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Role of tungsten modifiers in bimetallic catalysts for enhanced hydrodeoxygenation activity and selectivity

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Abstract

Bimetallic catalysts consisting of a noble metal and an oxophilic modifier have shown promise for upgrading lignin-derived molecules through hydrodeoxygenation (HDO). However, the mechanism of cooperation between the metals is not well understood currently. In this study, we investigated the HDO of gas-phase benzyl alcohol on W-modified Pt/Al2O3 catalysts. Our results show that bimetallic catalysts with an intermediate W loading have enhanced activity and selectivity for HDO compared to a baseline, monometallic Pt/Al2O3 catalyst. Characterization of the active site through CO chemisorption and CO diffuse-reflectance infrared spectroscopy suggests that decarbonylation is suppressed on bimetallic catalysts through site blocking and electronic effects. Based on results from X-ray photoelectron spectroscopy and titration with bases, enhancements in HDO activity were attributed to new active sites in the form of Brønsted acid centers on partially reduced WOx generated through a bifunctional H2 spillover interaction with Pt.

Graphical abstract: Role of tungsten modifiers in bimetallic catalysts for enhanced hydrodeoxygenation activity and selectivity

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Supplementary files

Article information


Submitted
05 Nov 2019
Accepted
08 Dec 2019
First published
09 Dec 2019

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Role of tungsten modifiers in bimetallic catalysts for enhanced hydrodeoxygenation activity and selectivity

M. J. Rasmussen and J. W. Medlin, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/C9CY02240F

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