A review on the characterization of metal active sites over Cu-based and Fe-based zeolites for NH3-SCR. Issue 43 (28th September 2022)

• Record Type: Journal Article
• Authors: Chen, Jialing; Huang, Wei; Bao, Sizhuo; Zhang, Wenbo; Liang, Tingyu; Zheng, Shenke; Yi, Lan; Guo, Li; Wu, Xiaoqin
• Is Part Of: RSC advances. Volume 12:Issue 43(2022)
• Page Start: 27746
• Page End: 27765
• Publication Date: 2022-09-28
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2ra05107a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The application and limitation of the above characterization methods for qualitative and quantitative determination of various metal active sites in Cu-based or Fe-based zeolites for NH3 -SCR are reviewed. Abstract : Cu-based and Fe-based zeolites are promising catalysts for NH3 -SCR due to their high catalytic activity, wide temperature window and good hydrothermal stability, while the detailed investigation of NH3 -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 NH3 -SCR reactions based on advanced characterization methods such as UV-vis absorption (UV-vis), temperature-programmed reduction with H2 (H2 -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 NH3 -SCR reaction mechanism over metal-based zeolites.