A cobalt-based hydrotalcite-like compound was prepared using a constant-pH coprecipitation method. Cobalt-transition metal oxides (Co₂XAlO, X = Co, Mg, Ca and Ni) were investigated for the deep catalytic oxidation of o-chlorophenol as a typical heteroatom contaminant containing chlorine atoms. The partial substitution of Co by Mg, Ca or Ni in the mixed oxide can promote the catalytic oxidation of o-chlorophenol. The Co₂MgAlO catalyst presented the best catalytic activity, and could maintain 90% o-chlorophenol conversion at 167.1°C, compared only 27% conversion for the Co₃AlO catalyst. The results demonstrated that the high activity could be attributed to its increased low-temperature reducibility, rich active oxygen species and excellent oxygen mobility. In the existence of acid and base sites, catalysts with strong basicity also showed preferred activity. The organic by-products generated during the o-chlorophenol catalytic oxidation over Co₂MgAlO catalyst included carbon tetrachloride, trichloroethylene, 2,4-dichlorophenol, and 2,6-dichloro-p-benzoquinon, et al. This work provides a facile method for the preparation of Co-based composite oxide catalysts, which represent promising candidates for typical chlorinated and oxygenated volatile organic compounds.

使用恒定pH共沉淀法制备钴基类水滑石。研究了钴过渡金属氧化物（Co ₂ XAlO，X = Co，Mg，Ca和Ni）对邻氯苯酚（包含氯原子的典型杂原子污染物）的深度催化氧化的作用。混合氧化物中的Mg，Ca或Ni部分取代Co可以促进邻氯苯酚的催化氧化。Co ₂ MgAlO催化剂表现出最佳的催化活性，在167.1°C时可保持90％的邻氯苯酚转化率，而Co _3的转化率仅为27％AlO催化剂。结果表明，高活性归因于其增加的低温还原性，丰富的活性氧种类和优异的氧迁移率。在存在酸和碱位的情况下，具有强碱性的催化剂也显示出优选的活性。Co ₂ MgAlO催化剂上邻氯苯酚催化氧化过程中产生的有机副产物包括四氯化碳，三氯乙烯，2,4-二氯苯酚和2,6-二氯-对苯醌等。这项工作为制备钴基复合氧化物催化剂提供了一种简便的方法，该催化剂代表了典型的氯化和氧化的挥发性有机化合物的有希望的候选者。