Abstract: With the rapid development of industry and economy, the emission of chlorine-containing volatile organic compounds (CVOCs) is increasing, which is harmful to human health and environment. Catalytic combustion is one of the most effective and economical methods to treat CVOCs. CoxTi1-x composite oxides with different Ti loading were prepared by sol-gel method, their physical and chemical properties were characterized and the catalytic degradation performance for 1,2-dichloroethane (1,2-DCE) was investigated. The results show that the CoxTi1-x composite oxides form amorphous Co-O-Ti solid solution when Ti loading is less than 0.6. The addition of Ti increases the surface acid sites and the adsorbed oxygen content for the prepared CoxTi1-x catalysts. Among them, Co0.8Ti0.2 has large specific surface area, good redox performance, abundant surface adsorbed oxygen and medium-strong acid sites, and high catalytic oxidation ability for 1,2-DCE. When the gas space-time velocity is 20,000mL/(g·h) and the concentration of 1,2-DCE is 4060mg/m3, the temperature required for the conversion of 1,2-DCE to 90% is 318℃. Besides, Co0.8Ti0.2 also exhibits good stability at 380℃ for a long time.

Key words: catalyst, composites, binary mixture, dichloroethane, cobalt oxide

摘要： 随着工业和经济的快速发展，含氯挥发性有机化合物（CVOCs）排放量日益增多，对人体健康以及环境造成严重危害。催化燃烧法是治理CVOCs最有效和经济的方法之一。采用溶胶凝胶法制备出了不同Ti掺杂量的CoxTi1-x复合氧化物，并对其物理化学性质进行了表征。研究了CoxTi1-x催化剂对1,2-二氯乙烷（1,2-DCE）的催化氧化性能。结果表明，当Ti掺杂量低于0.6时，CoxTi1-x复合氧化物呈现非晶相结构，形成无定型结构的Co-O-Ti固溶体。Ti元素的掺杂增加了CoxTi1-x复合氧化物的表面酸位点及吸附态氧含量。其中，Co0.8Ti0.2催化剂具有较大的比表面积、良好的氧化还原性能、丰富的表面吸附态氧及中强酸位点，对1,2-DCE表现出较高催化氧化能力；在气时空速为20000mL/(g·h)、1,2-DCE浓度为4060mg/m3的条件下，其对1,2-DCE的转化率达90%时所需温度为318℃。此外，在380℃长时间运行时，Co0.8Ti0.2也显示出较好的稳定性。

关键词: 催化剂, 复合材料, 二元混合物, 二氯乙烷, 钴氧化物