The selective aerobic oxidation of 5-hydroxymehtylfurfural (HMF) to synthesize 2,5-diformylfuran (DFF) using nitrogen-doped porous carbons as catalysts was achieved. The N-doped carbon materials were prepared by pyrolysis of chitosan with K₂CO₃ as an activator at 600 to 900°C. The N-doped porous carbon activated at 700 °C showed the highest catalytic activity in the conversion from HMF to DFF without any co-catalyst, i.e., the 95.3% HMF conversion and 94.6% selectivity of DFF under optimum reaction conditions (120°C, 7.5 h and 2.0 MPa O₂). According to the XPS results graphitic nitrogen on the surface of the catalysts played a critical role in the activation of O₂ to form oxygen radicals that facilitated the oxidative dehydrogenation of HMF.

使用氮掺杂的多孔碳作为催化剂，实现了对5-羟基甲基糠基糠醛（HMF）的选择性好氧氧化，以合成2,5-二甲酰呋喃（DFF）。通过在600至900℃下用K ₂ CO ₃作为活化剂对壳聚糖进行热解来制备N掺杂的碳材料。在没有任何助催化剂的情况下，在700°C下活化的N掺杂多孔碳在从HMF到DFF的转化中显示出最高的催化活性，即在最佳反应条件（120°C）下HMF的转化率为95.3％，DFF的选择性为94.6％。 C，7.5 h和2.0 MPa O ₂）。根据XPS结果，催化剂表面的石墨氮在O ₂活化中起关键作用 形成有助于HMF氧化脱氢的氧自由基。