Catalytic degradation of 1,2-dichloroethane on CoxTi1-xcomposite oxides

doi:10.16085/j.issn.1000-6613.2020-1967

Abstract

Abstract:

With the rapid development of industry and economy, the increasing emission of chlorine-containing volatile organic compounds (CVOCs) have caused serious harm to human health and environment. Catalytic combustion is one of the most effective and economical methods to treat CVOCs. Co_xTi_1-_x composite oxides with different Ti loading were prepared by sol-gel method, their physical and chemical properties were characterized and the catalytic performance for 1,2-dichloroethane (1,2-DCE) degradation was investigated. The results showed that the Co_xTi_1-_xcomposite oxides formed amorphous Co-O-Ti solid solution when Ti loading was less than 0.6. The addition of Ti increased the surface acid sites and the adsorbed oxygen content for the prepared Co_xTi₁_-xcatalysts. Among them, Co_0.8Ti_0.2 had large specific surface area, good redox performance, abundant surface adsorbed oxygen and medium-strong acid sites, and hence showed high catalytic oxidation ability for 1,2-DCE. When the gas space-time velocity was 20000mL/(g·h) and the concentration of 1,2-DCE was 4060mg/m³, the temperature required for 90% conversion of 1,2-DCE was 318℃. Besides, Co_0.8Ti_0.2 also exhibited good stability at 380℃ in long-time runs.

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。本文采用溶胶-凝胶法制备出了不同Ti掺杂量的Co_xTi_1-_x复合氧化物，并对其物理化学性质进行了表征。研究了Co_xTi_1-_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，Co_xTi_1-_x复合氧化物呈现非晶相结构，形成无定形结构的Co-O-Ti固溶体。Ti元素的掺杂增加了Co_xTi_1-_x复合氧化物的表面酸位点及吸附态氧含量。其中，Co_0.8Ti_0.2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表现出较高的催化氧化能力；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，Co_0.8Ti_0.2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

CLC Number:

TB331

SHI Huaiqi, ZHU Pengfei, WU Shuaini, LI Na, HU Zhaoxia, CHEN Shouwen. Catalytic degradation of 1,2-dichloroethane on Co_xTi_1-_xcomposite oxides[J]. Chemical Industry and Engineering Progress, 2021, 40(8): 4253-4258.

石怀启, 朱鹏飞, 吴帅妮, 李娜, 胡朝霞, 陈守文. 1,2-二氯乙烷在Co_xTi_1-_x氧化物上的催化降解性能[J]. 化工进展, 2021, 40(8): 4253-4258.

Figures/Tables 9

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样品	Co³⁺/Co^{2+ ①}	O_ads/O_lat^①	T₅₀^②/℃	T₉₀^②/℃
Co₃O₄	0.707	0.448	320	378
Co_0.8Ti_0.2	0.997	0.500	268	318
Co_0.6Ti_0.4	0.737	0.401	262	358
Co_0.4Ti_0.6	0.584	0.383	294	>420
Co_0.2Ti_0.8	0.500	0.314	306	>420
TiO₂	—	0.167	315	400

样品	Co³⁺/Co^{2+ ①}	O_ads/O_lat^①	T₅₀^②/℃	T₉₀^②/℃
Co₃O₄	0.707	0.448	320	378
Co_0.8Ti_0.2	0.997	0.500	268	318
Co_0.6Ti_0.4	0.737	0.401	262	358
Co_0.4Ti_0.6	0.584	0.383	294	>420
Co_0.2Ti_0.8	0.500	0.314	306	>420
TiO₂	—	0.167	315	400

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