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pubblicazioni - Presentazione

Dense membranes for efficient oxygen and hydrogen separation (DEMOYS): project overview

pubblicazioni - Presentazione

Dense membranes for efficient oxygen and hydrogen separation (DEMOYS): project overview

In questa presentazione vengono illustri obiettivi, struttura e i risultati del progetto DEMOYS finalizzato allo sviluppo di membrane per la separazione dell’ossigeno e dell’idrogeno basate su ossidi conduttori misti, preparate mediante in processo di deposizione di plasma spray a bassa pressione (PS-TF).

This lecture provides an overview of objectives, structure and main results of the DEMOYS project, financially supported by the European Commission in the frame of the 7th FP – Energy. The project started on May 1, 2010 and brings together fourteen Partners, including three Universities, five Research Organizations and six Industries. The objective of DEMOYS is the development of thin mixed conducting membranes for O2 and H2 separation by using a new deposition technique “Plasma Spraying – Thin Film” (PS-TF) in combination with nano-porous, catalytic layers. PS-TF is a proprietary technology developed by Sulzer, which stands between the conventional thin film technologies, such as Physical Vapor Deposition (PVD) and Chemical Vapor Deposition (CVD), and the conventional thermal spray technologies (see Fig. 1). PS-TF (also LPPS-TF) operates at a low pressure (around 1-2 mbar), thus allowing the fast deposition (faster than in the common PVD or CVD spraying techniques) of large areas (up to 1 m). In DEMOYS both ceramic and metallic substrates are used for deposition. it is expected that, by using the PS-TF process, a dense, stable deposit with thickness below 30 μm can be obtained. This would allow increasing membrane performances while decreasing their manufacturing costs. Catalytic layers are also applied to enhance the surface reactions becoming rate limiting for thin membranes. Membrane performances are assessed in pilot loops in order to meet specific targets in terms of permeability and stability at temperature. A modeling study concerning the integration of the developed membranes in power and hydrogen production plants is also performed. This provides inputs for process scale-up and cost evaluation in the selected plant configurations in order to approach zero CO2 emission and lower CO2 capture cost.

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