Infrared spectroscopic study of surface species and of CO adsorption: a probe for the surface characterization of sulfated zirconia catalysts
| Autor: | Claudio Morterra, Francesco Pinna, Giuseppina Cerrato |
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| Rok vydání: | 1998 |
| Předmět: |
Sulfated Zirconia Catalyst
Chemistry Infrared Inorganic chemistry Infrared spectroscopy Thermal activation Atomic and Molecular Physics and Optics Analytical Chemistry law.invention Catalysis Adsorption law CO adsorption Calcination Cubic zirconia Lewis acids and bases Instrumentation Isomerization Spectroscopy |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 55:95-107 |
| ISSN: | 1386-1425 |
| DOI: | 10.1016/s1386-1425(98)00170-x |
| Popis: | IR spectra of surface species and of CO adsorption at ∼77 and ∼300 K on pure ZrO2, sulfated ZrO2, sulfated/calcined ZrO2 have been obtained and related to the catalytic activity of these systems in the isomerization of n-butane. Spectral data indicated that: (i) the catalytic activity, when present, requires the presence of both Bronsted and Lewis surface acidity; (ii) a catalyst calcination step is necessary for the elimination of sulfates from crystal defects, on which strong Lewis acid sites must form; (iii) strong Lewis acid sites actually involved in the catalytic process represent a small yet strongest fraction of all Lewis sites formed on the catalyst upon thermal activation. |
| Databáze: | OpenAIRE |
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