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Application of chromium oxide-based redox reactions for hydrogen production via solar thermochemical splitting of water

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submitted on 2023-10-11, 06:34 and posted on 2023-10-11, 07:11 authored by Rahul R. Bhosale

Thermodynamic equilibrium, as well as efficiency analysis of the Cr2O3/Cr water splitting (Cr-WS) cycle, was conducted in this study. The thermodynamic properties required for the computations were obtained from an HSC Chemistry 9.9 software. An increase in thermal reduction (TR) temperature (TH) from 1800 K to 2230 K was responsible for the rise in the percentage TR of Cr2O3 (Tr-Cr) from 0% to 100%. The equilibrium analysis additionally indicates that the re-oxidation of Cr into Cr2O3 via WS reaction is feasible at any temperature from 300 to 3000 K (we have selected 1300 K for this study). The efficiency analysis indicates that the Qsolar-reactor-Cr-WS and Qsolar-heater-Cr-WS were enhanced by 3636.8 kW and 260.0 kW due to the increment in the TH from 1800 K to 2230 K. The increase in the Qsolar-reactor-Cr-WS and Qsolar-heater-Cr-WS resulted into a rise in the Qsolar-cycle-Cr-WS by 3896.8 kW. Theηsolar to fuel Cr WSincreased from 9.5% to 26.4% when the TH was augmented from 1800 K to 2000 K. A further rise in the TH from 2000 K to 2230 K resulted in a reduction in theηsolar to fuel Cr WS from 26.4% to 21.3%. After employing the 100% heat recuperation, theηsolar to fuel HR Cr WS of the Cr-WS cycle was improved up to 48.3% at TH = 2000 K.

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Published in: Fuel
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Publication Year

  • 2020

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This Item is licensed under the Creative Commons Attribution 4.0 International License

Institution affiliated with

  • Qatar University
  • College of Engineering - QU