Chen Jialing, Huang Wei, Bao Sizhuo, Zhang Wenbo, Liang Tingyu, Zheng Shenke, Yi Lan, Guo Li, Wu Xiaoqin
Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology Wuhan 430081 China
School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology Wuhan 430205 China
RSC Adv. 2022 Sep 28;12(43):27746-27765. doi: 10.1039/d2ra05107a.
Cu-based and Fe-based zeolites are promising catalysts for NH-SCR due to their high catalytic activity, wide temperature window and good hydrothermal stability, while the detailed investigation of NH-SCR mechanism should be based on the accurate determination of active metal sites. This review systematically summarizes the qualitative and quantitative determination of metal active sites in Cu-based or Fe-based zeolites for NH-SCR reactions based on advanced characterization methods such as UV-vis absorption (UV-vis), temperature-programmed reduction with H (H-TPR), X-ray photoelectron spectroscopy (XPS), X-ray absorption fine structure spectroscopy (XAFS), Infrared spectroscopy (IR), Electron paramagnetic resonance (EPR), Mössbauer spectroscopy and DFT calculations. The application and limitations of different characterization methods are also discussed to provide insights for further study of the NH-SCR reaction mechanism over metal-based zeolites.
铜基和铁基沸石因其高催化活性、宽温度窗口和良好的水热稳定性，是用于氨选择性催化还原（NH-SCR）的有前景的催化剂，而对NH-SCR机理的详细研究应基于活性金属位点的准确测定。本综述基于先进的表征方法，如紫外可见吸收光谱（UV-vis）、氢气程序升温还原（H-TPR）、X射线光电子能谱（XPS）、X射线吸收精细结构光谱（XAFS）、红外光谱（IR）、电子顺磁共振（EPR）、穆斯堡尔光谱和密度泛函理论（DFT）计算，系统地总结了用于NH-SCR反应的铜基或铁基沸石中金属活性位点的定性和定量测定。还讨论了不同表征方法的应用和局限性，为进一步研究金属基沸石上的NH-SCR反应机理提供见解。
