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Synergistic Effect of Mo-W Carbides on Selective Hydrodeoxygenation of Guaiacol to Oxygen-Free Aromatic Hydrocarbons

Abstract

Mo-W carbide was synthesized via temperature-programmed reduction to generate 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 (TPD-NH3) to investigate the synergistic effect of a combination of molybdenum and tungsten in carbide. Due to the interfacial 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 350oC, MoWC yielded the highest hydrodeoxygenation (HDO) activity and produced completely deoxygenated products with a selectivity of 92 mol% in which benzene selectivity was ⁓70 mol%. Under the testing conditions, 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 8h on stream, the catalyst still retained a high catalytic stability.

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Publication details

The article was received on 22 Oct 2018, accepted on 07 Feb 2019 and first published on 12 Feb 2019


Article type: Paper
DOI: 10.1039/C8CY02184H
Citation: Catal. Sci. Technol., 2019, Accepted Manuscript

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    Synergistic Effect of Mo-W Carbides on Selective Hydrodeoxygenation of Guaiacol to Oxygen-Free Aromatic Hydrocarbons

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

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