Ceramic oxygen membranes operating in the temperature range 600 – 1000ºC will play an important role in future in several industrial fields if different technological issues are solved: (1) thermo-chemical stability in CO₂ and low oxygen environments, (2) permeability of the material surpassing values of 5 ml/min at moderate temperatures and (3) reliable (mass-scale) manufacturing of thin-films on inexpensive and durable porous supports. In this work it is shown the application of perovskite-based oxygen conducting membranes to oxygen separation and to the catalytic conversion of hydrocarbons into added-value chemicals as olefins. The LnSFC and BaSFC membrane sides were catalytically activated using different oxidic and metallic coatings aiming to improve both (1) oxygen exchange rate and (2) selectivity towards the conversion of hydrocarbons into olefins and syngas. The hydrocarbons studied were methane and ethane whereas the main reaction products were ethylene and syngas. The operating conditions of the catalytic membrane reactor (temperature, gas flows and feed composition) were studied on thick and thin-supported membranes to maximize the catalytic selectivity and productivity. Catalytic stability was assessed for one week under operation with hydrocarbons. The membrane assemblies were postmortem characterised by XRD, SEM while the starting components were studied by XRD, Raman, TPO-TPD.

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1. Ceramic Hydrogen-Permeable Membranes made of Mixed Proton-Electronic Conducting Materials based on the system Ln₆WO₁₂