A catalytic reaction pair of decalin dehydrogenation / naphthalene hydrogenation has been proposed as a storage medium for fuel cell hydrogen in mobile modes. The hydrogen capacities with decalin (7.3 wt%, 64.8 kg-H2/m3) are higher than the target values of the Department of Energy, USA (6.5 wt%, 62.0 kg-H2/m3). Platinum-rhenium composite catalysts supported on granular activated carbon in 'superheated liquid-film' states gave excellent reactivities for decalin dehydrogenation, where the conversion of almost 100% from decalin to naphthalene was attained within 1 h by heating at 280 deg C in a batch-wise reactor. 'Superheated liquid-film' conditions were realized in a continuous-type reactor as well at the same temperature (280 deg C). In order to maintain rapid evolution of hydrogen stationarily, decalin feed rates were allowable at a rather wide range by using platinum particles supported on activated carbon cloth. Decalin should be evaluated as an organic chemical hydride not only because of its storage densities but also of its potential on power densities for fuel-cell vehicles. Superheated liquid-film conditions at the same heating temperature were realized as well in continuous operations at wider rate ranges of decalin feed than the batch-wise operation. As estimated from the experimental results in the continuous operation, hydrogen supply for 50 kW power was attainable with a catalytic reactor by keeping the level of one-pass conversion above 70% and of reaction area below 1.0 m2.
Hydrogen storage by organic hydrides and hydrogen supply to fuel cells with superheated liquid-film-type catalysis
2004
12 Seiten, 8 Bilder, 1 Tabelle, 18 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Brennstoffzelle , Wasserstoff , katalytische Reaktion , Decahydronaphthalin , Naphthalin , Dehydrierung , Hydrierung , hydrierter Kohlenstoff , Speichern , Wasserstoffspeicherung , reaktive Destillation , Katalysator , Platin , Dauerbetrieb , Fahrzeug , Speicherfähigkeit , Rhenium , Granulatschüttung , Aktivkohle
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