Dupont, V orcid.org/0000-0002-3750-0266, Twigg, MV, Rollinson, AN et al. (1 more author) (2013) Thermodynamics of hydrogen production from urea by steam reforming with and without in situ carbon dioxide sorption. International Journal of Hydrogen Energy, 38 (25). pp. 10260-10269. ISSN 0360-3199
Abstract
The thermodynamic effects of molar steam to carbon ratio (S:C), of pressure, and of having CaO present on the H2 yield and enthalpy balance of urea steam reforming were investigated. At a S:C of 3 the presence of CaO increased the H2 yield from 2.6 mol H2/mol urea feed at 940 K to 2.9 at 890 K, and decreased the enthalpy of bringing the system to equilibrium. A minimum enthalpy of 180.4 kJ was required to produce 1 mol of H2 at 880 K. This decreased to 94.0 kJ at 660 K with CaO-based CO2 sorption and, when including a regeneration step of the CaCO3 at 1170 K, to 173 kJ at 720 K. The presence of CaO allowed widening the range of viable operation at lower temperature and significantly inhibited carbon formation. The feasibility of producing H2 from renewable urea in a low carbon future is discussed.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2013, Elsevier. This is an author produced version of a paper published in the International Journal of Hydrogen Energy. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Urea; Steam reforming; CO2 sorption; Carbon; Thermodynamics; Energy |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 25 Apr 2014 12:20 |
Last Modified: | 15 Jun 2020 05:27 |
Published Version: | http://dx.doi.org/10.1016/j.ijhydene.2013.06.062 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.ijhydene.2013.06.062 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:78681 |