Dehydrogenation Coupling of Methane Using Catalyst-Loaded Proton-Conducting Perovskite Hollow Fiber Membranes

Catalytic dehydrogenation coupling of methane (DCM) represents an effective way to convert natural gas to more useful C₂ products (C₂H₆, C₂H₄). In this work, BaCe_0.85Tb_0.05Co_0.1O_3−δ (BCTCo) perovskite hollow fiber membranes were fabricated by the combined phase inversion and sintering method. SrCe_0.95Yb_0.05O_3−δ (SCYb) perovskite oxide was loaded as a catalyst onto the inner hollow fiber membrane surface, which promoted the CH₄ conversion and the C₂ hydrocarbon selectivity during the DCM reaction. The introduction of steam into the methane feed gas mixture elevated the C₂ selectivity and yield due to the alleviation of coke deposition. Switching N₂ to air as the sweep gas further increased the C₂ selectivity and yield. However, the conversion of methane was limited by both the low permeability of the membrane and the insufficient catalytic activity of the catalyst, leading to low C₂ yield.

Oxidative Coupling of Methane for Ethylene Production: Reviewing Kinetic Modelling Approaches, Thermodynamics and Catalysts

Ethylene production via oxidative coupling of methane (OCM) represents an interesting route for natural gas upscaling, being the focus of intensive research worldwide. Here, OCM developments are analysed in terms of kinetic mechanisms and respective applications in chemical reactor models, discussing current challenges and directions for further developments. Furthermore, some thermodynamic aspects of the OCM reactions are also revised, providing achievable olefins yields in a wide range of operational reaction conditions. Finally, OCM catalysts are reviewed in terms of respective catalytic performances and thermal stability, providing an executive summary for future studies on OCM economic feasibility.