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In situ high energy resolution off-resonant spectroscopy applied to a time-resolved study of single site Ta catalyst during oxidation
Univ Fribourg, Dept Phys, Chemin Musee 3, CH-1700 Fribourg, Switzerland..
Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.;Jan Kochanowski Univ Humanities & Sci, Inst Phys, PL-25406 Kielce, Poland..
Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland..
Univ Fribourg, Dept Phys, Chemin Musee 3, CH-1700 Fribourg, Switzerland..
Vise andre og tillknytning
2017 (engelsk)Inngår i: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 411, s. 63-67Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In the present work high energy resolution off-resonant X-ray spectroscopy (HEROS) was employed at a synchrotron to study a silica supported Ta(V) bisalkyl catalyst activated in hydrogen. The Ta L alpha(1) HEROS spectra were measured during oxidation of the starting complex and the relative species' concentration was successfully retrieved as a function of time using the fingerprint HEROS spectra measured for the unoxidized and the oxidized catalyst. Based on the experimental data and theory-based calculations, it was shown that oxidation of the active Ta catalyst leads to the formation of mono- and di-meric species on the SiO2 surface. The obtained results were compared to those of the previously reported time resolved HEROS study on an inactive silica supported Ta(V) bisalkyl catalyst's concentration evolution during its oxidation Blachucki et al. (2015). The study allowed observation of an immediate transition of the active Ta catalyst from its unoxidized form to the oxidized one. This finding is dissimilar to the result of the study on the inactive Ta catalyst, where the oxidation led through an intermediate step.

sted, utgiver, år, opplag, sider
ELSEVIER SCIENCE BV , 2017. Vol. 411, s. 63-67
Emneord [en]
Synchrotron radiation, Time-resolved high energy resolution off, resonant X-ray spectroscopy, Catalysts
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-356358DOI: 10.1016/j.nimb.2016.11.029ISI: 000415772700012OAI: oai:DiVA.org:uu-356358DiVA, id: diva2:1235278
Konferanse
13th International School and Symposium on Synchrotron Radiation in Natural Science (ISSRNS), 2016, Ustron, POLAND
Tilgjengelig fra: 2018-07-25 Laget: 2018-07-25 Sist oppdatert: 2018-07-25bibliografisk kontrollert

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