Evaluation of Fe, Mn promoted sulfated zirconia catalyst by x-ray and infrared spectroscopies
- Univ. of Virginia, Charlottesville, VA (United States)
Sulfated zirconia promoted with Fe and Mn is two orders of magnitude more active than an unpromoted catalyst for butane isomerization at low temperature. In this work, the atomic structures of the unpromoted and promoted superacid catalysts were investigated using x-ray absorption spectroscopy at the Zr and Fe K-edges. In addition, infrared spectroscopy was used to probe the structure of the surface sulfate groups on the superacids. Infrared spectroscopy of adsorbed pyridine and carbon monoxide was also used to determine the types and strengths of acid sites on the two samples. Results indicated that Fe atoms do not substitute into tetragonal zirconia and that both Bronsted and Lewis acid sites were present on the materials. Furthermore, no obvious difference in acid strength was observed. Implications of these results for catalysis by zirconia-based superacids will be discussed.
- OSTI ID:
- 126279
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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