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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents

ID: 276334.0, Fritz-Haber-Institut / Inorganic Chemistry
In Situ Diffuse Reflectance IR Spectroscopic Investigation of
n-Butane Isomerization on Promoted Sulfated Zirconia Catalysts
Authors:Klose, Barbara S.; Jentoft, Friederike C.; Schlögl, Robert
Research Context:Project 1, Acid-base & redox properties of promoted sulfated zirconia
Name of Conference/Meeting:5th International Symposium On Acid Base Catalysis
Place of Conference/Meeting:Puerto Vallarta, Mexico
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Audience:Experts Only
Abstract / Description:Introduction
Sulfated zirconia (SZ) is an attractive catalyst for low temperature butane isomerization [1]. Its activity can be improved by 1–2 orders of magnitude through addition of promoters such as iron or manganese in cationic form [2,3]. The state of these promoters has been characterized, and depending on the method of preparation, a major fraction is found to form a solid solution with zirconia [4]. It has been proposed that promoters facilitate reaction initiation via oxidative dehydrogenation to butenes, which may be converted into the reaction carriers, viz. carbenium ions. Only indirect evidence such as better activity after activation in oxidizing than in inert atmosphere has been presented [5]. Reaction profiles recorded under moderate reaction conditions (e.g. 323 K, 1 kPa n-butane) show an induction period and zero conversion in the extrapolation to zero time on stream. Either the catalyst becomes active only in the feed, or intermediates accumulate on the surface. We have focused on manganese as a promoter and have used in situ diffuse reflectance IR spectroscopy (DRIFTS) to reveal the effects of activation or regeneration in inert gas or O2, and to monitor the events during the induction period.
1. Hino, M., Arata, K., J. Am. Chem. Soc. 101, 6439 (1979).
2. Hsu, C.-Y., Heimbuch, C.R., Armes, C.T., Gates, B.C., Chem. Commun. 1645 (1992).
3. Lange, F.C., Cheung, T.-K., Gates, B.C., Catal. Lett. 41, 95 (1996).
4. Jentoft, F.C., Hahn, A., Kröhnert, J., Lorenz, G., Jentoft, R.E., Ressler, T., Wild, U., Schlögl, R., J. Catal. 224, 124 (2004).
5. Wan, K.T., Khouw, C.B., Davis, M.E., J. Catal. 158, 311 (1996).
Free Keywords:in situ, Isomerisation
Last Change of the Resource (YYYY-MM-DD):2005-06-27
Document Type:Talk at Event
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Functional Characterization
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
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