CO2 utilization via the reverse-water-gas-shift (RWGS) reaction to produce CO for long chain hydrocarbon production is a potentially scalable method to help mitigate rising global CO2 emissions if high CO yields and reaction rates can be achieved at low reaction temperatures. Here, we investigated Fe2O3/ZrO2 as a chemical looping (RWGS-CL) metal oxide at low reaction temperatures (500°C for both oxidation and reduction steps). We found that Fe2O3/ZrO2 possesses a high CO yield of 386 mL CO/g-Fe2O3/cycle, which is roughly four times higher than previously reported metal oxides at this temperature. The measured CO yield of 386 mL CO/g-Fe2O3/cycle remained relatively stable for 350 redox cycles or 12.1 days on stream with some observed deactivation due to carbon formation; carbon formation during RWGS-CL has not been previously reported. Finally, we performed a process design and technoeconomic analysis using collected experimental data as inputs to the model to show that the cost of CO production in RWGS-CL with Fe2O3/ZrO2 can be decreased via low temperature operation.

Low temperature CO2 conversion via reverse water-gas shift thermochemical looping with supported iron oxide

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