Reactivity of Cr species grafted on SiO2/Si(100) surface: a Reflection EXAFS study down to the sub-monolayer regime

G. Agostini; E. Groppo; S. Bordiga; A. Zeccina; C. Prestipino; F. D'Acapito; E.M.E. Kimmenade, van; P.C. Thune; J.W. Niemantsverdriet; C. Lamberti

doi:10.1021/jp074066t

Reactivity of Cr species grafted on SiO2/Si(100) surface: a Reflection EXAFS study down to the sub-monolayer regime

G. Agostini, E. Groppo, S. Bordiga, A. Zeccina, C. Prestipino, F. D'Acapito, E.M.E. Kimmenade, van, P.C. Thune, J.W. Niemantsverdriet, C. Lamberti

Inorganic Materials & Catalysis

Research output: Contribution to journal › Article › Academic › peer-review

25 Citations (Scopus)

Abstract

In situ X-ray absorption near-edge spectroscopy/extended X-ray absorption fine structure (XANES/EXAFS) experiments are conducted for the first time on a highly diluted Cr/SiO2/Si(100) system (2 Cr/nm2, representing a model of the Phillips catalyst for the ethylene polymerization) by exploiting the reflection EXAFS (ReflEXAFS) geometry. This experiment, aimed to give a contribution in bridging the gap between surface science and catalysis, demonstrates that it is possible to follow the reversible red-ox reactivity of surface species grafted on a single well-defined surface, at a concentration limit that is far below the monolayer coverage level and for a highly sensitive sample. A further improvement on the impurity level of the ReflEXAFS chamber is however required in order to be able to follow in situ the polymerization reaction. Our results demonstrate that the red-ox ability of the isolated surface Cr species is not enough to make a polymerization active species.

Original language	English
Pages (from-to)	16437-16444
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	44
DOIs	https://doi.org/10.1021/jp074066t
Publication status	Published - 2007

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Agostini, G., Groppo, E., Bordiga, S., Zeccina, A., Prestipino, C., D'Acapito, F., Kimmenade, van, E. M. E., Thune, P. C., Niemantsverdriet, J. W., & Lamberti, C. (2007). Reactivity of Cr species grafted on SiO2/Si(100) surface: a Reflection EXAFS study down to the sub-monolayer regime. Journal of Physical Chemistry C, 111(44), 16437-16444. https://doi.org/10.1021/jp074066t

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title = "Reactivity of Cr species grafted on SiO2/Si(100) surface: a Reflection EXAFS study down to the sub-monolayer regime",

abstract = "In situ X-ray absorption near-edge spectroscopy/extended X-ray absorption fine structure (XANES/EXAFS) experiments are conducted for the first time on a highly diluted Cr/SiO2/Si(100) system (2 Cr/nm2, representing a model of the Phillips catalyst for the ethylene polymerization) by exploiting the reflection EXAFS (ReflEXAFS) geometry. This experiment, aimed to give a contribution in bridging the gap between surface science and catalysis, demonstrates that it is possible to follow the reversible red-ox reactivity of surface species grafted on a single well-defined surface, at a concentration limit that is far below the monolayer coverage level and for a highly sensitive sample. A further improvement on the impurity level of the ReflEXAFS chamber is however required in order to be able to follow in situ the polymerization reaction. Our results demonstrate that the red-ox ability of the isolated surface Cr species is not enough to make a polymerization active species.",

author = "G. Agostini and E. Groppo and S. Bordiga and A. Zeccina and C. Prestipino and F. D'Acapito and {Kimmenade, van}, E.M.E. and P.C. Thune and J.W. Niemantsverdriet and C. Lamberti",

year = "2007",

doi = "10.1021/jp074066t",

language = "English",

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Agostini, G, Groppo, E, Bordiga, S, Zeccina, A, Prestipino, C, D'Acapito, F, Kimmenade, van, EME, Thune, PC, Niemantsverdriet, JW & Lamberti, C 2007, 'Reactivity of Cr species grafted on SiO2/Si(100) surface: a Reflection EXAFS study down to the sub-monolayer regime', Journal of Physical Chemistry C, vol. 111, no. 44, pp. 16437-16444. https://doi.org/10.1021/jp074066t

TY - JOUR

T1 - Reactivity of Cr species grafted on SiO2/Si(100) surface: a Reflection EXAFS study down to the sub-monolayer regime

AU - Agostini, G.

AU - Groppo, E.

AU - Bordiga, S.

AU - Zeccina, A.

AU - Prestipino, C.

AU - D'Acapito, F.

AU - Kimmenade, van, E.M.E.

AU - Thune, P.C.

AU - Niemantsverdriet, J.W.

AU - Lamberti, C.

PY - 2007

Y1 - 2007

N2 - In situ X-ray absorption near-edge spectroscopy/extended X-ray absorption fine structure (XANES/EXAFS) experiments are conducted for the first time on a highly diluted Cr/SiO2/Si(100) system (2 Cr/nm2, representing a model of the Phillips catalyst for the ethylene polymerization) by exploiting the reflection EXAFS (ReflEXAFS) geometry. This experiment, aimed to give a contribution in bridging the gap between surface science and catalysis, demonstrates that it is possible to follow the reversible red-ox reactivity of surface species grafted on a single well-defined surface, at a concentration limit that is far below the monolayer coverage level and for a highly sensitive sample. A further improvement on the impurity level of the ReflEXAFS chamber is however required in order to be able to follow in situ the polymerization reaction. Our results demonstrate that the red-ox ability of the isolated surface Cr species is not enough to make a polymerization active species.

AB - In situ X-ray absorption near-edge spectroscopy/extended X-ray absorption fine structure (XANES/EXAFS) experiments are conducted for the first time on a highly diluted Cr/SiO2/Si(100) system (2 Cr/nm2, representing a model of the Phillips catalyst for the ethylene polymerization) by exploiting the reflection EXAFS (ReflEXAFS) geometry. This experiment, aimed to give a contribution in bridging the gap between surface science and catalysis, demonstrates that it is possible to follow the reversible red-ox reactivity of surface species grafted on a single well-defined surface, at a concentration limit that is far below the monolayer coverage level and for a highly sensitive sample. A further improvement on the impurity level of the ReflEXAFS chamber is however required in order to be able to follow in situ the polymerization reaction. Our results demonstrate that the red-ox ability of the isolated surface Cr species is not enough to make a polymerization active species.

U2 - 10.1021/jp074066t

DO - 10.1021/jp074066t

M3 - Article

SN - 1932-7447

VL - 111

SP - 16437

EP - 16444

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 44

ER -

Reactivity of Cr species grafted on SiO2/Si(100) surface: a Reflection EXAFS study down to the sub-monolayer regime

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