and has a high content of energy. It is formed as a direct product of the water–gas shift (WGS) reaction, which occurs in various processes for the production of hydrogen, ammonia, methanol and different hydrocarbons, and is also a side reaction during the steam reforming of hydrocarbons and Fisher–Tropsch synthesis. Since it is an equilibrium reaction, it may be intensified by the selective removal of the products, which can lead to higher yields and energy savings. In this study, carbon dioxide was removed through chemisorption on CaO particles. In the first part, the WGS reaction kinetics were obtained on an industrial iron-chromium catalyst in a packed-bed reactor. In the second part, the CO2 chemisorption kinetics on CaO sorbent particles were examined, simultaneously with the WGS reaction. A modified dynamic shrinking-core model was used to describe the carbonation reaction, which accounted for the non-ideal core shrinkage. With the introduction of a sorbent conversion-dependent effective diffusion coefficient, the model perfectly reproduced the obtained experimental results. Valuable insight into the sorption-enhanced process was obtained with the full concentration profiles of the species involved (CO, H2O, CO2, H2) in time and space, as well as the conversion of the sorbent particles, also in the radial dimension. The developed model was used to simulate a cyclic sorption-enhanced water–gas shift operation in a revolver-type manner which allows for continuous sorbent regeneration and a much higher-than-equilibrium hydrogen production for various operational parameters. The significance of the model lies in the precise replication of the experimental results and its applicability to the vast area of the newly-emerged industrial sorption-enhanced technologies.

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  • Živković, Luka A. & Pohar, Andrej & Likozar, Blaž & Nikačević, Nikola M., 2016. "Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water–gas shift (SE–WGS) reaction for hydrogen production," Applied Energy, Elsevier, vol. 178(C), pages 844-855.
    • Handle: RePEc:eee:appene:v:178:y:2016:i:c:p:844-855
    DOI: 10.1016/j.apenergy.2016.06.071
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    References listed on IDEAS

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    1. Gao, Wanlin & Zhou, Tuantuan & Gao, Yanshan & Wang, Qiang, 2019. "Enhanced water gas shift processes for carbon dioxide capture and hydrogen production," Applied Energy, Elsevier, vol. 254(C).
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    3. Shi, Xunwang & Zhang, Kaidi & Cheng, Qunpeng & Song, Guangsen & Fan, Guozhi & Li, Jianfen, 2019. "Promoting hydrogen-rich syngas production through catalytic cracking of rape straw using Ni-Fe/PAC-γAl2O3 catalyst," Renewable Energy, Elsevier, vol. 140(C), pages 32-38.
    4. Xin, Yanbin & Sun, Bing & Zhu, Xiaomei & Yan, Zhiyu & Zhao, Xiaotong & Sun, Xiaohang, 2017. "Hydrogen production from ethanol decomposition by pulsed discharge with needle-net configurations," Applied Energy, Elsevier, vol. 206(C), pages 126-133.
    5. Risthaus, Kai & Bürger, Inga & Linder, Marc & Schmidt, Matthias, 2020. "Numerical analysis of the hydration of calcium oxide in a fixed bed reactor based on lab-scale experiments," Applied Energy, Elsevier, vol. 261(C).
    6. Gil, María V. & Rout, Kumar R. & Chen, De, 2018. "Production of high pressure pure H2 by pressure swing sorption enhanced steam reforming (PS-SESR) of byproducts in biorefinery," Applied Energy, Elsevier, vol. 222(C), pages 595-607.
    7. Lee, Chan Hyun & Lee, Ki Bong, 2017. "Sorption-enhanced water gas shift reaction for high-purity hydrogen production: Application of a Na-Mg double salt-based sorbent and the divided section packing concept," Applied Energy, Elsevier, vol. 205(C), pages 316-322.

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