In-situ DRIFT assessment on strengthening effect of cerium over FeOx/TiO2 catalyst for selective catalytic reduction of NOx with NH3
来源期刊:JOURNAL OF RARE EARTHS2021年第5期
论文作者:Hossein Chitsazi Ningqiang Zhang Lingcong Li Xiaojun Liu Rui Wu Junda He Liyun Song Hong He
文章页码:526 - 531
摘 要:Fe-based catalysts have a great potential to be used for selective catalytic reduction(SCR) of NOx with NH3 reaction due to their low cost,nontoxicity and excellent catalytic activity.The aim of this paper is to investigate Ce doping effect on activity of NH3-SCR over the FeOx/TiO2 catalyst.In-situ diffuse reflectance infrared fourier transform(DRIFT) technology was utilized to verity the adsorbed species on the surface of FeOx/TiO2 and FeOx-CeO2/TiO2 catalysts.With respect to the obtained results,among the four catalysts studied,the FeOx-CeO2/TiO2 with the FeOx/CeO2 ratio of 3/8 shows the best NO conversion more than 98%in the temperature range of 230—350℃,The active centers for NH3 adsorption and activation are assigned to Lewis acid sites over the FeOx-CeO2/TiO2 and monodentate nitrates can act as the key intermediate in the NH3-SCR.Moreover,both of Langmuir-Hinshelwood and Eley-Rideal mechanisms are observed over the FeOx-CeO2/TiO2 catalysts in the SCR.
Hossein Chitsazi1,Ningqiang Zhang1,Lingcong Li1,Xiaojun Liu2,Rui Wu1,Junda He1,Liyun Song1,Hong He1,3
1. Beijing Key Laboratory for Green Catalysis and Separation and Key Laboratory of Beijing on Regional Air Pollution Control,Beijing University of Technology2. College of Chemistry,Chemical Engineering and Materials Science,Institute of Molecular and Nano Science,Shandong Normal University3. Collaborative Innovation Center of Electric Vehicle in Beijing
摘 要:Fe-based catalysts have a great potential to be used for selective catalytic reduction(SCR) of NOx with NH3 reaction due to their low cost,nontoxicity and excellent catalytic activity.The aim of this paper is to investigate Ce doping effect on activity of NH3-SCR over the FeOx/TiO2 catalyst.In-situ diffuse reflectance infrared fourier transform(DRIFT) technology was utilized to verity the adsorbed species on the surface of FeOx/TiO2 and FeOx-CeO2/TiO2 catalysts.With respect to the obtained results,among the four catalysts studied,the FeOx-CeO2/TiO2 with the FeOx/CeO2 ratio of 3/8 shows the best NO conversion more than 98%in the temperature range of 230—350℃,The active centers for NH3 adsorption and activation are assigned to Lewis acid sites over the FeOx-CeO2/TiO2 and monodentate nitrates can act as the key intermediate in the NH3-SCR.Moreover,both of Langmuir-Hinshelwood and Eley-Rideal mechanisms are observed over the FeOx-CeO2/TiO2 catalysts in the SCR.
关键词: