Catalogus : Recensies
Recensies
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Anja Wick Untersuchungen zur Desaktivierung und Regeneration von Katalysatoren zur Wasserstofferzeugung für Brennstoffzellensysteme ISBN: 978-3-8322-8188-5 Prijs: 48,80 € / 97,60 SFR |
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| A new natural gas fuelled 2kWe PEM domestic power supply system for a single-family dwelling was investigated. The work described in the publication comprised the characterisation, operating characteristics and long-term Performance of the catalysts for gas generation and purification. Purification is achieved by low-temperature conversion (single shift) followed by methanation in order to reduce the CO concentration to less than 30 ppm prior to entering the fuel cell. The service life should be similar to conventional heating technologies. The experimental and theoretical investigations of the catalyst stages suggest that both the steam reformer for gas generation and the single shift meet the requirements of the domestic power supply system. The methanation investigations suggested an activity decrease of the catalyst which resulted in higher CO concentrations that may damage the PEM fuel cell. The activity decrease may be explained in terms of carbon accumulation at the active catalyst cells which blocks their activity. In oxidation experiments, the adsorbed carbon could be removed completely from the catalyst surface below reaction temperature. In consequence, methanation can be used as the final gas purification stage if a regeneration phase is integrated in the process. Using a one-dimensional process model, the experimental results were modelled reliably both for the individual catalyst stages and for the overall system. Optimisation studies in the field of gas purification showed that the resulting CO concentration can be reduced even further by appropriate reaction control; this will also simplify the process and make the system more robust. | |
| Bron: ETDE - Energy Database des Leibniz-Instituts für Informationsinfrastruktur (FIZ Karlsruhe), production no.: DE10GC094 | |
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