Dual-phase Ce_0.8Sm_0.2O_2--La_0.8C a_0.2Al_0.3Fe_0.7O_3- oxygen permeation hollow fiber membrane for oxy-CO₂ reforming of methane

With the growing energy demand and depletion of fossil fuels, methane (CH4) conversion technologies have garnered attention to produce derivative fuels and chemicals. We propose a dual-phase and cobalt-free hollow fiber membrane (HFM) composed of Ce0.8Sm0.2O2-delta (SDC) and La0.8Ca0.2Al0.3Fe0.7O3-delta (LCAF) for oxy-CO2 reforming of methane (OCRM) with production of syngas and pure N-2. At 850 degrees C, the SDC-LCAF HFM demonstrated an oxygen permeation flow rate of 2.01 mL min(-1) with 10 mL min(-1) air feed and 10-10-20 mL min(-1) CH4-CO2-He permeate inlet flow rates. The SDC-LCAF membrane demonstrated excellent thermochemical stability and CO2 resistance. When integrated with a 10 wt% Ni/SDC-LCAF catalyst, the OCRM performance of the resultant membrane reactor was achieved with high CH4 and CO2 conversions, and CO and H-2 selectivity of approximately 99.83%, 78.40%, 93.24%, and 83.76%, respectively. The reactor exhibited stable performance for 50 h, making it a promising solution for sustainable syngas and N-2 production.