Ammonia Decomposition Over Tantalum Carbides of Hydrogen Fuel Cell
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Tantalum carbide crystallites which is to be used for H2 fuel cell has been synthesized via a temperature-programmed reduction of Ta2O5 with pure CH4. The resultant Ta carbide crystallites prepared using two different heating rates and space velocity exhibit the different surface areas. The O2 uptake has a linear relation with surface area, corresponding to an oxygen capacity of 1.36×1013 O cm-2. Tantalum carbide crystallites are very active for hydrogen production form ammonia decomposition reaction. Tantalum carbides are as much as two orders of magnitude more active than Pt/C catalyst (Engelhard). The highest activity has been observed at a ratio of C1/Taδ+=0.85, suggesting the presence of electron transfer between metals and carbon in metal carbides.
Abstract
Tantalum carbide crystallites which is to be used for H2 fuel cell has been synthesized via a temperature-programmed reduction of Ta2O5 with pure CH4. The resultant Ta carbide crystallites prepared using two different heating rates and space velocity exhibit the different surface areas. The O2 uptake has a linear relation with surface area, corresponding to an oxygen capacity of 1.36×1013 O cm-2. Tantalum carbide crystallites are very active for hydrogen production form ammonia decomposition reaction. Tantalum carbides are as much as two orders of magnitude more active than Pt/C catalyst (Engelhard). The highest activity has been observed at a ratio of C1/Taδ+=0.85, suggesting the presence of electron transfer between metals and carbon in metal carbides.
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