化工进展

• •    

1,2-二氯乙烷在CoxTi1-x氧化物上的催化降解性能

石怀启,朱鹏飞,吴帅妮,李娜,胡朝霞,陈守文   

  1. 南京理工大学环境与生物工程学院
  • 收稿日期:2020-09-27 修回日期:2021-01-18 发布日期:2021-03-02
  • 通讯作者: 胡朝霞

Catalytic degradation of 1,2-dichloroethane on CoxTi1-x composite oxides catalyst

  • Received:2020-09-27 Revised:2021-01-18 Published:2021-03-02

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

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

中图分类号: 

版权所有 © 《化工进展》编辑部


本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn