Hydrodeoxygenation of biomass-derived lignin monomer guaiacol over bifunctional catalysts

Hydrodeoxygenation of biomass-derived lignin monomer guaiacol over bifunctional catalysts
biomass; biofuel; lignin; catalyst
Issue Date
15th International Congress on Catalysis
Catalytic hydrodeoxygenation (HDO) of a lignin monomer was studied to elucidate the roles of catalyst components and improve the HDO activity, which will chemically convert lignin, composed of complex polymerized phenolic monomers [1], to the fuels and chemicals replacing fossil fuels. HDO is one of the possible chemical processes to the valuable products from lignin, and we performed the HDO of guaiacol (2-methoxyphenol), one of lignin’s model compounds, because it exhibits the representative structure of lignin monomers being abundant in a biomass pyrolysis oil. In order to elucidate the roles of metal nanoparticles and acid matrices, we observed the HDO reactions of bifunctional catalysts of noble-metal nanoparticles, such as Rh, Pt, Pd and Ru, supported on solid acids, such as Al2O3, SiO2-Al2O3 and nitric-acid-treated carbon (NAC), which revealed that the acidity of catalysts determine the HDO activity. The HDO reaction results observed in Figure 1 exhibited the predominant formation of fully hydrogenated cyclohexane on SiO2-Al2O3-supported metals which contain the most acid sites among three solid acids used in this study. Compared with solid acids, noble metals less affected the catalysis results, which indicates that the design of more acidic catalysts is important to obtain the higher HDO activity. For example, the number of NAC’s acid sites is smaller than that of SiO2-Al2O3 We suggest the reaction pathway of guaiacol’s hydrogenation followed by its hydrodeoxygenation on the basis of the study on the roles of metal nanoparticles and acid matrices for the catalytic conversion of guaiacol to cyclohexane as described in Figure 2. The HDO reaction of guaiacol can be compsed of hydrogenation of phenyl ring followed by deoxygenation of hydroxy and methoxy groups. The first step of -supported catalysts, and 2-methoxycyclohexanol, which is obtained by the hydrogenation of guaiacol’s phenyl ring, became the ma
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