Infrared study of pyridine adsorbed on unpromoted and promoted sulfated zirconia
- Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research
- Engelhard Corp., Beachwood, OH (United States)
- Ashland Petroleum Co., KY (United States)
Infrared spectra of pyridine adsorbed on zirconia and Pt-zirconia exhibited bands consistent with Lewis acid sites. Sulfated zirconia, after heating at 400 C, exhibited bands indicating about equal amounts of Lewis (L) and Broensted (B) acid sites; the B/L ratio decreased with increasing reactivation temperature to become essentially zero after reactivation at 600 C. In contrast, both Pt and Fe/Mn promoted sulfated zirconia exhibited B/L ratios that increased slightly with increasing reactivation temperature. It is proposed that pyridine reacts with a Lewis acid site to produce an adsorbed pyridone-type surface species with the concurrent generation of a proton. The superior performance of the promoted sulfated zirconia catalyst is believed to arise from its ability to generate Broensted acid sites.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-90PC90049
- OSTI ID:
- 350247
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 183; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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