Syngas and CO production via cyclic coke oven gas reforming and CO2 splitting with integrated experimental, economic, and environmental assessment

A cyclic redox process integrating coke oven gas reforming (COGR) and CO 2 splitting (CS) is proposed for the production of syngas and CO. The feasibility of this two-step cycle critically depends on the precise redox properties of metal oxides, enabling stable operation, energy conservation, carbon neutrality, and industrial scalability. This study evaluated the economic and environmental viability of the COGR–CS process based on experimental results using SrFeO 3 . Extent of reduction assessment revealed that SrFeO 3 exhibited higher reactivity toward CH 4 and efficient CO 2 -driven reoxidation under CH 4 reforming–CS conditions, compared to Fe 2 O 3 . At coke oven gas (COG) emission temperatures, the productions of H 2 and CO were enhanced by CH 4 decomposition and the reverse Boudouard reaction, respectively. Partial-COGR experiments with controlled feed compositions demonstrated that CO 2 in COG reoxidized oxygen vacancies in SrFeO 3-δ during COGR. Quantitative analysis of reaction progress was consistent with the structural evolution of SrFeO 3 and the carbon removal behavior during partial-COGR–CS. Long-term operation confirmed the stable production of syngas and CO, with high reoxidation (94.2 %), carbon removal (95.6 %), and CO 2 conversion (99.6 %) maintained under redox equilibrium. Process simulation based on accurate redox properties aligned with equilibrium data, validating its predictive reliability. The integrated COGR–CS system (100 tonnes/day CO) achieved favorable cost (559.4 USD/tCO) and CO 2 intensity (1.015 kg CO 2 /kg CO) compared to CO 2 electrolysis, owing to its direct thermal energy utilization and the conversion of greenhouse gases into value-added chemicals, offering a practical and scalable route to low-carbon, circular industry. • Enhances syngas and CO production via coke oven gas reforming and CO2 splitting. • Confirms long-term stability with high reoxidation, carbon removal and CO2 conversion. • Validates simulation accuracy with experimental redox properties and equilibrium data. • Assesses cost and carbon impact of the integrated redox system using greenhouse gases.