Catalytic hydrodeoxygenation of 5-hydroxymethylfurfural into 2,5-dimethylfuran has received great interest in recent years. In this work, a ternary Ni–Al/CoOx-1 catalyst was fabricated, which provided 96% yield of DMF from in situ hydrodeoxygenation of HMF under mild reaction conditions. XRD, TEM and TPR revealed that the addition of Al to the Ni–Co bimetallic system could make the structure more stable and improve the dispersion of Ni and Co species. XPS, CO-DRIFTS and EPR verified that an enhanced electron transfer from Co species to Ni occurred on Ni–Al/CoOx-1. Reaction mechanism studies unraveled that the Al addition results in promoting in situ H₂ production from 2-propanol and accelerating the aldehyde group hydrogenation to a hydroxymethyl group and the subsequent hydrogenolysis into a methyl group, due to the formation of a charge separated metal-couple-site (Ni^δ−–Co^δ+) and stronger Lewis acid sites in Ni–Al/CoOx-1. In addition, this ternary Ni–Al/CoOx-1 catalyst exhibits superior recyclability without significant loss of activity for 7 cycles.

中文翻译：

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Ni-Al/CoOx 催化 5-羟甲基糠醛在低温下加氢脱氧为 2,5-二甲基呋喃，无需外部氢气

近年来，5-羟甲基糠醛催化加氢脱氧生成2,5-二甲基呋喃引起了人们的极大兴趣。在这项工作中，制备了一种三元 Ni-Al/CoOx-1 催化剂，在温和的反应条件下，HMF 的原位加氢脱氧产生了 96% 的 DMF 。XRD、TEM 和 TPR 表明，在 Ni-Co 双金属体系中加入 Al 可以使结构更加稳定并改善 Ni 和 Co 物种的分散。XPS、CO-DRIFTS 和 EPR 证实，Ni-Al/CoOx-1 上发生了从 Co 物种到 Ni 的电子转移增强。反应机理研究表明，添加铝会促进原位H ₂由于形成电荷分离的金属对位点 (Ni ^{δ -} –Co ^{δ +} ) 和更强的路易斯酸，由 2-丙醇生产并加速醛基氢化为羟甲基，随后氢解为甲基Ni-Al/CoOx-1 中的位点。此外，这种 Ni-Al/CoOx-1 三元催化剂表现出优异的可回收性，并且在 7 次循环后活性没有显着损失。