A Study on MgnV2O5+n Oxygen carrier for Chemical Looping Oxidative Dehydrogenation of Ethane

This study investigates a series of Mg _n V ₂ O _5+n (n = 1, 2, 3) oxygen carriers referred to as MV1, MV2, and MV3 for chemical looping oxidative dehydrogenation (CL-ODH). The materials were synthesized via a sol-gel method, and their structural, redox, and catalytic properties were evaluated over 10 cycles. MV1 transformed into MgV ₃ O ₈ , MV2 into Mg ₂ V ₆ O ₁₇ , while MV3 retained its framework. All samples showed decreased lattice oxygen mobility after 10 cycles, especially in MV2, which also exhibited significant changes in surface basicity due to the formation of the Mg ₂ V ₆ O ₁₇ phase. Among the samples, MV2 demonstrated the notable catalytic performance, achieving 85% ethylene selectivity and 14.5% ethylene yield. This performance is attributed to the formation of the Mg ₂ V ₆ O ₁₇ layer, which regulate lattice oxygen mobility and suppress over-oxidation. MV2 maintained stable performance over 20 cycles.