Electrochemical Conversion of Methane to Ethylene Utilizing Highly Durable Barium Niobate Perovskites

• DOI: 10.1149/ma2022-01361547mtgabs
• Publication Date: 2022-07-14T17:01:19Z
• Authors: Kannan Ramaiyan; Luke H Denoyer; Angelica Benavidez; Kyle Troche; Fernando H. Garzon
• Keywords: Linear sweep voltammetry

Efficient conversion of methane to value added products such as olefins and aromatics has been in pursuit for the past several decades. The demand increased further due recent discoveries shale gas reserves. Electrochemical is gaining attention its ability control oxide ion flux that will help reduce over-oxidation while also activate via applied potential. High temperature electrolysis benefits this process improved kinetics. Unfortunately, high operation leads materials degradation sintering, crystal structure disproportion thermodynamically more stable phases, interfacial reactions reduces performance. For example, lifetime requirements energy technologies often times exceed 10 years usage with no than 20% degradation.[1] Similarly, we demonstrated chemical instability Sr 2 Fe 1.5 Mo 0.5 O 6- d (SFMO) perovskite was reported show good activation properties.[2] [3] SFMO formed carbonates coke upon exposure CH 4 . Hence, durability measurement results are not these catalysts under extremely reducing or oxidizing environments. We have developed an exciting class barium niobate varying levels Mg/Ca co-doping catalytic activity towards electrochemical conventional heterogeneous oxidative coupling environment.[4] These demonstrate durable activities over five days continuous operation. performed thermogravimetric, FT-IR linear sweep voltammetry methods rapidly determine their stability operationally relevant conditions compared calculations. Stability determinations our electrocatalysts EC-OCM offer excellent example approach evaluation challenging conditions. could serve a support wide variety catalyst applications thus opening up new possibilities. References [1] A. Hauch, S. D. Ebbesen, H. Jensen, M. Mogensen, “Highly efficient electrolysis,” J. Mater. Chem. , vol. 18, no. 20, pp. 2331–2340, 2008, doi: 10.1039/B718822F. [2] K. P. Ramaiyan, L. Denoyer, Benavidez, F. Garzon, “Selective mediated by Sr2Fe1.5Mo0.5O6-δ stability,” Commun. 4, 1, p. 139, 2021, 10.1038/s42004-021-00568-1. C. Zhu, Hou, X. Hu, Lu, Chen, Xie, “Electrochemical ethylene solid electrolyzer,” Nat. 10, 1173, 2019, 10.1038/s41467-019-09083-3. [4] G. Kannan Luke Angelica Stable Doped Barium Niobate Based Electrocatalysts Effective Coupling Methane Ethylene,” ACS Catal. Under Rivsion