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Ce、Zr改性Mn/ZSM-5分子筛催化剂对C3H6-SCR反应性能的影响
作者: 川1 3  芳1 许俊强1 秦娅华1 谢家庆2 
单位:(1. 重庆理工大学化学化工学院 重庆 400054 2. 四川理工学院化学化工学院 四川 自贡 643000  3. 中煤科工集团重庆研究院有限公司 重庆 400039) 
关键词:分子筛催化剂 选择催化还原 丙烯 改性 低温活性 
分类号:TQ170.9
出版年,卷(期):页码:2019,47(4):0-0
DOI:
摘要:

 采用浸渍法制备了一系列Ce、Zr改性Mn/ZSM-5分子筛催化剂,对其C3H6-SCR(选择性催化还原)反应性能进行了评价,研究了Ce、Zr的引入对Mn/ZSM-5分子筛催化剂选择催化还原NO的影响,并采用X射线衍射、比表面积测量、扫描电子显微镜、NH3-程序升温脱附(TPD)、H2-程序升温还原(TPR)等表征手段对催化剂的物理化学性质进行了表征。结果表明:Ce、Zr改性Mn/ZSM-5分子筛催化剂C3H6-SCR反应中表现出较为优异的催化活性,最优配比的20%Mn-7%Ce-1%Zr/ZSM-5催化剂在200 ℃、30 000 h?1的空速下,催化剂的最大脱硝效率达到87%,且操作温度窗口T50=150~380 ℃。活性组分Mn以MnO2和Mn2O3形式存在,且与助剂Ce、Zr高度分散在催化剂表面,而且形成协同作用;催化剂表面的弱酸和中强酸和氧化还原性能的增强有利于C3H6-SCR低温催化活性的提高。

 A series of Ce, Zr modified Mn/ZSM-5 molecular sieve catalysts were prepared by an impregnation method, and the C3H6- selective catalytic reduction (SCR) reaction performance was evaluated. The effects of Ce and Zr on the SCR of NO on Mn/ZSM-5 molecular sieve catalyst were investigated. The physical and chemical properties of the catalysts were characterized by X-ray diffraction, specific surface area measurement, scanning electron microscopy, NH3-temperature programmed desorption(TPD), and H2-TPR, respectively. The results show that Ce and Zr modified Mn/ZSM-5 molecular sieve catalyst shows an excellent catalytic activity in the C3H6-SCR reaction. At 200 ℃ and a space velocity of 30 000 h?1, the optimal ratio of 20%Mn-7%Ce-1%Zr/ZSM-5 catalyst has a maximum NO conversion of 87% and NO conversion of >50% at 150?380 ℃ in a wide operating temperature range. The active component Mn exists in the forms of MnO2 and Mn2O3. Mn, Ce and Zr are mainly dispersed on the catalyst surface and form a synergy. The weak acid and moderate acidity of the catalyst surface and the enhancement of the redox properties are beneficial to the improvement of low-temperature catalytic activity in C3H6-SCR.

基金项目:
国家自然科学基金(21206202);重庆市重点产业共性关键技术创新专项(cstc2016zdcy-ztzx0020-02);四川省科技计划项目(2017GZ0421);重庆市第五批高等学校优秀人才计划项目(2017-28);重庆市研究生科研创新项目(CYS17283),重庆市巴南区科技计划项目(2017TJ10,2018TJ03)。
作者简介:
参考文献:

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