An in-situ DRIFTs study of Mn doped FeVO4 catalyst by one-pot synthesis for low-temperature NH3-SCR

Fuel ◽  
2022 ◽  
Vol 309 ◽  
pp. 122108
Heng Xie ◽  
Daobing Shu ◽  
Tianhu Chen ◽  
Haibo Liu ◽  
Xuehua Zou ◽  
Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 618
Huan Du ◽  
Zhitao Han ◽  
Xitian Wu ◽  
Chenglong Li ◽  
Yu Gao ◽  

Er-modified FeMn/TiO2 catalysts were prepared through the wet impregnation method, and their NH3-SCR activities were tested. The results showed that Er modification could obviously promote SO2 resistance of FeMn/TiO2 catalysts at a low temperature. The promoting effect and mechanism were explored in detail using various techniques, such as BET, XRD, H2-TPR, XPS, TG, and in-situ DRIFTS. The characterization results indicated that Er modification on FeMn/TiO2 catalysts could increase the Mn4+ concentration and surface chemisorbed labile oxygen ratio, which was favorable for NO oxidation to NO2, further accelerating low-temperature SCR activity through the “fast SCR” reaction. As fast SCR reaction could accelerate the consumption of adsorbed NH3 species, it would benefit to restrain the competitive adsorption of SO2 and limit the reaction between adsorbed SO2 and NH3 species. XPS results indicated that ammonium sulfates and Mn sulfates formed were found on Er-modified FeMn/TiO2 catalyst surface seemed much less than those on FeMn/TiO2 catalyst surface, suggested that Er modification was helpful for reducing the generation or deposition of sulfate salts on the catalyst surface. According to in-situ DRIFTS the results of, the presence of SO2 in feeding gas imposed a stronger impact on the NO adsorption than NH3 adsorption on Lewis acid sites of Er-modified FeMn/TiO2 catalysts, gradually making NH3-SCR reaction to proceed in E–R mechanism rather than L–H mechanism. DRIFTS.

2020 ◽  
Vol 56 (78) ◽  
pp. 11645-11648
Huangqing Ye ◽  
Jiahui Chen ◽  
Yougen Hu ◽  
Gang Li ◽  
Xian-Zhu Fu ◽  

Two-dimensional (2D) multilayered graphitic carbon nanosheets are prepared via a facile, green, and mild method of one-pot hydrothermal carbonization at a temperature below 300 °C.

2020 ◽  
Vol 12 (43) ◽  
pp. 48476-48485
Shangzhi Xie ◽  
Qiuju Qin ◽  
Hao Liu ◽  
Lijian Jin ◽  
Xiaoling Wei ◽  

2020 ◽  
Vol 94 ◽  
pp. 32-39
Xiaoyan Shi ◽  
Yingjie Wang ◽  
Yulong Shan ◽  
Yunbo Yu ◽  
Hong He

2016 ◽  
Vol 6 (20) ◽  
pp. 7532-7548 ◽  
Wentao Mu ◽  
Jing Zhu ◽  
Shen Zhang ◽  
Yuyu Guo ◽  
Liqing Su ◽  

Most outstanding activities achieved over 15Fe–Mn/ZSM-5 catalyst on account of synergistic effects between RMETB and DMETB.

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