FT-IR spectroscopic investigation of the effect of SO2 on the SCR of NOx with propene over ZrO2–Nb2O5 catalyst
Date
2011-11-01Source Title
Catalysis Today
Print ISSN
0920-5861
Electronic ISSN
1873-4308
Publisher
Elsevier
Volume
176
Issue
1
Pages
437 - 440
Language
English
Type
ArticleItem Usage Stats
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Abstract
The SO2 tolerance of a catalyst based on ZrO2–Nb2O5 solid solution (mole ratio ZrO2:Nb2O5 = 1:6) in
the catalytic activity for NOx reduction with propene in excess oxygen has been studied. No loss in the
C3H6-SCR activity was observed for 2 h after the addition of 56 ppm of SO2 to the reaction mixture.
When the concentration of SO2 has been increased to 200 ppm (the so-called fast poisoning experiment)
the activity of the catalyst decreased by 13% and remained unchanged for more than 5 h under these
conditions. The effect of SO2 on the surface reaction of the SCR reactants has been investigated by in situ
FT-IR spectroscopy and mechanism for the suppression of the catalytic activity at high concentration of
the poison has been proposed.
Keywords
Zro2-nb2o5 Solid SolutionC3h6-scr Of Nox
Effect Of So2
In Situ Ft-ir Spectroscopy
Mechanism Of So2 Poisoning