English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/191459
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


Investigation of the reduction kinetics of high loaded CuO-based materials suitable for the Ca/Cu looping process

AuthorsDíez-Martín, Laura; Martínez Berges, Isabel; Grasa Adiego, Gemma ; Murillo Villuendas, Ramón
KeywordsCa/Cu looping process
CuO-based materials
Reduction kinetics
Shrinking core model
Issue Date25-May-2018
CitationFuel 230: 376-389 (2018)
AbstractIn this work, the reduction reactions of highly loaded CuO-based materials with H2, CO and CH4, have been investigated. The oxygen transport capacity of the materials was barely affected (i.e. losses around 5%) along 100 reduction/oxidation cycles at 1123 K tested in TGA. The experimental results suggested that a shrinking core model (SCM) with chemical reaction control is able to predict the reduction conversion of highly loaded CuO-based materials in powder and pellet form, and the kinetic parameters were accordingly determined to this model. The activation energy values obtained for the materials supported over Al2O3 and MgAl2O4 are in the range of 10 kJ mol−1 for H2, 25 kJ mol−1 for CO and 60 kJ mol−1 for CH4, in agreement with results published in the literature, indicating that using Al2O3 or MgAl2O4 as support has not a significant effect on the reactivity. It has been found that internal diffusion plays a role for the highly loaded CuO-based in pellet form when supported over MgAl2O4 and when using CO and CH4 as reducing agents. Mixtures of reducing gases have been also tested in the TGA for a pellet using Al2O3 as support and the experimental results have been successfully fitted using the kinetic parameters previously determined. Finally, a simplified energy balance for the reactions involved in the reduction/calcination stage of the Ca/Cu process has been performed to determine operational conditions in which the reaction fronts for both reactions proceed together in the reactor. The results indicate that the materials tested present suitable reaction kinetics to sustain the reduction/calcination stage.
Description12 Figuras.- 3 Tablas
Publisher version (URL)http://dx.doi.org/10.1016/j.fuel.2018.05.054
Appears in Collections:(ICB) Artículos
Files in This Item:
File Description SizeFormat 
JFUE-D-17-04686R1.pdf Embargoed until May 25, 2020Artículo principal1,72 MBAdobe PDFThumbnail
View/Open    Request a copy
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.