个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 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
The adsorption and catalytic oxidation of the element mercury over cobalt modified Ce-ZrO2 catalyst
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论文类型:期刊论文
发表时间:2016-01-01
发表刊物:RSC ADVANCES
收录刊物:SCIE、EI
卷号:6
期号:91
页面范围:88332-88339
ISSN号:2046-2069
摘要:Co was used as a modifier for Ce-ZrO2 to improve the surface physicochemical properties of the catalysts. The obtained catalysts Co-x-Ce-ZrO2 were investigated for Hg-0 adsorption and oxidation in the temperature range of 100-350 degrees C. The results showed that Co modified catalysts had an excellent Hg-0 removal efficiency. For Co-0.3-Ce-ZrO2, the Hg-0 adsorption efficiency was above 81.5% even after a 164.5 h adsorption test and the Hg-0 oxidation efficiency reached 100% in the temperature range of 100-250 degrees C. XRD, BET and XPS results suggested that the Co modified catalysts had larger surface areas and more oxygen vacancies. H-2-TPR results showed that Co addition improved the redox performance of the catalyst. These results led to a better Hg-0 removal efficiency by the Co modified catalysts. Furthermore, XPS results of Co-0.3-Ce-ZrO2 before and after reaction showed that, during the Hg-0 oxidation process, surface chemisorbed oxygen was dramatically consumed while some Co3+ and Ce4+ changed to Co2+ and Ce3+. This suggested that chemisorbed oxygen participated in the Hg-0 oxidation process. A probable pathway of Hg-0 oxidation was deduced based on these results. The effects of individual flue gas components (O-2, NO, H2O, SO2) on Hg-0 oxidation efficiency were investigated and the results showed that O-2 and NO improved the Hg-0 oxidation efficiency whereas H2O and SO2 inhibited it.