催化剂 CoOx 的制备、表征及其在分子氧选择性氧化环己烷中的应用

摘要

以钴盐为前驱体，通过简单的高温焙烧方式制备得到CoOx固体，并用X线衍射、红外光谱、固体紫外可见漫反射光谱、透射电镜等方法对该氧化物进行表征，然后将该氧化物用于分子氧选择性多相催化氧化环己烷制备环己醇和环己酮即KA-油．结果表明，所得到的CoOx氧化物呈现出立方Co3 O4的晶形结构，在催化环己烷的氧化反应中，不加引发剂，催化剂用量为100 mg，120℃反应2 h，环己烷的转化率可以达到8．99％，而KA-油的选择性可以达到96．6％，呈现出明显的催化活性．%CoOx oxide could be obtained by a simple high-temperature calcination of cobalt salt as precursor and characterized by XRD,FT-IR,UV-vis DRS and TEM techniques.The obtained oxide was then used as heterogeneous catalyst in the aerobic selective oxidation of cyclohexane for the preparation of KA-oil ( a mixture of cyclohexanone and cyclohexanol) .The results showed that CoOx oxide displayed the characteristic crystalline structure of cubic Co3 O4 .In the catalytic reaction in the absence of initiator and only 100 mg of catalyst was used, the cyclohexane conversion reached up to 8.99% and KA-oil selectivity reached up to 96.6%after 6 h of reaction at 120 ℃,which presented the obvious catalytic activity.