Terbium oxide-based solar thermochemical CO(2)splitting cycle: A thermodynamic investigation

摘要

A Tb(2)O3/TbO(2)thermochemical CO(2)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 Tb(2)O(3)and the re-oxidation of the TbO(2)via CO(2)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 Tb(2)O(3)from 5% to 100%. The efficiency analysis was conducted by following a process flow arrangement, which includes a solar reactor, a CS reactor, a CO(2)heater, multiple coolers, and a fuel cell. The obtained results indicate that the eta solar-to-fuel-Tb-CSincreased 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 the eta solar-to-fuel-Tb-CSfrom 5.6% to 3.5%. By employing 100% heat recuperation, the maximum eta solar-to-fuel-HR-Tb-CS= 9.6% attained at a %TR-Tb equal to 20% (TH= 2296 K). (c) 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.