Oxide Catalysts with Ultrastrong Resistance to SO2 Deactivation for Removing Nitric Oxide at Low Temperature. Issue 42 (2nd September 2019)

• Record Type: Journal Article
• Authors: Ma, Zhaoxia; Sheng, Liping; Wang, Xinwei; Yuan, Wentao; Chen, Shiyuan; Xue, Wei; Han, Gaorong; Zhang, Ze; Yang, Hangsheng; Lu, Yunhao; Wang, Yong
• Is Part Of: Advanced materials. Volume 31:Issue 42(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-09-02
• Subjects: in situ TEM -- low temperature -- selective catalytic reduction -- SO2 resistance -- steric hindrance; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201903719
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Nitrogen oxides are one of the major sources of air pollution. To remove these pollutants originating from combustion of fossil fuels remains challenging in steel, cement, and glass industries as the catalysts are severely deactivated by SO2 during the low‐temperature selective catalytic reduction (SCR) process. Here, a MnO X /CeO2 nanorod catalyst with outstanding resistance to SO2 deactivation is reported, which is designed based on critical information obtained from in situ transmission electron microscopy (TEM) experiments under reaction conditions and theoretical calculations. The catalysts show almost no activity loss (apparent NO X reaction rate kept unchanged at 1800 µmol g −1 h −1 ) for 1000 h test at 523 K in the presence of 200 ppm SO2 . This unprecedented performance is achieved by establishing a dynamic equilibrium between sulfates formation and decomposition over the CeO2 surface during the reactions and preventing the MnO X cluster from the steric hindrance induced by SO2, which minimized the deactivation of the active sites of MnO X /CeO2 . This work presents the ultralong lifetime of catalysts in the presence of SO2, along with decent activity, marking a milestone in practical applications in low‐temperature selective catalytic reduction (SCR) of NO X . Abstract : A low‐temperature selective catalytic reduction (SCR) catalyst (MnO X /CeO2 ) with outstanding SO2 resistance is designed and fabricated. This unprecedented performance is achieved by establishing a dynamic equilibrium between sulfate formation and decomposition over the CeO2 surface during the reactions and preventing the MnO x cluster from the steric hindrance induced by SO2, which minimizes the deactivation of the active sites of MnO x /CeO2 .