能源化学(英文版) ›› 2019, Vol. 38 ›› Issue (11): 177-184.DOI: 10.1016/j.jechem.2019.03.035

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Theoretical assessment of hydrogen production and multicycle energy conversion via solar thermochemical cycle based on nonvolatile SnO2

Mingkai Fua, Huajun Xub, Haitao Mac, Xin Lia,d   

  1. a Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    b Department of Chemistry, University of Washington, Seattle, United States;
    c CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
    d University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2019-01-07 修回日期:2019-03-08 出版日期:2019-11-15 发布日期:2020-12-18
  • 通讯作者: Xin Li, drlixin@mail.iee.ac.cn
  • 基金资助:
    The authors thank financial supports from the National Natural Science Foundation of China (21773293, 21603264), CAS Pioneer Hundred Talents Program (J. Di), The National Key Research and Development Program of China (2016YFA0203301), and Key Research Program of Frontier Science of Chinese Academy of Sciences (QYZDB-SSW-SLH031).

Theoretical assessment of hydrogen production and multicycle energy conversion via solar thermochemical cycle based on nonvolatile SnO2

Mingkai Fua, Huajun Xub, Haitao Mac, Xin Lia,d   

  1. a Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    b Department of Chemistry, University of Washington, Seattle, United States;
    c CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
    d University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-01-07 Revised:2019-03-08 Online:2019-11-15 Published:2020-12-18
  • Contact: Xin Li, drlixin@mail.iee.ac.cn
  • Supported by:
    The authors thank financial supports from the National Natural Science Foundation of China (21773293, 21603264), CAS Pioneer Hundred Talents Program (J. Di), The National Key Research and Development Program of China (2016YFA0203301), and Key Research Program of Frontier Science of Chinese Academy of Sciences (QYZDB-SSW-SLH031).

摘要: A kind of solar thermochemical cycle based on methanothermal reduction of SnO2 is proposed for H2 and CO production. We find that the oxygen release capacity and thermodynamic driven force for methanothermal reduction of SnO2 are large, and suggest CH4:SnO2=2:1 as the feasible reduction condition for achieving high purities of syngas and avoiding vaporization of produced Sn. Subsequently, the amount of H2 and energetic upgrade factors under different oxidation conditions are compared, in which excess water vapor is found beneficial for hydrogen production and fuel energetic upgradation. Moreover, the effect of incomplete recovery of SnO2 on the subsequent cycle is underscored and explained. After accounting for factors such as isothermal operation and cycle stability, CH4:SnO2=2:1 and H2O:Sn=4:1 are suggested for highest solar-to-fuel efficiency of 46.1% at nonisothermal condition, where the reduction and oxidation temperature are 1400 and 600 K, respectively.

关键词: SnO2/Sn based solar-chemical cycle, Hydrogen production, Non-volatile redox, Isothermal and nonisothermal operation, Syngas production

Abstract: A kind of solar thermochemical cycle based on methanothermal reduction of SnO2 is proposed for H2 and CO production. We find that the oxygen release capacity and thermodynamic driven force for methanothermal reduction of SnO2 are large, and suggest CH4:SnO2=2:1 as the feasible reduction condition for achieving high purities of syngas and avoiding vaporization of produced Sn. Subsequently, the amount of H2 and energetic upgrade factors under different oxidation conditions are compared, in which excess water vapor is found beneficial for hydrogen production and fuel energetic upgradation. Moreover, the effect of incomplete recovery of SnO2 on the subsequent cycle is underscored and explained. After accounting for factors such as isothermal operation and cycle stability, CH4:SnO2=2:1 and H2O:Sn=4:1 are suggested for highest solar-to-fuel efficiency of 46.1% at nonisothermal condition, where the reduction and oxidation temperature are 1400 and 600 K, respectively.

Key words: SnO2/Sn based solar-chemical cycle, Hydrogen production, Non-volatile redox, Isothermal and nonisothermal operation, Syngas production