A Study on Mg_nV₂O_5+n Oxygen Carrier for Chemical Looping Oxidative Dehydrogenation of Ethane

This study investigates a series of Mg_nV₂O_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. After cycling, both MV1 and MV2 exhibited the formation of secondary phases (MgV₃O₈ and Mg₂V₆O₁₇, respectively), while MV3 retained its framework. Among the samples, MV2 demonstrated notable catalytic performance, achieving 85% ethylene selectivity and 14.5% ethylene yield. This performance is primarily attributed to the balanced redox characteristics of the Mg₂V₂O₇-based framework, accompanied by structural modification during cycling.