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Título: | Influence of carburization time on the activity of Mo2C/CNF catalysts for the HDO of guaiacol |
Autor: | Ochoa, Elba CSIC; Torres Gamarra, Daniel CSIC ORCID; Pinilla Ibarz, José Luis CSIC ORCID ; Suelves Laiglesia, Isabel CSIC ORCID | Palabras clave: | Hydrodeoxygenation of guaiacol Molybdenum carbide catalyst Carbon nanofibres Carbothermal reduction Gasification |
Fecha de publicación: | 14-mar-2019 | Editor: | Elsevier | Citación: | Catalysis Today 357: 240-247 (2019) | Resumen: | Carbon nanofiber (CNF) supported β-Mo2C-based catalysts were synthetized by carbothermal hydrogen reduction at 750 °C for different times (1, 2, 4, 6 and 18 h) in order to study both the carbide phase formation and the CNF stability during this key stage. Catalysts were characterized by N2 physisorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy, inductively coupled plasma optical emission spectrometry and scanning transmission electron microscopy. Subsequently, catalysts were evaluated in the hydrodeoxygenation (HDO) of guaiacol using a batch autoclave reactor at mild conditions of temperature and pressure (300 °C and 20 bar of H2). Liquid products were analysed after 2 h of reaction by gas chromatography. In all cases, β-Mo2C phase was formed during the carburization, and crystal sizes increased (from 6 to 18 nm as measured by XRD) as the carburization time did. However, a deep gasification of the support was observed in catalysts carburized above 6 h, resulting in a dramatic loss of specific surface area. In the guaiacol HDO reaction, higher conversions (72–80 %) and HDO ratios (53–63 %) were obtained using catalysts carburized for 2 h and onwards. Considering the carbide content in the catalyst, 1 and 2 h carburized catalysts exhibited the highest values of formation of HDO products: phenol, cyclohexane + benzene and anisole. Besides this, a clear relationship between the Mo2C surface area (SMo2C) and the product formation rate could be inferred for the catalysts carburized at 1, 2 and 4 h, in which the textural properties were not affected by the carburization time. On the other hand, longer carburization times had a worse performance despite the largest values of SMo2C, being this fact related to the dramatic loss of the catalyst textural properties. | Descripción: | 6 Figuras, 3 Tablas.-- Documentación suplementaria disponible en línea en la página web del editor.-- © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | Versión del editor: | http://dx.doi.org/10.1016/j.cattod.2019.03.030 | URI: | http://hdl.handle.net/10261/180912 | DOI: | 10.1016/j.cattod.2019.03.030 | ISSN: | 0920-5861 |
Aparece en las colecciones: | (ICB) Artículos |
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Catalysis Today_Ochoa_2019.pdf | Artículo principal | 1,5 MB | Adobe PDF | Visualizar/Abrir |
Catalysis Today_Ochoa_2019_is.pdf | Información suplementaria | 562,85 kB | Adobe PDF | Visualizar/Abrir |
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