Solar thermochemical conversion ofCO2into fuels using gadoliniumsesquioxide: A thermodynamic efficiency analysis

The thermodynamic efficiency analysis of the Gd2O3/GdO-based solar-driven thermochemical CO(2)splitting (Gd-CS) cycle is conducted. The equilibrium, as well as efficiency analysis, is carried out by obtaining the thermodynamic data from the HSC Chemistry 9.9 software. The equilibrium analysis is performed to identify the temperatures required for partial thermal reduction of Gd2O3(TR-Gd). The results obtained indicate that the TR-Gd from 5% to 100% is feasible in the temperature range of 2237 to 2530 K. The efficiency analysis indicates that the rise in the %TR-Gd considerably affects the process parameters associated with the Gd-CS cycle. For example,Q?Gd2O3-red mml:mfenced close=) open=( separators=partial-Gd-CSandQ?CO2-heating-Gd-CSare increased by 1568.5 kW and 47.7 kW due to the rise in %TR-Gd from 5% to 100%.eta(solar - to - fuel - Gd - CS)is first increased to 5.5% when %TR-Gd is escalated from 5% to 25% and then decreased to 3.5% with a rise in %TR-Gd from 25% to 100%. By employing the HR, the eta(solar - to - fuel - Gd - CS)was further enhanced up to 7.2% (maximum value at 60% heat recuperation) at %TR-Gd equal to 20%.

Automated summary

The study conducted thermodynamic efficiency analysis of the Gd2O3/GdO-based solar-driven thermochemical CO(2) splitting cycle. The results showed that the rise in %TR-Gd significantly affected the process parameters associated with the cycle, and the efficiency was enhanced up to 7.2% with heat recuperation at 20% TR-Gd.