Hydrogen from Coal in a Single Step
| Autor: | Tomasz Wiltowski, Kanchan Mondal, Debalina Dasgupta, Edwin J. Hippo, Krzystof Piotrowski |
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| Rok vydání: | 2005 |
| Předmět: |
Exothermic reaction
Hydrogen Chemistry business.industry General Chemical Engineering chemistry.chemical_element Water gas General Chemistry complex mixtures Industrial and Manufacturing Engineering Water-gas shift reaction chemistry.chemical_compound Chemical engineering Coal gasification Coal business Carbon monoxide Hydrogen production |
| Zdroj: | Industrial & Engineering Chemistry Research. 44:5508-5517 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie048974d |
| Popis: | The production of high-purity hydrogen via steam gasification of coal has been investigated. The separation of CO from H2 in the gasification products is achieved by CO oxidation to CO2 followed by uptake of the CO2 by a suitable removal agent. This uptake of CO2 increases the extent of the water gas shift reaction and enhances the yield and purity of H2. In addition to the water gas shift reaction, the oxidation is enhanced by the use of a solid oxygen transfer agent (Fe2O3) in the hydrogen enrichment pass. Subsequently, the reduced oxygen transfer agent is reoxidized (and thus regenerated) in the presence of air and the heat liberated via the exothermic reaction is utilized to regenerate carbon dioxide removal agent. In this study, the effect of process variables on coal gasification and hydrogen enrichment has been evaluated. Fixed bed gasification studies using coal and coal−Fe2O3 and coal−CaO mixtures were conducted to evaluate the kinetics of gasification and separation effectiveness of the process.... |
| Databáze: | OpenAIRE |
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