Catalytic Pyrolysis of Lignin Model Compounds (Pyrocatechol, Guaiacol, Vanillic and Ferulic Acids) over Nanoceria Catalyst for Biomass Conversion

Understanding the mechanisms of thermal transformations model lignin compounds (MLC) over nanoscale catalysts is important for improving technologic processes occurring in pyrolytic conversion lignocellulose biomass into biofuels and value-added chemicals. Herein, we investigate catalytic pyrolysis MLC (pyrocatechol (P), guaiacol (G), ferulic (FA), vanillic acids (VA)) nanoceria using FT-IR spectroscopy, temperature-programmed desorption mass spectrometry (TPD MS), thermogravimetric analysis (DTG/DTA/TG). spectroscopic studies indicate that active groups aromatic rings P, G, VA, FA as well carboxylate VA are involved interaction with surface. We explore general transformation different surface complexes identify their decomposition products. demonstrate acid occurs by decarboxylation. When used a precursor, this reaction generates 4-vinylguaiacol. Complexes formed through both ring decompose on CeO2 to generate hydroxybenzene. The formation alkylated products accompanies due transalkylation