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Poisoning Effect of SO2 on NO Reduction by i-Butane over Fe/ZSM-5 Prepared by Sublimation Method

Journal of Catalysis
Publication Date
DOI: 10.1006/jcat.2001.3346
  • Selective Catalytic Reduction
  • Fe/Zsm-5
  • So2
  • Electron Paramagnetic Resonance
  • Infrared
  • X-Ray Photoelectron Spectroscopy
  • Temperature-Programmed Desorption
  • Sublimation
  • Physics


Abstract X-ray photoelectron spectroscopy (XPS) in situ electron paramagnetic resonance (EPR), in situ Fourier transform infrared spectroscopy (FT-IR), SO2 temperature-programmed desorption (TPD), and reaction tests were performed to investigate the poisoning effect on the selective catalytic reaction of NO by i-butane over Fe/ZSM-5. Kinetic studies at 623 K, showed that the presence of SO2 in the reaction mixture poisoned Fe/ZSM-5 irreversibly. XPS studies of Fe/ZSM-5 after reaction with SO2 at 623 K revealed the formation of sulfate species, which corresponds well to the SO2 TPD result. in situ EPR spectra showed that the lines arising from the distorted tetrahedral Fe3+ ions at g≈5.8 and 6.5, which were known to be reactive species, disappeared and a new and sharp one at g≈1.9978 assigned to paramagnetic coke species appeared. The preadsorption of SO2 suppressed the formation of the IR bands arising from Fe–NO2 (1623 cm−1) and Fe–NO3 (1573 cm−1). On the basis of these results, SO2 deactivated Fe/ZSM-5 by suppressing the formation of Fe–NOy (y=2, 3) complexes and promoting the formation of carbonaceous deposits, which resulted in consumption of the active Fe3+ sites.

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