High efficient removal of HCN over porous CuO/CeO2 micro-nano spheres at lower temperature range

doi:10.1016/j.cjche.2020.08.029

Abstract

Abstract: The porous CeO₂ flowerlike micro-nano spheres based materials were prepared to remove HCN effectively at lower temperature range. The CeO₂ and a serious of porous flowerlike ceria based materials loaded with metal species including Cu, Ag, Ni, Co and Fe were synthesized by hydrothermal method and precipitation method respectively. The physicochemical properties were probed by means of XRD, H₂-TPR, BET, SEM and XPS. The removal ability for 130?mg·m^-3 HCN over CuO/CeO₂ showed the highest activity, the breakthrough time of which was more than 70?min at the condition of 30?℃, 120,000?h^-1 and 5?% (volume) H₂O, owe to a higher relative atomic ratio of oxygen vacancies and O_β, the stronger interaction between metal particle and support, the optimum redox properties. The reaction mechanism was speculated by detecting the reaction products selectivity at different reaction temperature. It was shown that the reaction system for removal of HCN over CuO/CeO₂ catalytic material involved chemisorption, catalytic hydrolysis, catalytic oxidation as well as NH₃-SCR reactions.

Key words: Breakthrough time, Chemisorption, Catalytic hydrolysis, Catalytic oxidation, NH₃-SCR

摘要： The porous CeO₂ flowerlike micro-nano spheres based materials were prepared to remove HCN effectively at lower temperature range. The CeO₂ and a serious of porous flowerlike ceria based materials loaded with metal species including Cu, Ag, Ni, Co and Fe were synthesized by hydrothermal method and precipitation method respectively. The physicochemical properties were probed by means of XRD, H₂-TPR, BET, SEM and XPS. The removal ability for 130?mg·m^-3 HCN over CuO/CeO₂ showed the highest activity, the breakthrough time of which was more than 70?min at the condition of 30?℃, 120,000?h^-1 and 5?% (volume) H₂O, owe to a higher relative atomic ratio of oxygen vacancies and O_β, the stronger interaction between metal particle and support, the optimum redox properties. The reaction mechanism was speculated by detecting the reaction products selectivity at different reaction temperature. It was shown that the reaction system for removal of HCN over CuO/CeO₂ catalytic material involved chemisorption, catalytic hydrolysis, catalytic oxidation as well as NH₃-SCR reactions.

关键词: Breakthrough time, Chemisorption, Catalytic hydrolysis, Catalytic oxidation, NH₃-SCR

Zhihao Yi, Jie Sun, Jigang Li, Tian Zhou, Shouping Wei, Hongjia Xie, Yulin Yang. High efficient removal of HCN over porous CuO/CeO₂ micro-nano spheres at lower temperature range[J]. Chinese Journal of Chemical Engineering, 2021, 38(10): 155-164.

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High efficient removal of HCN over porous CuO/CeO₂ micro-nano spheres at lower temperature range

High efficient removal of HCN over porous CuO/CeO₂ micro-nano spheres at lower temperature range

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