Poisoning Experiments Aimed at Discriminating Active and Less-Active Sites of Silica-Supported Tantalum Hydride for Alkane Metathesis

Type
Article

Authors
Saggio, Guillaume
Taoufik, Mostafa
Basset, Jean-Marie
Thivolle-Cazat, Jean

KAUST Department
Chemical Science Program
KAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division

Online Publication Date
2010-10-04

Print Publication Date
2010-12-10

Date
2010-10-04

Abstract
Only 50% of the silica-supported tantalum hydride sites are active in the metathesis of propane. Indeed, more than 45% of the tantalum hydride can be eliminated by a selective oxygen poisoning of inactive sites with no significant decrease in the global turnover. Conversely, cyclopentane induces no such selective poisoning. Hence, the active tantalum hydride sites that show greater resistance to oxygen poisoning correspond to the νTa-H bands of higher wavenumbers, particularly that at 1860cm-1. These active tantalum hydride sites should correspond to tris- or monohydride species relatively far from silica surface oxygen atoms. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Citation
Saggio, G., Taoufik, M., Basset, J.-M., & Thivolle-Cazat, J. (2010). Poisoning Experiments Aimed at Discriminating Active and Less-Active Sites of Silica-Supported Tantalum Hydride for Alkane Metathesis. ChemCatChem, 2(12), 1594–1598. doi:10.1002/cctc.201000199

Acknowledgements
The authors thank the CNRS, ESCPE-Lyon and the BP Company for financial support.

Publisher
Wiley

Journal
ChemCatChem

DOI
10.1002/cctc.201000199

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