周豪

个人信息Personal Information

副教授

博士生导师

硕士生导师

主要任职:化工海洋与生命学院副院长

性别:男

毕业院校:大连理工大学

学位:博士

所在单位:化工海洋与生命学院

学科:环境工程

办公地点:海洋科学与技术学院 D05 307

联系方式:zhouhao@dlut.edu.cn

电子邮箱:zhouhao@dlut.edu.cn

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Tuning the interlayer cations of birnessite-type MnO2 to enhance its oxidation ability for gaseous benzene with water resistance

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论文类型:期刊论文

发表时间:2018-10-21

发表刊物:CATALYSIS SCIENCE & TECHNOLOGY

收录刊物:SCIE

卷号:8

期号:20

页面范围:5344-5358

ISSN号:2044-4753

摘要:Benzene is a commonly-found air pollutant, which poses a great threat to human health and environmental development around the world. A layered birnessite-type manganese dioxide (MnO2) with a nanosheet morphology was synthesized by a simple and facile solution reaction in this study, which was further modified by Ce3+ and Cu2+ exchanges. For the pristine MnO2, benzene was hardly decomposed below 200 degrees C and only approximate to 40% conversion was achieved at a high temperature of 400 degrees C. However, Ce3+ and Cu2+ modifications significantly improved the activity of MnO2 for benzene decomposition. The Ce-MnO2 and Cu-MnO2 samples started to decompose benzene around 100 degrees C and nearly all benzene could be removed around 250 degrees C for approximate to 410 ppm benzene in dry gas under 120 L g(-1) h(-1) space velocity. Moreover, the Cu-MnO2 catalyst possessed the highest reaction rate (normalized by the surface area) among all the samples, and exhibited high resistance to high-temperature deactivation as well as good stability during continuous long-term testing. The origin of the tremendous effect of interlayer cations on the catalytic activity was studied via XRD, Raman, FT-IR, SEM, (HR)TEM, EDS mapping, BET, XPS and temperature-programmed techniques, which showed that the best performance of the Cu-MnO2 catalyst is attributed to it having the highest reducibility as well as highest lattice oxygen reactivity resulting from the larger number of active oxygen vacancies. Finally, the results of the humid stream reaction demonstrate that using Cu2+ exchange could significantly improve the water-resistant properties of MnO2 catalysts.