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Title

Influence of carburization time on the activity of Mo2C/CNF catalysts for the HDO of guaiacol

AuthorsOchoa, Elba; Torres Gamarra, Daniel; Pinilla Ibarz, José Luis ; Suelves Laiglesia, Isabel
KeywordsHydrodeoxygenation of guaiacol
Molybdenum carbide catalyst
Carbon nanofibers
Carbothermal reduction
Gasification
Issue Date14-Mar-2019
PublisherElsevier
CitationCatalysis Today : (2019)
AbstractCarbon 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.
Description6 Figuras.- 3 Tablas. - Documentación suplementaria disponible en línea en la página web del editor.
Publisher version (URL)http://dx.doi.org/10.1016/j.cattod.2019.03.030
URIhttp://hdl.handle.net/10261/180912
DOI10.1016/j.cattod.2019.03.030
ISSN0920-5861
Appears in Collections:(ICB) Artículos
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