Hydrogen production by chemical looping steam reforming of coke oven gas via La1-φCuxNiyFe1-x-yO3-λ

Abstract

To realize the clean and efficient utilisation of coke oven gas, the chemical looping steam reforming technology was used to co-produce high purity H₂ and syngas. Fe–Ni-based perovskite oxygen carriers with excellent partial oxidation performance were selected in this paper, through the strategies of B-site doping and A-site defect, the lattice oxygen transport was facilitated, which enhanced the anti-carbon deposition ability and reforming performance. The results indicated that La_0.7Cu_0.15Ni_0.1Fe_0.75O_3-λ had a favorable oxygen supply capacity for partial methane oxidation in coke oven gas. At 850 °C, using La_0.7Cu_0.15Ni_0.1Fe_0.75O_3-λ, the methane conversion could reach 67 %, and the hydrogen production and purity in the steam regeneration stage could reach 3.56 mmol g⁻¹ and 99.90 %, respectively. Simultaneously, La_0.7Cu_0.15Ni_0.1Fe_0.75O_3-λ demonstrated excellent reaction performance and cycle stability. This research established an experimental foundation for designing oxygen carriers tailored for hydrogen production through the chemical looping steam reforming of coke oven gas.