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Erschienen in: Topics in Catalysis 6-9/2014

01.04.2014 | Original Paper

Combined Zr and S XANES Analysis on S–ZrO2/MWCNT Solid Acid Catalyst

verfasst von: Changchang Liu, Trudy Bolin, Paul Northrup, Sungchul Lee, Charles McEnally, Patrick Kelleher, Lisa Pfefferle, Gary L. Haller

Erschienen in: Topics in Catalysis | Ausgabe 6-9/2014

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Abstract

Sulfated zirconia (S–ZrO2) is a versatile solid acid catalyst that has wide application in hydrocarbon conversion reactions. In our previous work, we have developed well-dispersed ZrO2 nanoparticles supported on multi-walled carbon nanotubes (MWCNT) to form a ZrO2/MWCNT composite, which, upon sulfation, becomes a S–ZrO2/MWCNT solid acid catalyst. While X-ray absorption spectroscopy (XAS) of this composite at the C, O, Zr K-edges has been well studied in our previous reports, XAS at the S K-edge is complicated by the Zr L-edges that bracket the S K-edge. In this study, we have used conventional S XANES, together with first-derivative and third-derivative analysis, to probe the sulfur species formed during the catalyst preparation and their interaction with Zr. We have also designed combined Zr and S XANES, which spans 400 eV and covers all three Zr L-edges and the S K-edge, to study the Zr and S interaction. Such use of multiple-edge XANES to study the S–ZrO2 system at low X-ray energy (2,200–2,600 eV) was first reported in the previous publication of our research group, and in this paper we elaborate on the comprehensive study of our catalyst system using this method.

Graphical Abstract

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Metadaten
Titel
Combined Zr and S XANES Analysis on S–ZrO2/MWCNT Solid Acid Catalyst
verfasst von
Changchang Liu
Trudy Bolin
Paul Northrup
Sungchul Lee
Charles McEnally
Patrick Kelleher
Lisa Pfefferle
Gary L. Haller
Publikationsdatum
01.04.2014
Verlag
Springer US
Erschienen in
Topics in Catalysis / Ausgabe 6-9/2014
Print ISSN: 1022-5528
Elektronische ISSN: 1572-9028
DOI
https://doi.org/10.1007/s11244-013-0226-8

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