Preparation, characterization and application of a catalytic NaA membrane for CH4/CO2 reforming to syngas Original Research Article

The NaA and La2NiO4/NaA composite membranes were prepared by means of in situ hydrothermal synthesis. The structure, morphology, separation performance, as well as chemical state and surface composition of a La2NiO4/NaA composite membrane were investigated by means of techniques, such as XRD, SEM-EDX, GC, TPD, XPS, and XAES. When the membrane was applied in a membrane reactor for CH4/CO2 reforming, CH4 and CO2 conversions, and CO and H2 selectivities were significantly higher than the values observed over a traditional fixed-bed reactor. We studied the effects of the flow rate of sweeping N2, gas hour space velocity (GHSV), and reaction temperature on the conversions of CH4 and CO2. The carbon deposited on the surface of membrane was studied by means of the TPO–MS technique.