Experimental Studies on the FeO/Fe sub(3)O sub(4) Cycle Complemented with Carbon Gasification for Producing Hydrogen

A modified FeO/Fe sub(3)O sub(4) redox cycle of producing hydrogen from water at a constant temperature of 800 degree C is experimentally studied. Instead of solar energy, Fe sub(3)O sub(4) was reduced to FeO by CO, the product of carbon gasification. The carbon was from coal carbonization. It was s...

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Bibliographic Details
Published in:Energy & fuels 2013-07, Vol.27 (7), p.4071-4076-4071-4076
Main Authors: Zhou, Yaping, Sun, Yan, Su, Wei, Zhou, Li
Format: Article
Language:English
Subjects:
Carbon
Carbon monoxide
Coal
Constants
Gasification
Reactors
Reduction
Residual gas
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Summary:A modified FeO/Fe sub(3)O sub(4) redox cycle of producing hydrogen from water at a constant temperature of 800 degree C is experimentally studied. Instead of solar energy, Fe sub(3)O sub(4) was reduced to FeO by CO, the product of carbon gasification. The carbon was from coal carbonization. It was shown that the rate of both oxidation (reaction of FeO with H sub(2)O) and reduction (reaction of Fe sub(3)O sub(4) with CO) was fast; however, the reduction must stop before formation of metal iron. The addition of 5-10 mol % Mo in iron oxide improved the stability and the reactivity of the latter during reaction cycling. Hydrogen was produced continuously in a process consisting of three reactors that couple the FeO/Fe sub(3)O sub(4) redox cycle with carbon gasification (at 900 degree C). The residual gas in the reactor and pipeline at the end of reduction may contaminate the hydrogen product; however, an evacuation step complemented to the end of reduction guarantees a hydrogen concentration higher than 95%.
ISSN:0887-0624
1520-5029
DOI:10.1021/ef4004939