FUEL 103 |
| Ammonia-borane (AB) complex is a chemical hydride with very high hydrogen content (19.6 wt%). In this paper, we present a new process for generating hydrogen via hydrolysis of AB, which yields 3 moles of H2 and one mole of NH3. Phosphoric acid was used as a sequestering agent due to its superior performance in removing NH3 and minimum pull down on the system-level gravimetric hydrogen storage density. Hydrogen was generated by reacting an aqueous solution, containing Na3Cl6Rh catalyst and phosphoric acid, at a rate of 0.025 mL/min isothermally at 70 C with AB. Rate of hydrogen evolution tripled when the injection rate was increased to 0.050 mL/min. Hydrogen production rates were essentially unchanged when the hydrogen generator operated adiabatically. When AB complex, in the form of pellets or tablets, were added periodically, one tablet at a time, to the catalytic solution at 80 C, much higher rate of H2 production was observed. |
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Progress in Computational and Experimental Studies of Materials for Hydrogen Storage
1:30 PM-5:10 PM, Monday, 11 September 2006 Palace -- Mendocino Room, Oral
Division of Fuel Chemistry |