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Hydrothermal stability of Fe-ZSM-5 and Fe-BEA prepared by wet ion-exchange for N2O decomposition
- Source :
-
Applied Catalysis B: Environmental . Feb2007, Vol. 71 Issue 1/2, p16-22. 7p. - Publication Year :
- 2007
-
Abstract
- Abstract: The hydrothermal stability of WIE-based Fe-ZSM-5 and Fe-BEA for N2O decomposition in the presence of NO, H2O and O2 was studied at 723K. Catalysts were characterized with UV–vis, IR and Al-XANES. The N2O conversion remains at a constant level with Fe–H-BEA even in the presence of large amounts of H2O. Deactivation was, however, observed with Fe–H-ZSM-5 already in the presence of 0.5vol.% water. The analysis of deactivated samples indicated that steam-dealumination and clustering of iron occurred during the reaction with Fe-ZSM-5. Replacement of protons for sodium in Fe-ZSM-5 slowed down the rate of catalyst deactivation significantly. Steam-dealumination is likely to precede the clustering of iron in Fe–H-ZSM-5. The excellent hydrothermal stability of WIE-based Fe–H-BEA relates to the high initial degree of dealumination in the as-received BEA. [Copyright &y& Elsevier]
- Subjects :
- *CATALYSTS
*NITRIC oxide
*PROTONS
*CATALYST poisoning
*IRON
Subjects
Details
- Language :
- English
- ISSN :
- 09263373
- Volume :
- 71
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Applied Catalysis B: Environmental
- Publication Type :
- Academic Journal
- Accession number :
- 23671370
- Full Text :
- https://doi.org/10.1016/j.apcatb.2006.08.011