数字农科院2.0

Boosting selectivity in glucose hydrogenation to sorbitol by optimizing Fe distribution in alloys and supports

文献类型： 外文期刊

作者： Yixin Luo;Jingnan Yang;Fu Li;Xiaomei Zhou;Tongyan Yu;Qingxin Guan;Mo Qiu;Wei Li

作者机构：

关键词： Glucose;Mannitol;NiFe alloy;Selective hydrogenation;Sorbitol

期刊名称： Chemical Engineering Journal

ISSN： 1385-8947

年卷期： 2025 年 513 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： The hydrogenation of glucose to sorbitol using Raney-Ni is a well-established process in industry, but it faces challenges such as high mannitol content, nickel leaching, and catalyst pyrophoricity. Here, Ni6Fe1/Al2O3 nanoflower with high sorbitol selectivity and stability was synthesized from NixFey/Al-LDH precursors, where the distribution of iron in the alloy phase and support can be well-regulated. XANES and FT-EXAFS spectra verified the presence of Fe in the catalyst as NiFe alloy and FeOx. Multiple evidences unveiled that the NiFe alloy phase significantly improving the yield of sorbitol and the iron oxide species can regulate the acidity of the support, thus effectively reducing the byproduct mannitol. Delightfully, the optimal Ni6Fe1/Al2O3 catalyst achieved a sorbitol yield of 99% and a mannitol yield of 0.45%, showing a significant advantage over Ni/Al2O3 (77% and 1.3%) and Raney-Ni (57% and 1.3%) catalysts. Theoretical calculations indicate that the NiFe alloy surface is more conducive to glucose adsorption and sorbitol desorption, and the intrinsic high activity of NiFe alloy phase is due to the downshift of d-band center, which facilitates H* dissociation from the anti-bonding orbital. This study provides significant insights for designing catalysts with high activity and selectivity in converting lignocellulosic biomass.

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