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首页> 外文期刊>Catalysis science & technology >Complete utilization of waste lignin:preparation of lignin-derived carbon supports and conversion of lignin-derived guaiacol to nylon precursors
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Complete utilization of waste lignin:preparation of lignin-derived carbon supports and conversion of lignin-derived guaiacol to nylon precursors

机译：Complete utilization of waste lignin:preparation of lignin-derived carbon supports and conversion of lignin-derived guaiacol to nylon precursors

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The valorization of waste lignin for the production of high value-added chemicals is energetically and environmentally important.In this study,a new catalytic process was developed to produce raw materials for nylon production utilizing 100% of waste lignin emitted from industrial processes.Guaiacol,extracted from technical lignin,was converted to phenol through a hydrodeoxygenation reaction over carbon-supported MoO2 catalysts.The extracted lignin oil served as a carbon source to prepare lignin-derived porous carbons possessing an interconnected porous structure with a large pore size and volume via a nanocasting method.The high dispersion of MoO2 deposited on the porous carbon support enables a high guaiacol conversion(98.4%)and high phenol selectivity(73.7%)compared to those of a typical activated carbon support.The resulting phenol was selectively converted to cyclohexanone or cyclohexanol,depending on the controlled hydrogenation environments over carbon-supported Pd catalysts.The remaining solid residue during lignin extraction was also used as a carbon support to load Pd catalysts.The produced cyclohexanone and cyclohexanol were further converted to caprolactam and adipic acid,the main reagents used to produce nylon-6 and nylon-6,6 fibres,respectively.This process was demonstrated using real kraft and Klason lignin released from industry.The mass of guaiacol produced from 20 g of kraft lignin was 0.07 g,yielding either 0.032 g caprolactam or 0.043 g adipic acid,with a total yield of 0.15-0.25%.This study sheds light on utilizing waste lignin as a resource by producing not only guaiacol raw material for the production of high value-added nylon,but also a carbon support used for catalytic conversion.

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