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Effect of operating parameters for CO2 capture from syngas of supercritical water gasification using K2CO3/γ-Al2O3 composite adsorbent

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Abstract

To increase the value of syngas produced by supercritical water gasification (SCWG), K2CO3/γ-Al2O3 composite adsorbents were used to remove CO2 from crude syngas with high content of CO2. Two kinds of γ-Al2O3 particles were evaluated and compared as K2CO3 carriers. Characterization using SEM and N2 adsorption/desorption found that K2CO3/nano-γ-Al2O3 had better dispersibility, larger specific surface area, and pore volume than K2CO3/normal γ-Al2O3; this increased the chance of mass transfer between K2CO3 and CO2. The effects of K2CO3 load ratio, adsorption temperature, gas flow rate, and regeneration temperature on CO2 adsorption performance of K2CO3/nano-γ-Al2O3 were also discussed. K2CO3/nano-γ-Al2O3 had the optimum CO2 adsorption capacity of 2.029 mmol/g at 60 °C. Low gas flow rate was found to produce better CO2 adsorption performance. And the adsorbent could be fully regenerated by heating. Moreover, the adsorption of CO2 by K2CO3/nano-γ-Al2O3 increased the heating value of the syngas from 8.56 MJ/Nm3 to 13.51 MJ/Nm3 and H2 concentration from 41.6% to 75.65%. High selectivity of CO2/H2 (23.5) and (CO2 + CO + CH4)/H2 (17.6) from K2CO3/nano-γ-Al2O3 revealed that it could be a suitable adsorbent for syngas upgrading.

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Acknowledgements

The authors appreciate the financial support from the National Natural Science Foundation, China (51976196), and International Cooperation Project of Zhejiang Province (2019C04026).

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Authors and Affiliations

  1. Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou, 310014, China

    Mi Yan, Yan Zhang, Qun Huan, Xuanyou Zhou & Haryo Wibowo

  2. Zhejiang Zheneng Fuxing Fuel Co, Ltd, Hangzhou, 310013, China

    Yucai Song

  3. Zhejiang Zheneng Xingyuan Energy Saving Technology Co. Ltd, Hangzhou, 310013, China

    Caimeng Yu

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Contributions

Mi Yan involved in writing—review & editing, supervision, funding acquisition. Yan Zhang took part in investigation, writing an original draft, data curation. Qun Huan took part in resources and supervision. Yucai Song took part in resources and investigation. Xuanyou Zhou took part in investigation and formal analysis. Haryo Wibowo involved in methodology and supervision. Caimeng Yu took part in resources and methodology.

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Correspondence to Mi Yan.

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Highlights

• Effect of different γ-Al2O3 types as support of K2CO3 adsorbent of CO2.

• K2CO3/nano-γ-Al2O3 exhibited the highest CO2 adsorption capacity of 2.029 mmol/g at 60 °C.

• The CO2/H2 selectivity of K2CO3/nano-γ-Al2O3 was increased to 23.5.

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Yan, M., Zhang, Y., Huan, Q. et al. Effect of operating parameters for CO2 capture from syngas of supercritical water gasification using K2CO3/γ-Al2O3 composite adsorbent. Biomass Conv. Bioref. 14, 3667–3677 (2024). https://doi.org/10.1007/s13399-022-02649-0

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