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



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ID: 434765.0, Fritz-Haber-Institut / Inorganic Chemistry
Characterization of catalysts in their active state by adsorption microcalorimetry: Experimental design and application to sulfated zirconia
Authors:Wrabetz, Sabine; Yang, Xiaobo; Tzolova-Müller, Genka; Schlögl, Robert; Jentoft, Friederike C.
Language:English
Research Context:Acid-base & redox properties of promoted sulfated zirconia
Date of Publication (YYYY-MM-DD):2010-02-05
Title of Journal:Journal of Catalysis
Journal Abbrev.:J. Catal.
Volume:269
Issue / Number:2
Start Page:351
End Page:358
Copyright:© 2009 Elsevier Inc. All rights reserved.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:A method to characterize the surface sites of catalysts in their active state by adsorption microcalorimetry was developed. A calorimeter cell was used as a flow-type reactor, and the skeletal isomerization of n-butane (1 kPa) at 378 K and atmospheric pressure proceeded at comparable rates and with the same states of induction period, maximum and deactivation phase as in a tubular reactor. The reaction was run for selected times on stream and after removal of weakly adsorbed species, n-butane or isobutane were adsorbed at 313 K. The surface of activated sulfated zirconia was characterized by at least two different sites for n-butane adsorption, a small group of sites (about 20 µmol g-1) that yielded heats of 5060 kJ mol-1 and sites that were populated at higher pressures (above about 5 hPa n-butane) and yielded heats of about 40 kJ mol-1. The strongly interacting sites disappear during the induction period and are proposed to be the sites where the isomerization reaction is initiated.
Free Keywords:sulfated zirconia; isomerization; microcalorimetry; n-butane; isobutane; adsorption isotherm
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Electronic Structure and Adsorption / Metals
Fritz-Haber-Institut/Inorganic Chemistry/Reactivity / Oxides
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
External Affiliations:Chemical, Biological & Materials Engineering, University of Oklahoma, Norman/USA
Identifiers:URL:http://dx.doi.org/10.1016/j.jcat.2009.11.018 [only for subscriber]
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