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Keywords:

  • carbides;
  • guaiacol;
  • hydrodeoxygenation;
  • lignin;
  • phenols

Abstract

Hydrodeoxygenation (HDO) studies over carbon nanofiber-supported (CNF) W2C and Mo2C catalysts were performed on guaiacol, a prototypical substrate to evaluate the potential of a catalyst for valorization of depolymerized lignin streams. Typical reactions were executed at 55 bar hydrogen pressure over a temperature range of 300–375 °C for 4 h in dodecane, using a batch autoclave system. Combined selectivities of up to 87 and 69 % to phenol and methylated phenolics were obtained at 375 °C for W2C/CNF and Mo2C/CNF at >99 % conversion, respectively. The molybdenum carbide-based catalyst showed a higher activity than W2C/CNF and yielded more completely deoxygenated aromatic products, such as benzene and toluene. Catalyst recycling experiments, performed with and without regeneration of the carbide phase, showed that the Mo2C/CNF catalyst was stable during reusability experiments. The most promising results were obtained with the Mo2C/CNF catalyst, as it showed a much higher activity and higher selectivity to phenolics compared to W2C/CNF.