Model molecule investigation for the reductive catalytic fractionation of lignin using innovative magnetic catalysts

The use of innovative heterogeneous catalysts for the reductive catalytic fractionation (RCF) process of lignocellulosic biomass has been shown to effectively produce high yields of phenolic monomers derived from lignin while simultaneously recovering highly delignified cellulose-rich pulps. However, achieving high selectivity for platform chemicals is challenging due to the complexity and heterogeneity nature of the starting material. The variety of moieties linked by different types of bonds in the polymeric structure of lignin complicates the process, leading to a mixture of products. To address these challenges and refine the process for a scale-up in industrial production, model molecule studies are essential to understand the reaction mechanisms and interactions in a controlled environment, providing insights that can be applied to improve the selectivity and efficiency of the overall process. In this work, a comprehensive model molecule study involving an innovative catalyst composed of Ruthenium supported on magnetic iron oxides is conducted based on prior work of the group. The primary goal was to optimize the RCF process for lignocellulosic biomass valorization by examining various reaction conditions. By systematically altering parameters such as temperature, pressure, solvent composition, and catalyst used, insights into the mechanisms and efficiency of the process are reported. In addition, this study can also suggest the ideal parameters for a possible reprocessing and further upgrading of the lignin oil produced in the RCF step, with the final aim of increasing yield into fewer, highly desirable, aromatic compounds.