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Finding a suitable catalyst for on-board ethanol reforming using exhaust heat from an internal combustion engine

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10.1016/j.ijhydene.2016.11.197
 
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Casanovas Grau, Albert
Jiménez Divins, NuriaMés informacióMés informacióMés informació
Rejas García, Albert
Bosch Tous, RicardoMés informacióMés informacióMés informació
Llorca Piqué, JordiMés informacióMés informacióMés informació
Document typeArticle
Defense date2017-05-11
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Ethanol steam reforming with pure ethanol and commercial bioethanol (S/C = 3) was carried out inside the housing of the exhaust gas pipe of a gasoline internal combustion engine (ICE) by using exhaust heat (610–620 °C). Various catalytic honeycombs loaded with potassium-promoted cobalt hydrotalcite and with ceria-based rhodium–palladium catalysts were tested under different reactant loads. The hydrogen yield obtained over the cobalt-based catalytic honeycomb at low load (F/W < 25 mLliq·gcat-1·h-1, GHSV = 4·102 h-1) was remarkably high, whereas that obtained over the noble metal-based catalytic honeycombs was much superior at high loads (F/W = 25–150 mLliq·gcat-1·h-1, GHSV = 4·102–2.4·103 h-1). At higher reactant loads the overall hydrogen production was limited by heat transfer from the exhaust heat to the reformer inside the housing of the exhaust gas pipe of the ICE. Extensive carbon deposition occurred over the cobalt-based honeycomb, making its use impractical. In contrast, stability runs (>200 h) at high load (F/W = 150 mLliq·gcat-1·h-1, GHSV = 2.4·103 h-1) showed that promotion of the ceria-supported noble metal catalyst with alumina and zirconia is a key element for practical application using commercial bioethanol. HRTEM analysis of post mortem honeycombs loaded with RhPd/Ce0.5Zr0.5O2–Al2O3 showed no carbon formation and no metal agglomeration.
CitationCasanovas, A., J. Divins, N., Rejas, A., Bosch, R., Llorca, J. Finding a suitable catalyst for on-board ethanol reforming using exhaust heat from an internal combustion engine. "International journal of hydrogen energy", 11 May 2017, vol. 42 no. 19, p. 13681-13690. 
URIhttp://hdl.handle.net/2117/102860
DOI10.1016/j.ijhydene.2016.11.197
ISSN0360-3199
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S0360319916335303
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  • NEMEN - Nanoenginyeria de materials aplicats a l'energia - Articles de revista [244]
  • INTE - Institut de Tècniques Energètiques - Articles de revista [280]
  • InSup - Grup de Recerca en Interacció de Superfícies en Bioenginyeria i Ciència dels Materials - Articles de revista [30]
  • Departament d'Enginyeria Química - Articles de revista [2.117]
  • Departament d'Enginyeria Elèctrica - Articles de revista [817]
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