Cobalt-free dual-phase oxygen transporting membrane reactor for the oxidative dehydrogenation of ethane.

Highlights • ODHE was studied in a cobalt-free dual-phase OTM reactor. • Ethylene selectivity in membrane mode was enhanced compared to co-feed mode. • High ethylene yield over 60% was obtained at 725 °C. • CGO-BFMC shows good chemical stability and catalytic performance for ODHE. Abstract In this work, the oxidative dehydrogenation of ethane (ODHE) was investigated in a cobalt-free dual-phase membrane Ce 0.9 Gd 0.1 O 2-δ - BaFe 0.9 Mg 0.05 Ce 0.05 O 3-δ (CGO-BFMC) with good chemical stability and catalytic performance. Two operation modes were taken to compare the catalytic performance of CGO-BFMC membrane for ODHE. Compared to the co-feed mode with gaseous oxygen, the selectivity and yield of ethylene in membrane mode were significantly enhanced by 18% and 15%, respectively, which probably benefits from the continuous supply of selective oxygen species via oxygen transporting membrane. An ethylene yield of 63% was obtained at 725 °C, which was steadily operated in lab for over 200 h. No obvious decline in selectivity and yield of ethylene was observed, and the spent membrane was still dense after 200 h of operation. [ABSTRACT FROM AUTHOR]