Sulfur-Iodine Thermochemical Rxn . 1. 2H 2 O (l) + SO 2(g ) + I 2(l ) → H 2 SO 4(l ) + 2HI (l ) 120 ° C Bunsen Reaction 2a . H 2 SO 4(l ) → H 2 O (g ) + SO 3(g) ~ 850 °C 2b . SO 3(g) → SO 2(g ) + 0.5O 2(g ) ~500°C
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2b. SO3(g)→ SO2(g) + 0.5O2(g) ~500°C
CO + H2O → CO2 + H2
Doesn’t cut out carbon emission
Needs extremely high temperatures for efficiencies ~45%
CO2 + 3H2→ CH3OH + H20
- dimethyl ether CH3OCH3
- Ammonia NH3
“To produce hydrogen economically, a reactor must operate at extremely high temperatures. Thus the VHTR has been selected for future hydrogen production plants. ‘The VHTR has the highest priority among the U.S. reactor concepts,’ [Bill] Corwin says, ‘because it fits into the President's plan for the hydrogen economy.’”
-”Can the Next Generation Take the Heat?” ORNL Review. http://www.ornl.gov/info/ornlreview/v37_1_04/article_02.shtml. 30 Nov 2010.
Involved fuel handling process
(At ambient pressure) Na boiling point – 883°C
Full cycle has not been perfected