Jin Qijie, Lu Yao, Ji Wenyu, Yang Bo, Xu Mutao, Xue Zhiwei, Dai Yi, Xu Haitao
School of Environmental Science and Engineering, Nanjing Tech University Nanjing 210009 PR China
Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology Nanjing 210044 PR China.
RSC Adv. 2021 Oct 12;11(53):33361-33371. doi: 10.1039/d1ra05801k. eCollection 2021 Oct 8.
A series of W-Zr-O /TiO catalysts with hierarchical pore structure were prepared and used for selective catalytic reduction of NO by NH. Results showed that the 5C-WZ/T had a hierarchical pore structure, and exhibited high catalytic activity and good resistance to water and sulfur poisoning. The activity of the 5C-WZ/T catalyst was close to 100% in the range of 350-500 °C. The hierarchical pore structure not only improved the specific surface area, redox performance, and acid quantity, but also enabled the catalyst to expose more active sites and improved the catalytic performance. Although the reducing atmosphere caused by citric acid monohydrate reduced the chemical adsorption oxygen concentration, it increased the oxygen mobility and Ti ion concentration, which was more conducive to the improvement of catalytic activity. Finally, the NH-SCR reaction over 5C-WZ/T catalyst followed L-H and E-R mechanisms. The monodentate nitrite, bidentate nitrate, gas-phase NO, coordinated NH and NH were the main reaction intermediates.
制备了一系列具有分级孔结构的W-Zr-O /TiO催化剂，并将其用于NH选择性催化还原NO。结果表明，5C-WZ/T具有分级孔结构，表现出高催化活性以及良好的抗水和抗硫中毒性能。5C-WZ/T催化剂在350-500℃范围内活性接近100%。分级孔结构不仅提高了比表面积、氧化还原性能和酸量，还使催化剂能够暴露更多活性位点并提高了催化性能。虽然一水柠檬酸引起的还原气氛降低了化学吸附氧浓度，但增加了氧迁移率和Ti离子浓度，这更有利于催化活性的提高。最后，5C-WZ/T催化剂上的NH-SCR反应遵循L-H和E-R机理。单齿亚硝酸盐、双齿硝酸盐、气相NO、配位NH和NH 是主要反应中间体。
