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Terbium oxide‐based solar thermochemical CO2 splitting cycle: A thermodynamic investigation

Rahul R. Bhosale

Greenhouse Gases: Science and Technology, 2020, vol. 10, issue 4, 703-714

Abstract: A Tb2O3/TbO2 thermochemical CO2 splitting cycle was thermodynamically scrutinized in this study. Equilibrium and efficiency analysis are the two major sections of this thermodynamic investigation. As a first step of the thermodynamic analysis, the temperatures required for the thermal reduction (TR) of Tb2O3 and the re‐oxidation of the TbO2 via CO2 splitting (CS) reaction were identified. The equilibrium analysis indicates that the temperature in the range of 2234–2530 K was required for the increase in the percentage TR of Tb2O3 from 5% to 100%. The efficiency analysis was conducted by following a process flow arrangement, which includes a solar reactor, a CS reactor, a CO2 heater, multiple coolers, and a fuel cell. The obtained results indicate that theηsolar−to−fuel−Tb−CS increased from 3.4% to 5.6% when the %TR‐Tb upsurged from 5% to 25%. A further rise in the %TR‐Tb from 25% to 100%, however, resulted in a decrease in theηsolar−to−fuel−Tb−CS from 5.6% to 3.5%. By employing 100% heat recuperation, the maximum ηsolar−to−fuel−HR−Tb−CS = 9.6% attained at a %TR‐Tb equal to 20% (TH = 2296 K). © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

Date: 2020
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