Catalytic hydrogenation of levulinic acid to gamma-valerolactone over lignin-metal coordinated carbon nanospheres in water

文献类型： 外文期刊

第一作者： Xu, Yingying

作者： Xu, Yingying;Liang, Yining;Qi, Xinhua;Guo, Haixin

作者机构：

关键词： Biomass; Alkali lignin; Carbon spheres; Catalytic hydrogenation; gamma-Valerolactone

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.2； 五年影响因子：7.8 ）

ISSN： 0141-8130

年卷期： 2023 年 240 卷

页码：

收录情况： SCI

摘要： The hydrogenation of levulinic acid (LA) to gamma-valerolactone (GVL) has attracted much attention, as GVL can be used as biofuel, green solvent, and platform chemical. Inspired by Stober method, various lignin-metal coordinated colloidal nanospheres (LCS) from lignin and cetyltrimethylammonium bromide (CTAB) were synthesized in which the metal ions (Co2+) replace formaldehyde as the crosslinker. The characterization of the catalyst revealed that alkali lignin was first self-assembled with CTAB through electrostatic attraction to form a lignin polymer, the subsequent addition of metal ions (Co2+) promoted the aggregation of lignin polymers and generated the LCS. Increasing calcination temperature for LCS resulted in the Co2+ being reduced to metallic Co. The lignin-metal coordinated colloidal nanospheres calcined at 500 degrees C possess both CoO and metallic Co active sites, which effectively accelerated the hydrogenation of levulinic acid (LA) to gamma-valerolactone (GVL) than simplex metallic Co active sites. A 99.8 % yield of GVL with 100 % LA conversion was obtained after 60 min reaction time at 200 degrees C and 2 MPa H-2.

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