The effect of Fe species distribution and acidity of Fe-ZSM-5 on the hydrothermal stability and SO2 and hydrocarbons durability in NH3-SCR reaction

doi:10.1016/S1872-2067(14)60268-0

Abstract

Abstract:

Fe-exchanged ZSM-5 catalysts prepared from Na⁺ and H⁺ forms of ZSM-5 were evaluated for the selective catalytic reduction of NO_x by NH₃ (NH₃-SCR). Fe-H-ZSM-5 showed higher SCR activity than Fe-Na-ZSM-5 both when fresh and after hydrothermal aging at 750 ℃ in 5% H₂O/air. The Fe species distribution and acidity of Fe-H-ZSM-5 and Fe-Na-ZSM-5 were found to be different. The dealumination of the zeolite framework of Fe-H-ZSM-5 during hydrothermal aging was found to be more severe compared with that of Fe-Na-ZSM-5. The durability of Fe-H-ZSM-5 and Fe-Na-ZSM-5 in NH₃-SCR was compared using SO₂ tolerance and hydrocarbon resistance experiments. The effect of water and SO₂ on the activity of the two catalysts was similar, such that their activity decreased at low temperatures and increased at high temperatures. Fe-Na-ZSM-5 showed better propene resistance than Fe-H-ZSM-5. The SO₂ and propene poisoning of the two Fe-ZSM-5 catalysts were found to be reversible.

Key words: Iron-ZSM-5, Ammonia selective catalytic reduction, Removal of nitrogen oxide, SO₂ durability, Hydrothermal stability

Xiaoyan Shi, Hong He, Lijuan Xie. The effect of Fe species distribution and acidity of Fe-ZSM-5 on the hydrothermal stability and SO₂ and hydrocarbons durability in NH₃-SCR reaction[J]. Chinese Journal of Catalysis, 2015, 36(4): 649-656.

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The effect of Fe species distribution and acidity of Fe-ZSM-5 on the hydrothermal stability and SO₂ and hydrocarbons durability in NH₃-SCR reaction

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