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Issue 6, 2019
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Synergistic effect of Mo–W carbides on selective hydrodeoxygenation of guaiacol to oxygen-free aromatic hydrocarbons

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Abstract

Mo–W carbide was synthesized via temperature-programmed reduction to generate a β-Mo2C phase with bulk morphology. The catalyst was characterized using X-ray diffraction (XRD), N2 physisorption, X-ray photoelectron spectroscopy (XPS), H2-chemisorption, and ammonia temperature programmed desorption (NH3-TPD) to investigate the synergistic effect of the combination of molybdenum and tungsten in carbide. Due to the interaction of Mo–W, the bimetallic carbide exhibited a significantly higher density of H2-activating sites than the corresponding monometallic carbides prepared using the same method. In the HDO of guaiacol at 350 °C, MoWC exhibited the highest hydrodeoxygenation (HDO) activity and produced completely deoxygenated products with a selectivity of 92 mol% in which the benzene selectivity was ∼70 mol%. The superior catalytic activity is attributed to the presence of H2-activating sites and oxophilic sites. Under the testing conditions, the HDO of guaiacol over monometallic molybdenum carbide followed both direct deoxygenation (DDO) and hydrogenation–dehydration (HYD) pathways, while MoWC strongly favored the DDO route. Over 8 h on stream, the catalyst still retained a high catalytic stability.

Graphical abstract: Synergistic effect of Mo–W carbides on selective hydrodeoxygenation of guaiacol to oxygen-free aromatic hydrocarbons

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Supplementary files

Article information


Submitted
22 Oct 2018
Accepted
07 Feb 2019
First published
12 Feb 2019

Catal. Sci. Technol., 2019,9, 1387-1397
Article type
Paper

Synergistic effect of Mo–W carbides on selective hydrodeoxygenation of guaiacol to oxygen-free aromatic hydrocarbons

C. Tran, Y. Han, M. Garcia-Perez and S. Kaliaguine, Catal. Sci. Technol., 2019, 9, 1387
DOI: 10.1039/C8CY02184H

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