Sol-gel synthesis and catalytic properties of sulfated zirconia
- Tulane Univ., New Orleans, LA (United States)
Sulfate zirconia catalysts were prepared using a two-step sol-gel method with zirconium n-propoxide as the alcoxide precursor and a water/alcoxide ratio of 40. The resulting xerogel was pretreated prior to sulfation in flowing He at 385{degrees}C for 3 hours. The sulfation step was performed by immersing the dried xerogel in 15 ml of H{sub 2}SO{sub 4} solution per gram of sample for 15 min followed by drying in an oven at 130{degrees}C for 16 hours. The sulfated zirconia was activated in flowing oxygen at 600{degrees}C for 1 hour. A thermal desorption study of the deactivated catalyst showed two SO{sub 2} (m/e=64) peaks at 600{degrees}C and 900{degrees}C. The SO{sub 2} desorption peak at 600{degrees}C was coincidental with a CO{sub 2} (m/e=44) peak at the same temperature. These results are interpreted in terms of an organo-sulfur complex on the surface of the deactivated catalyst.
- OSTI ID:
- 370518
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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