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

ID: 204769.0, Fritz-Haber-Institut / Inorganic Chemistry
Deactivation and Regeneration of Mn-Promoted Sulfated Zirconia Alkane Isomerization Catalysts: An In-Situ Spectroscopic Study
Authors:Klose, Barbara S.; Jentoft, Rolf E.; Ressler, Thorsten; Joshi, Pradnya; Trunschke, Annette; Schlögl, Robert; Jentoft, Friederike C.
Research Context:Project 1: Acid-base & redox properties of promoted sulfated zirconia
Name of Conference/Meeting:DGMK International Conference C4/C5-Hydrocarbons: Routes to higher value-added products
Place of Conference/Meeting:Munich/Germany
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
 Invitation status:contributed
Audience:Experts Only
Abstract / Description:Abstract
Mn-promoted sulfated zirconia (0.5 or 2 wt% Mn) was investigated during activation (in inert or oxidizing atmosphere at 703–773 K), during n-butane isomerization (323–333 K, 1 kPa n-butane) and during regeneration (see activation conditions) using in situ UV–vis–NIR, diffuse reflectance IR, and X-ray absorption spectroscopies. While the activation atmosphere did not influence the degree of hydration and the state of the sulfate, manganese—which was always present as a mixture of Mn2+ and higher oxidation states—was slightly reduced in the absence of oxygen. Catalytic data did not give a clear picture as to whether activation in oxygen-containing atmosphere is advantageous or not. The catalysts deactivated within hours, but complete recovery in O2 was possible. Heating of a deactivated catalyst in N2 produced an inactive material and unsaturated compounds on the surface.
Free Keywords:low temperature alkane isomerization, deactivation, sulfated zirconia, manganese, in situ, diffuse reflectance, IR, UV–vis–NIR spectroscopy, XAFS, n butane
Last Change of the Resource (YYYY-MM-DD):2004-10-12
Document Type:Talk at Event
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Functional Characterization
Fritz-Haber-Institut/Inorganic Chemistry/Geometric Structure
Fritz-Haber-Institut/Inorganic Chemistry/Preparation
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
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