Impact of Geometric and Electronic Factors on Selective Hydrodeoxygenation of Guaiacol by Surface-Rich Metal/Silica Catalysts

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Abstract

The selective production of hydrocarbons for the chemical industry from biogenic feedstock is a significant challenge when ensuring hydrocarbon and fuel supply, despite the heterogeneity of this feed. In this study, guaiacol, as a surrogate for complex lignin-based biomass resources, is converted by an inert silica carrier material with different d-metal impregnation (Mo, W, Re, Fe, Co, Ni, Cu, Pd, Ag) to reveal the reasons for different product selectivity to hydrogenated and deoxygenated hydrocarbon products. Hydrogen at 15 bar (gauge) and guaiacol are converted on metal/silica catalysts between 250 °C and 400 °C, while the physicochemical catalyst properties are characterized before and after catalytic tests. Volcano plots for the conversion, hydrogenation and deoxygenation products versus the d-band energy, surface atom distance and fouling properties reveal three groups of metals: (i) those that are less active and show high coking (Ag, α-Fe); (ii) those that show high activity for hydrogenation (β-Co, Ni, Pd) and, therefore, preferably yielded cyclohexane, cyclohexanol and 2-methoxycyclohexanol; (iii) those that preferably promote deoxygenation (Mo, W, Re, Cu) and, therefore, promoted the formation of phenol, benzene, anisole and catechol. The results are summarized in a pseudo van Krevelen diagram and interpreted as a complex interdependency from Sabatier’s principle of geometric correspondence of hexagonal metal surface for hydrogenation, electronic correspondence for the activation of hydrogen and electronic correspondence by oxophilicity for deoxygenation from the d-band center model.

Details

Original languageEnglish
Article number425
Number of pages31
JournalCatalysts
Volume13
Issue number2
Publication statusPublished - 16 Feb 2023
Peer-reviewedYes

External IDs

ORCID /0000-0002-8928-8340/work/142235834
Scopus 85148756163

Keywords

Research priority areas of TU Dresden

DFG Classification of Subject Areas according to Review Boards

ASJC Scopus subject areas

Keywords

  • hydrodeoxygenation, guaiacol, sabatier’s principle, geometric correspondence, oxophilicity, volcano plot, pseudo van Krevelen diagram