Study of M-ZSM-5 nanocatalysts (M: Cu, Mn, Fe, Co …) for selective catalytic reduction of NO with NH3: Process optimization by Taguchi method

doi:10.1016/j.cjche.2015.08.003

Abstract

Abstract: A series of different transition metals (V, Co, Cr, Mn, Fe, Ni, Cu and Zn) promoted H-ZSM-5 catalysts were prepared by impregnation method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The catalytic activity of these catalysts was evaluated for the selective catalytic reduction (SCR) of NO with NH₃ as reductant in the presence of oxygen. The results revealed that the catalytic activity of Cu-ZSM-5 nanocatalyst for NO conversion to N₂ was 80% at 300 ℃, which was the best among various promoted metals. Design of experiments (DOEs) with Taguchi method was employed to optimize NH₃-SCR process parameters such as NH₃/NO ratio, O₂ concentration, and gas hourly space velocity (GHSV) over Cu-ZSM-5 nanocatalyst at 250 and 300 ℃. Results showed that the most important parameter in NH₃-SCR of NO is O₂ concentration; followed by NH₃/NO ratio and GHSV has little importance. The NO conversion to N₂ of 63.1% and 94.86%was observed at 250 ℃ and 300 ℃, respectively under the obtained optimum conditions.

Key words: NO, SCR, ZSM-5, Transition metal, Taguchi method

摘要： A series of different transition metals (V, Co, Cr, Mn, Fe, Ni, Cu and Zn) promoted H-ZSM-5 catalysts were prepared by impregnation method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The catalytic activity of these catalysts was evaluated for the selective catalytic reduction (SCR) of NO with NH₃ as reductant in the presence of oxygen. The results revealed that the catalytic activity of Cu-ZSM-5 nanocatalyst for NO conversion to N₂ was 80% at 300 ℃, which was the best among various promoted metals. Design of experiments (DOEs) with Taguchi method was employed to optimize NH₃-SCR process parameters such as NH₃/NO ratio, O₂ concentration, and gas hourly space velocity (GHSV) over Cu-ZSM-5 nanocatalyst at 250 and 300 ℃. Results showed that the most important parameter in NH₃-SCR of NO is O₂ concentration; followed by NH₃/NO ratio and GHSV has little importance. The NO conversion to N₂ of 63.1% and 94.86%was observed at 250 ℃ and 300 ℃, respectively under the obtained optimum conditions.

关键词: NO, SCR, ZSM-5, Transition metal, Taguchi method

Parvaneh Nakhostin Panahi, Darush Salari, Aligholi Niaei, Seyed Mahdi Mousavi. Study of M-ZSM-5 nanocatalysts (M: Cu, Mn, Fe, Co …) for selective catalytic reduction of NO with NH₃: Process optimization by Taguchi method[J]. Chin.J.Chem.Eng., 2015, 23(10): 1647-1654.

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Study of M-ZSM-5 nanocatalysts (M: Cu, Mn, Fe, Co …) for selective catalytic reduction of NO with NH₃: Process optimization by Taguchi method

Study of M-ZSM-5 nanocatalysts (M: Cu, Mn, Fe, Co …) for selective catalytic reduction of NO with NH₃: Process optimization by Taguchi method

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