The aim of the MEM-BRAIN project is the development and integration of gas separation membranes for zero-emission fossil power plants. This should be achieved by selective membranes with high permeability for CO₂, O₂ or H₂, so that CO₂ is reached with high purity in a readily condensable form.

The technical basis is provided by two Research Topics of the Alliance in the field of materials science, one developing ceramic membranes (RT 1), the other polymeric membranes (RT 2). Main scientific challenge is the development of membrane systems with high permeability, specific selectivity and long-term stability. In application these systems have to be included into power plants and an energy system which define additional boundary conditions.

Ceramic membranes operating at intermediate temperatures (≤ 400°C) are developed for H₂/CO₂ separation (pre-combustion process). These include microporous molecular sieving membranes, especially zeolite and sol-gel derived membranes. Dense ceramic mixed proton/electron conducting membranes are developed for operating temperatures above 800°C.

For O₂/N₂ separation (oxyfuel process and hydrogen production for pre-combustion process), dense ceramic mixed oxygen ion-electron conducting membranes are developed for working conditions at 800-1000°C. A demonstration-unit (Proof-of-concept) for testing O₂/N₂ separation membranes is designed and built up. The reference material is Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF).

Polymeric and organic/inorganic hybrid membranes are produced for the CO₂/N₂ separation (post-combustion process) at temperature ranges up to 200°C. Beside pure polymeric membranes new hybrid organic/inorganic membranes with inorganic molecular sieves will be prepared.

In RT 3 all power plant processes are modelled and their potential of using membranes for CO₂ capture are analysed.

RT 4 is performing an assessment of specific technical, economic and environmental aspects of CO₂ capture as a component of the whole CCS process chain.

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1. Permeation Studies and Chemical Stability of MIEC Membranes for highly efficient Air Separation in Oxyfuel Power Plant Processes
2. Ceramic Hydrogen-Permeable Membranes made of Mixed Proton-Electronic Conducting Materials based on the system Ln₆WO₁₂
3. Characterisation and performance of novel TiO₂-ZrO₂ membranes for gas separation
4. Materials and processing for high performance solid oxide fuel cells with long-term durability
5. Oxygen permeation through asymmetric perovskitic membranes