Role of aggregated Fe oxo species in N2O decomposition over Fe/ZSM-5

doi:10.1016/S1872-2067(14)60184-4

Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (12): 1972-1981.DOI: 10.1016/S1872-2067(14)60184-4

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Role of aggregated Fe oxo species in N₂O decomposition over Fe/ZSM-5

Bo Zhang, Fudong Liu, Hong He, Li Xue

Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

Received:2014-05-14 Revised:2014-06-27 Online:2014-11-29 Published:2014-11-29
Supported by:
This work was supported by the National High Technology Research and Development Program of China (863 Program, 2013AA065301), the National Basic Research Program of China (973 Program, 2010CB732304), and the National Natural Science Found for Creative Research Groups of China (51221892).

Abstract

Abstract:

The effects of aggregated Fe oxo (FeO_x) species on N₂O decomposition activity of aqueous ion-exchanged Fe/ZSM-5 were investigated. Aggregation of FeO_x species was achieved by thermal treatment of the Fe/ZSM-5 catalysts at different temperatures (600-900 ℃) in pure Ar. The characterizations were carried out using X-ray diffraction, N₂ physisorption, UV-Vis diffuse reflectance spectroscopy, X-ray absorption fine structure spectroscopy, pulse-response analysis, and O₂-temperature-programmed desorption. The FeO_x species on the external framework of the ZMS-5 zeolite played a dominant role in N₂O decomposition over Fe/ZSM-5. By studying the relationship between the contents of the various existing iron species and activity of the different catalysts, polynuclear FeO_x appeared to be the main active phase for N₂O decomposition. Additionally, Fe-O with a long bond length ((Fe-O)₂) in amorphous polynuclear FeO_x was positively correlated to the activity of the catalysts, indicating that (Fe-O)₂ was the active species for N₂O decomposition.

Key words: N₂O decomposition, Fe/ZSM-5, Iron species, Thermal treatment

Bo Zhang, Fudong Liu, Hong He, Li Xue. Role of aggregated Fe oxo species in N₂O decomposition over Fe/ZSM-5[J]. Chinese Journal of Catalysis, 2014, 35(12): 1972-1981.

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Role of aggregated Fe oxo species in N₂O decomposition over Fe/ZSM-5

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