催化作用
双功能
化学
烧结
吸附
化学工程
烟气
无机化学
选择性催化还原
热液循环
动力学
氧化还原
双功能催化剂
材料科学
有机化学
物理
量子力学
工程类
作者
Xiaodi Li,Shan Ren,Zhichao Chen,Yanhua Jiang,Mingming Wang,Liang Wang,Manyi Liu
标识
DOI:10.1016/j.seppur.2023.124760
摘要
It is indeed a challenging problem to simultaneously remove NO and CO from the steel sintering flue gas, in which a bifunctional catalyst has proven to be an efficient solution for removing both pollutants at low temperature. In this study, four different crystalline phases of MnO2 (α-, β-, γ-, and δ-) catalysts were synthesized via a facile hydrothermal method, and the effects of their crystal structure, morphology, and physicochemical properties on the catalytic performance for NO reduction and CO oxidation were elucidated. The results indicated that γ-MnO2 catalyst exhibited the best catalytic activity, achieving 90% NO removal efficiency and 82% CO conversion rate at 175 °C. Reaction kinetics confirmed that γ-MnO2 catalyst exhibited a lower Ea for both NO reduction and CO oxidation compared to α-MnO2, β-MnO2 and δ-MnO2 catalysts. Meanwhile, the interaction of between NH3-SCR and CO catalytic oxidation reactions over the catalysts was also studied. Intriguingly, it was found that the presence of CO enhanced the catalytic activity of γ-MnO2 catalyst in the NH3-SCR reaction. The results of NO + O2-TPD and in situ DRIFTS experiments revealed that CO contributed to the adsorption and oxidation of NO, thus promoting the L-H pathway over γ-MnO2 catalyst. Finally, a possible mechanism model for simultaneous removal of NO and CO over γ-MnO2 catalyst was proposed.
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