Citation: Di Ma, Shenglu Lu, Xiaohui Liu, Yong Guo, Yanqin Wang. Depolymerization and hydrodeoxygenation of lignin to aromatic hydrocarbons with a Ru catalyst on a variety of Nb-based supports[J]. Chinese Journal of Catalysis, ;2019, 40(4): 609-617. doi: S1872-2067(19)63317-6 shu

Depolymerization and hydrodeoxygenation of lignin to aromatic hydrocarbons with a Ru catalyst on a variety of Nb-based supports

Shanghai Key Laboratory of Functional Materials Chemistry, Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China

Received Date: 20 December 2018
Revised Date: 25 January 2019

Fund Project: The work was supported by the National Natural Science Foundation of China (21832002, 21872050, 21808063) and the Natural Science Foundation of Shanghai (18ZR1408500).

Efficient conversion of lignin to aromatic hydrocarbons via depolymerization and subsequent hydrodeoxygenation is important. Previously, we found that NbO_x species played a key role in the activation and cleavage of C-O bonds in lignin and its model compounds. In this study, commercial niobic acid (HY-340), niobium phosphate (NbPO-CBMM) and lab-made layered niobium oxide (Nb₂O₅-Layer) were chosen as supports to study the effect of Brönsted and Lewis acids on the activation of C-O bonds in lignin conversion. A variety of Ru-loaded, Nb-based catalysts with different Ru particle sizes were prepared and applied to the conversion of p-cresol. The results show that all the Ru/Nb-based catalysts produce high mole yields of C₇-C₉ hydrocarbons (82.3%-99.1%). What's more, Ru/Nb₂O₅-Layer affords the best mole yield of C₇-C₉ hydrocarbons and selectivity for C₇-C₉ aromatic hydrocarbons, of up to 99.1% and 88.0%, respectively. Moreover, it was found that Lewis acid sites play important roles in the depolymerization of enzymatic lignin into phenolic monomers and the cleavage of the C-O bond of phenols. Additionally, the electronic state and particle size of Ru are significant factors which influence the selectivity for aromatic hydrocarbons. A partial positive charge on the metallic Ru surface and a smaller Ru particle size are beneficial in improving the selectivity for aromatic hydrocarbons.
- Lignin,
- Aromatic hydrocarbons,
- Nb-based supports,
- Lewis acid sites,
- Ru
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