Ce regulated surface properties of Mn/SAPO-34 for improved NH3-SCR at low temperature. Issue 66 (4th November 2020)

• Record Type: Journal Article
• Authors: Chen, Qizhi; Yang, Yong; Luo, Hang; Liu, Zuohua; Tong, Zhangfa; Tao, Changyuan; Du, Jun
• Is Part Of: RSC advances. Volume 10:Issue 66(2020)
• Page Start: 40047
• Page End: 40054
• Publication Date: 2020-11-04
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra06639g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Ce modified MnO x /SAPO-34 was prepared and investigated for low-temperature selective catalytic reduction of NO x with ammonia (NH3 -SCR). Abstract : Ce modified MnO x /SAPO-34 was prepared and investigated for low-temperature selective catalytic reduction of NO x with ammonia (NH3 -SCR). The 0.3Ce–Mn/SAPO-34 catalyst had nearly 95% NO conversion at 200–350 °C at a space velocity of 10 000 h −1 . Microporous SAPO-34 as the support provided the catalyst with increased hydrothermal stability. XPS and H2 -TPR results proved that the Mn 4+ and Oα content increased after incorporation of Ce, this promoted the conversion of NO at low temperature via a 'fast SCR' route. NH3 -TPD measurements combined oxidation experiments of NO, NH3 indicated the reduction of both the surface acidity and the amount of acid sites, which effectively decreased the NH3 oxditaion to NO or N2 O at elevated temperature and promoted the catalytic selectivity for nitrogen. A redox cycle between manganese oxide and Ce was assumed for the active oxygen transfer and facilitated the catalyst durability.