Studies of Thermal Conversion of Acetonelignin in Supercritical Butanol in the Presence of NiCuMo/SiO2 Catalysts

Both industrially implemented and developed technologies for chemical wood processing are aimed at preferable transformation of the cellulose component into target products, while effective methods for processing of lignin, a bulky waste, are as yet unavailable. The present study was focused on the influence of NiCuМо/SiO₂ catalysts on thermal transformations of acetonelignin in the superctirtical butanol medium at 280, 300, 350 °C. Chromatomass spectrometric and ¹³C NMR spectroscopic techniques were used for characterization to the liquid products. Thermochemical transformations of butanol were not observed at the temperature below 300 °C. The butanol conversion was increased up to 36–40 wt % in the presence of the catalysts. In the presence of the NiCuМо/SiO₂ catalysts at 300 °C, the yield of hexane-solluble products of acetonelignin thermotransformations increased by factor of 2.4, while the solid residue yield was factor of 3.3 decreased. Under these conditions, the proportion of methoxyphenols, including syringol, in the hexane-soluble products was factor of 14 lower. ¹³C NMR data indicated that the catalytic transformations of acetonelignin into acetone-soluble liquid products are accompanied by the cleavage of β–O–4 bonds between structural elements of lignin and by a decrease in the content of methoxyl groups predominantly in syringal structural units of the products formed.

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