Thermodynamic assessment of hydrogen production via solar thermochemical cycle based on MoO2/Mo by methane reduction
Received date: 14 May 2019
Accepted date: 26 Aug 2019
Published date: 15 Mar 2020
Copyright
Inspired by the promising hydrogen production in the solar thermochemical (STC) cycle based on non-stoichiometric oxides and the operation temperature decreasing effect of methane reduction, a high-fuel-selectivity and CH4-introduced solar thermochemical cycle based on MoO2/Mo is studied. By performing HSC simulations, the energy upgradation and energy conversion potential under isothermal and non-isothermal operating conditions are compared. In the reduction step, MoO2: CH4 = 2 and 1020 K<Tred<1600 K are found to be most favorable for syngas selectivity and methane conversion. Compared to the STC cycle without CH4, the introduction of methane yields a much higher hydrogen production, especially at the lower temperature range and atmospheric pressure. In the oxidation step, a moderately excessive water is beneficial for energy conversion whether in isothermal or non-isothermal operations, especially at H2O: Mo= 4. In the whole STC cycle, the maximum non-isothermal and isothermal efficiency can reach 0.417 and 0.391 respectively. In addition, the predicted efficiency of the second cycle is also as high as 0.454 at Tred = 1200 K and Toxi = 400 K, indicating that MoO2 could be a new and potential candidate for obtaining solar fuel by methane reduction.
Jiahui JIN , Lei WANG , Mingkai FU , Xin LI , Yuanwei LU . Thermodynamic assessment of hydrogen production via solar thermochemical cycle based on MoO2/Mo by methane reduction[J]. Frontiers in Energy, 2020 , 14(1) : 71 -80 . DOI: 10.1007/s11708-019-0652-9
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