Abstract
Identification of highly active iron sites in N2O-activated Fe/MFI was analyzed. Reduction in an H2 flow at 600°C of Fe/MFI prepared by chemical vapor deposition and followed by its exposure to N2O at 250°C produced a highly active state characterized by an unusual TPR spike at 200°C. In situ X-ray absorption near-edge structure, X-ray absorption fine structure data and literature data on density functional theory (DFT) calculations suggested that in this state some Fe will be present in the oxidation state of Fe4+.
Original language | English (US) |
---|---|
Pages (from-to) | 7-11 |
Number of pages | 5 |
Journal | Catalysis Letters |
Volume | 82 |
Issue number | 1-2 |
DOIs | |
State | Published - Sep 2002 |
Funding
This work was supported by the EMSI program of the National Science Foundation and the U.S. Department of Energy, OCce of Science (CHE-9810378) at the Northwestern University Institute for Environmental Catalysis (IEC). Support from the Director of the Chemistry Division, BES, U.S. Department of Energy, Grant DE-FGO2-87ER13654, is gratefully acknowledged. IEC work at Argonne National Laboratory is supported by the U.S. Department of Energy, OCce of Basic Energy Sciences, Division of Chemical Sciences, under contract W -31-109-Eng-38. The authors thank Dr. Tao Liu for his help in data collection and Dr. Jennifer Linton for her assistance in beam line operation at the BESSRC-CAT, Advanced Photon Source.
Keywords
- Fe in MFI
- In situ
- NO dissociation
- Oxidation state >3 of Fe
- XAFS
- XANES
- α-sites
ASJC Scopus subject areas
- Catalysis
- General Chemistry