Efficient nanoreactors for the catalytic oxidation of the key platform compound HMF to the high value-added chemical FDCA are highly desirable in the field of biomass transformation. Herein, hierarchical porous bowl-like nitrogen-doped carbon supported AuPd bimetallic (AuPd/pBN_xC) nanoreactors were synthesized by the following steps: precipitation polymerization, carbonization, SiO₂ sphere removal, and sol curing. By changing the amount of nitrogen doping and removing the template, AuPd/pBN_xC nanoreactors with a hierarchical porous structure and adjustable basicity were prepared. The alkaline sites of N_xC carriers provided anchoring sites for metals and had a certain adsorption affinity for HMF and its intermediates. Theoretical calculations and adsorption experiments indicated that the doped nitrogen significantly enhanced the combining capacity between the HMF molecule and nanoreactors. The nanoreactor was used for the tandem oxidation of HMF to FDCA in water, and the highest FDCA yield of 97.6% could be obtained under optimum reaction conditions. The reaction process was evaluated by kinetics calculations, and the oxidation of FFCA to FDCA was confirmed as the rate-determining step. The regeneration experiments showed that the AuPd/pBN_xC nanoreactors could be recycled and reused at least five times without an obvious loss in catalytic activity.

在生物质转化领域中，非常需要用于将关键平台化合物HMF催化氧化成高附加值化学FDCA的高效纳米反应器。本文中，通过沉淀聚合，碳化，SiO ₂球形去除和溶胶固化的以下步骤合成了分级多孔碗状掺氮碳负载的AuPd双金属（AuPd / pBN _x C）纳米反应器。通过改变氮掺杂量并去除模板，制备了具有分级多孔结构和可调节碱度的AuPd / pBN _x C纳米反应器。N _x的碱性位C载体为金属提供了锚固位点，并且对HMF及其中间体具有一定的吸附亲和力。理论计算和吸附实验表明，掺杂氮显着提高了HMF分子与纳米反应器的结合能力。该纳米反应器用于在水中将HMF串联氧化为FDCA，在最佳反应条件下，FDCA的最高收率为97.6％。通过动力学计算评估反应过程，并且确定FFCA氧化成FDCA是决定速率的步骤。再生实验表明，AuPd / pBN _x C纳米反应器可以循环使用至少5次，而催化活性没有明显降低。