COPROX Fixed Bed Reactor - Temperature Control Schemes

Different temperature control schemes for the COPROX stage of a 5‐kW fuel cell system were analyzed. It was found that, among the schemes proposed, i.e., co‐ and countercurrent heat exchange, single adiabatic reactor and series of adiabatic reactors with interstage heat exchange, the best choice for...

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Bibliographic Details
Published in:	Chemical engineering & technology Vol. 35; no. 6; pp. 1055 - 1063
Main Authors:	Giunta, P., Moreno, M., Mariño, F., Amadeo, N., Lobarde, M.
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Weinheim WILEY-VCH Verlag 01-06-2012 WILEY‐VCH Verlag Wiley-VCH
Subjects:	Applied sciences Chemical engineering Chemical reactors CO preferential oxidation Energy Energy. Thermal use of fuels Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc Exact sciences and technology Fuel cells Heat transfer Reactor design Reactor modeling Reactors Fixed bed reactor Adiabatic Oxidation Steam reforming Temperature control Countercurrent flow Fuel cell
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Summary:	Different temperature control schemes for the COPROX stage of a 5‐kW fuel cell system were analyzed. It was found that, among the schemes proposed, i.e., co‐ and countercurrent heat exchange, single adiabatic reactor and series of adiabatic reactors with interstage heat exchange, the best choice for temperature control was the series of adiabatic reactors with interstage heat exchange. This scheme represented the best way to keep the average temperature around 443 K, which was found to be the most suitable temperature for selectivity towards CO oxidation. If hydrogen is produced from ethanol steam reforming, the heat withdrawal can be carried out by the water/ethanol reformer feed mixture, thus contributing to the energy integration of the overall system. Preferential oxidation of CO with a Cu/CeO2 catalyst was employed to reduce the CO content to less than 20 ppm in a hydrogen stream obtained from hydrocarbons or alcohols. Temperature control is a key issue to achieve high CO conversion and simultaneously to avoid the oxidation of hydrogen. Heat transfer alternatives in a fixed bed reactor are analyzed and discussed.
Bibliography:	ANPCYT istex:87FCD7901B6C954F89ABB70C5EC0B12292A110C6 ark:/67375/WNG-DZ19H1RB-K University of Buenos Aires ArticleID:CEAT201100644 CONICET
ISSN:	0930-7516 1521-4125
DOI:	10.1002/ceat.201100644