Co-N-C催化剂的构筑及在亚砜催化氢化中的应用

Construction of Co-N-C catalyst and its application in the catalytic hydrogenation of sulfoxide

摘要:

利用N-乙酰-丙氨酸修饰改性的壳聚糖作为有机含氮配体，与钴离子配位形成前驱体，随后通过在不同温度下热解制备得到一系列的Co-N-C型催化剂（Co/CNAA-T）。通过多种表征手段，研究了热解温度对所制备的Co/CNAA-T催化剂的形貌、结构、组成的影响，认为Co-Nx位点是催化活性中心，并评价了Co/CNAA-T催化剂在甲基苯基亚砜催化氢化反应中的活性，探究了热处理温度对催化剂催化氢化性能的影响。其中，Co/CNAA-900在140oC、3MPa氢压下反应11个小时表现出最佳的催化活性，原料转化率达到了97.2%，选择性>99%。

Abstract:

A series of Co-N-C catalysts (Co/CNAA-T) were prepared successfully via the pyrolysis of precursor formed by N-acetyl-alanine modified chitosan and cobalt ion at different temperatures. Characterizations were employed to study the effect of pyrolysis temperature on the morphology, structure and composition of the Co-N-C catalysts. It is considered that the Co-Nx site is the catalytic activity center. The prepared Co/CNAA-T catalysts were applied in hydrogenation of methyl phenyl sulfoxide. Meanwhile, the effect of pyrolysis temperature on the catalytic hydrogenation performance of the catalyst was explored. Among them, Co/CNAA-900 shows the best catalytic activity at 140oC and 3MPa hydrogen pressure for 11 hours. The conversion rate reaches 97.2% and the selectivity is more than 99%.