FUEL 158 |
| Thermochemical cycles are used to split water through a series of chemical reactions where the net result is the production of hydrogen and oxygen at much lower temperatures than direct thermal decomposition. The sulfur-based family of thermochemical cycles appears promising for producing hydrogen from water. These cycles employ a high-temperature sulfuric acid decomposition reaction step that takes place from 750 to 900°C, or higher, and is facilitated by heterogeneous catalysts. The high-temperature harsh chemical reaction conditions present a significantly challenging environment for catalytic materials. Current studies performed at the Idaho National Laboratory have found that the most active catalysts for the reaction, platinum supported on porous metal oxides, are not stable. In this work, we explore the activity of complex metal oxide catalysts, spinels and perovskites, for the decomposition of sulfuric acid. In general, these oxide catalysts have lower activity than platinum catalysts, but appear to have better high-temperature stability. |
|
Advances in Hydrogen Production
1:30 PM-5:05 PM, Tuesday, 12 September 2006 Palace -- Marina Room, Oral
Division of Fuel Chemistry |