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个人信息Personal Information
教授
博士生导师
硕士生导师
性别:女
毕业院校:中科院大连化学物理研究所
学位:博士
所在单位:环境学院
学科:环境科学与工程. 环境工程. 环境科学
办公地点:环境楼B511
电子邮箱:quzhenping@dlut.edu.cn
The Al promotional effect for Ce0.4Zr0.6O2 mixed oxides in selective catalytic oxidation of ammonia to nitrogen
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论文类型:期刊论文
发表时间:2015-06-16
发表刊物:SEPARATION AND PURIFICATION TECHNOLOGY
收录刊物:SCIE、EI、Scopus
卷号:147
页面范围:24-31
ISSN号:1383-5866
关键字:NH3 oxidation; Ce0.4Zr0.6O2 catalyst; Al modified; Oxygen species; Oxygen vacancy
摘要:A novel Al doped Ce0.4Zr0.6O2 catalyst prepared by surfactant-templated method was tested for NH3 selective oxidation, and it was found that the addition of an appropriate amount of Al to Ce0.4Zr0.6O2 catalysts improved the NH3 oxidation activity. Strikingly, the NH3 conversion obtained on 3% Al-Ce0.4Zr0.6O2 catalyst was, on average, 12.7% higher than that of undoped Ce0.4Zr0.6O2 catalyst. The XRD and H-2-TPR results showed that the inclusion of Al components resulted in the formation of smaller sized CeO2 (4.4-5.8 nm), and improved the oxygen mobility and reducibility. The normalized BET and NH3-TPD analysis also confirmed that the adsorption centers for NH3 in Al-Ce0.4Zr0.6O2 catalysts was increased with the Al addition. More importantly, the oxygen vacancies, of which the amount was increased by modification of Al, were considered as the essential oxygen adsorption and activation sites. Consequently, more active oxygen species (O- and O2-) were formed, which facilitated the NH3 oxidation reaction. (C) 2015 Elsevier B.V. All rights reserved.