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

ID: 119714.0, Fritz-Haber-Institut / Inorganic Chemistry
Incorporation of Manganese and Iron into the Zirconia Lattice in Promoted Sulfated Zirconia Catalysts
Authors:Jentoft, Friederike C.; Hahn, Alexander H. P.; Kröhnert, Jutta; Lorenz, Gisela; Jentoft, Rolf E.; Ressler, Thorsten; Wild, Ute; Schlögl, Robert; Häßner, Carmen; Köhler, Klaus
Research Context:Project 1: Acid-base & redox properties of promoted sulfated zirconia
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Journal of Catalysis
Journal Abbrev.:J. Catal.
Start Page:124
End Page:137
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Two series of Mn- or Fe-promoted zirconia samples were prepared, (i) a series of sulfated-free reference compounds via co-precipitation of aqueous solutions containing zirconium and the promoter cation, and (ii) a series of catalysts via incipient-wetness impregnation of a sulfated zirconium hydroxide. The promoter content was varied between 0 and 5 wt% metal. All promoter-containing materials were calcined at 923 K. The reference materials contained mainly isolated Mn or Fe species incorporated into the zirconia lattice as evidenced by stabilization of the tetragonal zirconia phase, EPR (isolated ions in highly symmetric environment), and a shrinking unit cell volume (XRD) of the tetragonal zirconia phase with increasing promoter content. Only the Mn-promoted catalysts showed such shrinkage in unit cell volume with increasing promoter content. At 2 wt% promoter content, Fe could, and Mn could not be detected by ion scattering spectroscopy on the surface of the catalysts. The Fe-promoted catalysts contained Fe2O3–like surface species (EPR, XANES), which could at least in part be removed by washing with oxalic acid. Catalysts were tested for isomerization at 338 K using 1 kPa n-butane in balance of N2. At 0.5 wt% promoter content the maximum rates produced by the 0.5 wt% Mn-promoted and Fe-promoted sulfated zirconia were about 80 and 20 µmol g-1 h-1, respectively. Mn was thus more effective as a promoter for n-butane isomerization than Fe, despite the more extensive incorporation into the zirconia lattice.
Last Change of the Resource (YYYY-MM-DD):2004-03-25
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Functional Characterization
Fritz-Haber-Institut/Inorganic Chemistry/Geometric Structure
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
Fritz-Haber-Institut/Inorganic Chemistry/Surface Analysis
External Affiliations:Anorganisch-Chemisches Institut, Technische Universität München,
Lichtenbergstr. 4, 85747 Garching, Germany
Identifiers:URL: [only for subscriber]
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