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个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 精细化工全国重点实验室主任，教育部智能材料化工前沿科学中心执行主任，大连理工大学膜科学与技术研究开发中心主任
性别：女
毕业院校：中国科学院大连化物所
学位：博士
所在单位：化工学院
学科：化学工程. 膜科学与技术. 生物医学工程
联系方式：hgaohong@dlut.edu.cn
电子邮箱：hgaohong@dlut.edu.cn
Promoting Effect of the Core-Shell Structure of MnO2@TiO2 Nanorods on SO2 Resistance in Hg-0 Removal Process
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论文类型：期刊论文
发表时间：2020-01-01
发表刊物：CATALYSTS
收录刊物：SCIE
卷号：10
期号：1
关键字：core-shell structure; alpha MnO2 nanorods; elemental mercury removal; SO2 resistance
摘要：Sorbent of alpha MnO2 nanorods coating TiO2 shell (denoted as alpha MnO2-NR@TiO2) was prepared to investigate the elemental mercury (Hg-0) removal performance in the presence of SO2. Due the core-shell structure, alpha MnO2-NR@TiO2 has a better SO2 resistance when compared to alpha MnO2 nanorods (denoted as alpha MnO2-NR). Kinetic studies have shown that both the sorption rates of alpha MnO2-NR and alpha MnO2-NR@TiO2, which can be described by pseudo second-order models and SO2 treatment, did not change the kinetic models for both the two catalysts. In contrast, X-ray photoelectron spectroscopy (XPS) results showed that, after reaction in the presence of SO2, S concentration on alpha MnO2-NR@TiO2 surface is lower than on alpha MnO2-NR surface, which demonstrated that TiO2 shell could effectively inhibit the SO2 diffusion onto MnO2 surface. Thermogravimetry-differential thermosgravimetry (TG-DTG) results further pointed that SO2 mainly react with TiO2 forming Ti(SO4)O in alpha MnO2-NR@TiO2, which will protect Mn from being deactivated by SO2. These results were the reason for the better SO2 resistance of alpha MnO2-NR@TiO2.