Hydrogen and Ethylene Production through Water-Splitting and Ethane Dehydrogenation Using BaFe0.9Zr0.1O3-delta Mixed-Conductors

In this work, we investigated the application of ion transport membranes (ITM) in the co-production of hydrogen (H-2) and ethylene (C2H4) through water (H2O) splitting and ethane (C2H6) oxidative dehydrogenation, respectively, using BaFe0.9Zr0.1O3-delta (BFZ) mixed ionic-electronic conducting (MIEC) materials. Experimental measurements showed that a 1.1mm thick BFZ membrane exhibited an oxygen flux (J(O2)) of approximate to 2.0 mu mole/cm(2)/sec when operating at T=900 degrees C with inlet steam mole fraction at the feed side equal to X-H2O =50% and inlet ethane mole fraction at the fuel side equal to X-C2H6=10%. Under the same conditions, ethane conversion and selectivity to ethylene were 95% and 83%, respectively. Lowering the temperature to T=850 degrees C decreased J(O2) to approximate to 1.0 mu mole/cm(2)/sec and conversion of ethane to 79%, but the selectivity to ethylene increased to 93%. The proposed technology shows significant performance advantages compared to traditional ethane cracking and hence is a promising method for chemical conversion processes.