煅烧温度对Mo-Mn/TiO2催化剂脱硝脱汞活性的影响

doi:10.16085/j.issn.1000-6613.2017-0649

摘要/Abstract

摘要： 研究了浸渍法制备Mo-Mn/TiO₂（MMT）催化剂过程中煅烧温度（300℃、450℃、600℃、750℃）对Mo-Mn/TiO₂（MMT）催化剂协同脱硝脱汞活性的影响。结果表明，较低的煅烧温度更有利于MMT催化剂的协同脱硝脱汞性能，同时可有效降低SO₂对催化剂活性的抑制作用，最佳煅烧温度为300℃。利用BET、XRD、H₂-TPR、FTIR和XPS等表征手段对催化剂的理化性质进行了表征，结果表明较低的煅烧温度有利于提高催化剂中活性成分所占的比例，增加金属氧化物在TiO₂载体表面的分散度，提高催化剂的低温还原性能。随着煅烧温度的升高，催化剂的比表面积和孔容均逐渐减小，平均孔径先增大后减小，且在高温下发生烧结；MnO₂逐渐向Mn₂O₃转变，锐钛矿型TiO₂逐渐向金红石型转变，同时MoO₃由非晶态逐渐向晶态的转化，致使催化剂的协同脱硝脱汞活性下降。

关键词: 煅烧温度, 选择性催化还原, Mo-Mn/TiO₂, 固定床, 催化剂

Abstract: The influence of calcination temperature (300℃、450℃、600℃、750℃)on the activity of Mo-Mn/TiO₂ (MMT) catalysts prepared by an impregnation method for NO_x and Hg⁰ removal was studied. The results showed that, relatively low calcination temperature was beneficial to improve the catalytic activity of MMT catalysts, and reduce the inhibitory effect of SO₂ effectively, and the best calcination temperature was 300℃. Physicochemical characteristics of MMT catalysts were investigated by using different analysis techniques of BET, XRD, H₂-TPR, FTIR and XPS. The studies showed that relatively low calcination temperature could give high the proportion of active components and high dispersion of metallic oxide on the surface of TiO₂ as well as increase the low temperature reduction property of catalysts. With the increase of calcination temperature, the specific surface area and total pore volume gradually decreased. The average pore diameter first increased and then decreased, because of the agglomeration of MMT occurred at high calcination temperature. At the same time, the gradually conversion of MnO₂ to Mn₂O₃, and the transformations of the crystalline phase of TiO₂ from anatase to rutile and MoO₃ from amorphous to crystalline, synergistically led to the decrease of catalytic activity on the removal of NO_x and Hg⁰.

Key words: calcination temperature, selective catalytic reduction (SCR), Mo-Mn/TiO₂, fixed-bed, catalyst

中图分类号:

X511

胡鹏, 段钰锋, 陈亚南, 丁卫科, 李春峰, 李娜, 柳帅, 刘猛, 王双群. 煅烧温度对Mo-Mn/TiO₂催化剂脱硝脱汞活性的影响[J]. 化工进展, 2018, 37(01): 119-127.

HU Peng, DUAN Yufeng, CHEN Ya'nan, DING Weike, LI Chunfeng, LI Na, LIU Shuai, LIU Meng, WANG Shuangqun. Influence of calcination temperature on the activity of Mo-Mn/TiO₂catalyst for NO_x and Hg⁰ removal[J]. Chemical Industry and Engineering Progress, 2018, 37(01): 119-127.

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煅烧温度对Mo-Mn/TiO₂催化剂脱硝脱汞活性的影响

Influence of calcination temperature on the activity of Mo-Mn/TiO₂catalyst for NO_x and Hg⁰ removal

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