dc.contributor.author | Iglesias Vázquez, Sergio | |
dc.contributor.author | Valecillos Díaz, José del Rosario | |
dc.contributor.author | Remiro Eguskiza, Aingeru | |
dc.contributor.author | Valle Pascual, Beatriz | |
dc.contributor.author | Bilbao Elorriaga, Javier | |
dc.contributor.author | Gayubo Cazorla, Ana Guadalupe | |
dc.date.accessioned | 2024-05-16T14:13:09Z | |
dc.date.available | 2024-05-16T14:13:09Z | |
dc.date.issued | 2024-04 | |
dc.identifier.citation | Energy & Fuels 38(8) : 7033-7048 (2024) | es_ES |
dc.identifier.issn | 0887-0624 | |
dc.identifier.issn | 1520-5029 | |
dc.identifier.uri | http://hdl.handle.net/10810/67995 | |
dc.description.abstract | Ethanol steam reforming (ESR) over a Ni/Al2O3 catalyst prepared by reduction of a NiAl2O4 spinel is a promising alternative route to produce H2 from biomass. This work deepens into the effect of reaction conditions (450–650 °C, a steam/ethanol (S/E) ratio of 3–9, and a weight space time up to 1.3 h) and evaluates the time on stream evolution of the yields of H2, gaseous byproducts (CO, CO2, CH4, C2H4, C2H4O), and formed carbon/coke. The results are explained taking into consideration the thermodynamics, the extent of each individual reaction, and the catalyst deactivation. Up to 600 °C, the predominant intermediate in the H2 formation is C2H4 (formed by ethanol dehydration) with the preferential formation of nanostructured carbon (nanotubes/filaments) by C2H4 decomposition. The deposition of this type of carbon partially deactivates the catalyst, mainly affecting the extent of the C2H4 decomposition causing a sharp decrease in the H2 and carbon yields. Nevertheless, the catalyst reaches a pseudosteady state with an apparent constant activity for other reactions in the kinetic scheme. At 650 °C, C2H4O (formed by the ethanol dehydrogenation) is the main intermediate in the H2 formation, which is the precursor of an amorphous/turbostratic carbon (coke) formation that initially causes a rapid deactivation of the catalyst, affecting the ethanol dehydration and, to a lower extent, the reforming and water gas shift reactions. The increase in the S/E ratio favors the H2 formation, attenuates the catalyst deactivation due to the suppression of the ethanol dehydration to C2H4, and promotes the reforming, water gas shift, and carbon/coke gasification reactions. A H2 yield of 85% stable for 48 h on stream is achieved at 600 °C, with a space time of 0.1 h and an S/E ratio of 9. | es_ES |
dc.description.sponsorship | This research was funded by the Ministry of Science and Innovation of the Spanish Government (grant PID2021-127005OB-I00 and Ph.D. grant BES-2019-090943 for S.I.-V. funded by MCIN/AEI/10.13039/501100011033 and by “ERDF A way of making Europe”); the European Commission (HORIZON H2020-MSCA RISE 2018. Contract No. 823745); and the Department of Education, Universities and Investigation of the Basque Government, grant number IT1645-22. The authors thank for technical and human support provided by SGIker (UPV/EHU/ERDF, EU). | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | ACS | es_ES |
dc.relation | info:eu-repo/grantAgreement/EC/H2020/823745 | es_ES |
dc.relation | info:eu-repo/grantAgreement/MICINN/PID2021-127005OB-I00 | es_ES |
dc.relation | info:eu-repo/grantAgreement/MICINN/BES-2019-090943 | es_ES |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es/ | * |
dc.title | Global Vision of the Reaction and Deactivation Routes in the Ethanol Steam Reforming on a Catalyst Derived from a Ni–Al Spinel | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.rights.holder | © 2024 The Authors. Published by American Chemical Society. This publication is licensed under
CC-BY 4.0. | es_ES |
dc.rights.holder | Atribución 3.0 España | * |
dc.relation.publisherversion | https://pubs.acs.org/doi/10.1021/acs.energyfuels.4c00646 | es_ES |
dc.identifier.doi | 10.1021/acs.energyfuels.4c00646 | |
dc.contributor.funder | European Commission | |
dc.departamentoes | Ingeniería química | es_ES |
dc.departamentoeu | Ingeniaritza kimikoa | es_ES |