Broader contextAt present, fossil fuels (oil, gas, and coal) represent the largest share of all primary energy sources and will most likely remain dominant over the coming decades. The combustion of fossil fuels produces large amounts of CO2during the energy conversion process. With a share of over 60%, power generation represents the largest source of anthropogenic CO2. Carbon dioxide capture and storage is one option in the portfolio of mitigation methods to stabilize emissions of CO2. Oxy-combustion power plants using membrane technology have been proposed as one possible approach for CO2capture. However, the use of membranes for integrated air separation is very challenging due to several constraints that limit power plant performance and the lifetime of critical process components.