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  Rapid Genesis of Active Phase during Calcination of Promoted Sulfated Zirconia Catalysts

Hahn, A. H. P., Jentoft, R. E., Ressler, T., Weinberg, G., Schlögl, R., & Jentoft, F. C. (2005). Rapid Genesis of Active Phase during Calcination of Promoted Sulfated Zirconia Catalysts. Journal of Catalysis, 236, 324-334. doi:10.1016/j.jcat.2005.09.035.

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 Creators:
Hahn, Alexander H. P.1, Author              
Jentoft, Rolf E.1, Author              
Ressler, Thorsten1, Author              
Weinberg, Gisela1, Author              
Schlögl, Robert1, Author              
Jentoft, Friederike C.1, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: promoted sulfated zirconia, iron, manganese, preparation, calcination, butane isomerization, morphology, in situ XRD Project 1: Acid-base & redox properties of promoted sulfated zirconia
 Abstract: Amorphous sulfated zirconium hydroxide was promoted with iron or manganese via the incipient wetness technique, to give 0.5–3.5 weight% promoter in the final catalyst. An exothermic reaction during the calcination temperature ramp (to 823 or 923 K) leads to a rapid overheating (“glow”) of the sample. XRD shows that crystallization starts before and progresses during the overheating. The surface area shrinks during the glow, and its final size (85–120 m2•g-1) and the porosity appear to be largely determined by the glow event. Manganese and iron ions prevent the coalescence of particles and lead to high surface areas. Variation of the batch volume (2.2, 8.4, or 17.1 ml) for calcination produced different catalysts from the same precursor. For both promoters, samples calcined in large batches exhibited the highest surface areas, interconnected mesopores (2.2–3.8 nm), and the highest maximum rate in n-butane isomerization (338 K, 1 kPa n-butane). Long term performance was independent of surface area and morphology. The concentration of the active sites depended on the calcination batch size, indicating that the active phase is formed in kinetically controlled reactions during the rapid overheating. The catalytic and textural properties of sulfated zirconia catalysts can be reproduced through controlling the batch size used for calcination.

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Language(s): eng - English
 Dates: 2005-11-10
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 245298
DOI: 10.1016/j.jcat.2005.09.035
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Title: Journal of Catalysis
  Alternative Title : J. Catal.
Source Genre: Journal
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Pages: - Volume / Issue: 236 Sequence Number: - Start / End Page: 324 - 334 Identifier: -