Enhancement of the activity of Cu/TiO2 catalyst by Eu modification for selective catalytic reduction of NOx with NH3
2020
Liu, Yuan-zhen | Xu, Qi-yan | Guo, Rui-tang | Duan, Chao-peng | Wu, Gui-lin | Miao, Yufang | Gu, Jing-wen
The Cu/TiO₂ catalysts with the addition of Eu were developed by the sol-gel way for the selective catalytic reduction (SCR) of NOₓ by NH₃. Activity tests revealed that CuEu/TiO₂-0.15 catalyst showed the optimal de-NOₓ performance in a wide temperature range (150–300 °C), along with an admirable SO₂ tolerance. According to characterization analysis, the relationship between the NH₃-SCR performance and physicochemical characters of samples was explored. The adjunction of Eu on Cu/TiO₂ catalyst can contribute to the formation of a large amount of Cu²⁺, adsorbed oxygen, and acid sites on the catalyst surface. Moreover, the Eu addition on Cu/TiO₂ is favorable to the generation of activated NOₓ and NH₃ substances adsorbed on the catalyst surface, which would conduce to the NH₃-SCR process by Langmuir-Hinshelwood (L-H) mechanism effectively.
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