How to reduce the temperature requirement of reverse deacon process?
Dear Farrukh Khalid,
The reverse Deacon reaction, Cl2 + H2O → 2HCl + 12 O2, is considered one of the most important steps in thermo chemical water-splitting processes for production of hydrogen from water. The purpose for undertaking this research was to investigate the kinetics of the chlorination of water vapor at high temperatures. The reverse Deacon reaction is shown to require very high temperatures (1100K or higher) or a catalyst to obtain satisfactory reaction rates. The rate expression was verified by the integral approach and the results were extended to two other temperatures, 777 K and 983 K. If a high temperature is used, the reverse reaction is likely to occur as the products are cooled. The reverse reaction could be minimized by very rapid cooling but this would incur irreversible heat losses in addition to the heat required to drive the reaction. The work of separation and recycle is also very large for this reaction. A statistical study was also made to reveal the effects of the flow rates of the reactants and temperature on conversion of chlorine. Preliminary experimental work on the chlorination of magnesia and the hydrolysis of magnesium chloride indicates that both these reactions must be run as solid gas reactions. In addition, they must be run in such a way that diffusional limitations to the reaction rate are avoided.
Regards,
Prem Baboo
Conference Paper Thermochemical water splitting: the reverse Deacon reaction ...
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