Characterization of WMnCeTiOx catalysts prepared by different methods for the selective reduction of NO with NH3. (7th October 2021)

• Record Type: Journal Article
• Authors: Li, Xiaodi; Han, Zhitao; Shi, Qingdong; Wang, Xinxin; Wu, Xitian; Gao, Yu; Li, Chenglong; Liu, Gang
• Is Part Of: New journal of chemistry. Volume 45:Number 41(2021)
• Page Start: 19456
• Page End: 19466
• Publication Date: 2021-10-07
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d1nj03891e
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : WMnCeTiO x (CP) catalysts showed excellent NH3 -SCR activity and better SO2 tolerance. Abstract : In this work, WMnCeTiO x catalysts were prepared by three methods: coprecipitation (CP), deposition precipitation (DP), and sol–gel (SG). The effects of the preparation methods on the performance of the selective catalytic reduction of NO x with NH3 at 160–360 °C have been investigated systematically. XRD, BET, XPS, H2 -TPR, NH3 -TPD and in situ DRIFTS were used to characterize the physicochemical properties of the prepared WMnCeTiO x catalysts. The results showed that WMnCeTiO x catalysts prepared by CP and DP methods exhibited much better NH3 -SCR performance in a temperature range of 160–300 °C than that prepared by the SG method. Moreover, the WMnCeTiO x catalyst prepared by the CP method exhibited a superior SO2 and H2 O tolerance compared with those prepared by the DP and SG methods. According to characterization results, the excellent performance of the WMnCeTiO x (CP) catalyst could be ascribed to its highly dispersed active components, larger surface area, higher concentrations of Mn 4+ and surface chemisorbed oxygen, more surface acid sites, stronger reduction capacity and better adsorption capacity for NH3 and NO. The in situ DRIFTS results indicated that the NH3 -SCR reaction on all the prepared WMnCeTiO x catalysts obeyed both Langmuir–Hinshelwood and Eley–Rideal mechanisms.