Fe ion-exchanged zeolite catalysts (Fe-BEA, Fe-MFI) were found to be active for selective catalytic reduction (SCR) of N2O with light alkanes (i.e., CH4 and C2H6) even in the presence of excess oxygen. In the N2O/C2H6/O2 system over Fe-BEA catalyst, N2O plays an important role in the oxidation of C2H6 (i.e., activation of C2H6 at an initial step). H2-TPR and catalytic measurements of Fe-BEA catalysts with different Fe contents revealed that the active sites for SCR of N2O with CH4 and N2O decomposition are Fe ion species, and Fe oxide aggregates are inactive. In O2-TPD studies, we observed new desorption peaks from Fe-BEA catalyst after N2O treatment. In the isotopic tracer study of N2O decomposition, the result shows that O2 formation on Fe-MFI catalyst proceeds via Eley-Rideal mechanism, which is different from the case of supported Rh catalysts.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry