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Improvement of the catalytic isomerization performance for sulfated zirconias by use of templating techniques

Paper ID Volume ID Publish Year Pages File Format Full-Text
43166 45957 2009 8 PDF Available
Title
Improvement of the catalytic isomerization performance for sulfated zirconias by use of templating techniques
Abstract

New sulfated zirconias covering a wide range of pore diameters from micropores to macropores have been prepared by a combined use of two different structure-directing templates. The catalytic performance of these sulfated zirconias for the n-butane isomerization could be improved significantly compared to a standard displaying a maximum rate of isomerization of 1490 μmol/g h at 423 K. The materials remained their high activity even at 348 K. Moreover, deactivated materials could be reactivated to the original activity in an air-flow at 673 K several times. The newly designed materials were fully characterized by XRD, XPS, TPD of ammonia, IR spectroscopy and N2 adsorption to describe the formation of active surface centres and their morphology. The formation of active pyrosulfates with sulfate bands above 1400 cm−1 was followed by DRIFTS. An increased ratio of Brønsted-to-Lewis centres could be detected which can be accounted for the unexpected high activity.

Graphical abstractThe n-butane isomerization over sulfated zirconias was investigated for newly designed nanostructured materials derived by a template assisted route which diplay an improved conversion to iso-butane close to the thermodynamic limits at 423 K.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Sulfated zirconia; Template assisted synthesis; Porous materials; n-Butane isomerization; XPS; Brønsted sites; DRIFTS
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Improvement of the catalytic isomerization performance for sulfated zirconias by use of templating techniques
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 352, Issues 1–2, 15 January 2009, Pages 171–178
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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