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Artículo

A million-channel reformer on a fingertip: Moving down the scale in hydrogen production

Lopez, EduardoIcon ; Irigoyen, Aitor; Trifonov, Trifon; Rodríguez, Angel; Llorca, Jordi
Fecha de publicación: 01/2010
Editorial: Pergamon-Elsevier Science Ltd
Revista: International Journal of Hydrogen Energy
ISSN: 0360-3199
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ingeniería Química

Resumen

The present contribution reports the design, manufacture and experimental proof of concept of an ethanol micro-reformer for portable-fuel cell feeding. Through photo-assisted electrochemical etching, a silicon micromonolithic substrate with perfectly parallel cylindrical channels of 3.3 μm diameter was achieved (density of channels of ca. 4 × 104 channels mm-2). The channel walls were coated with a cobalt-based catalyst. The resultant functionalized micromonoliths were implemented in a stainless steel microreactor including feed evaporation facilities and electrical heating. The unit was successfully tested for ethanol steam reforming under non-diluted feed conditions at 773 K, achieving high hydrogen specific production rates, high ethanol conversions (>80%) and adequate selectivity profiles, with H2:CO2 molar ratios of ∼3 and low CO outlet concentrations. A performance comparison was performed with two other reforming substrates with the same catalyst formulation, namely, a conventional cordierite monolith and a conventional stainless steel microreactor. Results show for the Si-micromonolithic reactor a remarkable improvement of the specific hydrogen production rate (per unit reactor volume and feed flowrate), operating at considerably reduced residence times, due to the increase in contact area per unit volume. © 2010 Professor T. Nejat Veziroglu.
Palabras clave: Ethanol Reforming , Hydrogen , Macroporous Silicon , Microreactor
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/57681
DOI: https://dx.doi.org/10.1016/j.ijhydene.2010.01.146
URL: https://www.sciencedirect.com/science/article/pii/S036031991000248X
Colecciones
Articulos(PLAPIQUI)
Articulos de PLANTA PILOTO DE INGENIERIA QUIMICA (I)
Citación
Lopez, Eduardo; Irigoyen, Aitor; Trifonov, Trifon; Rodríguez, Angel; Llorca, Jordi; A million-channel reformer on a fingertip: Moving down the scale in hydrogen production; Pergamon-Elsevier Science Ltd; International Journal of Hydrogen Energy; 35; 8; 1-2010; 3472-3479
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