In situ UV-Vis diffuse reflectance spectroscopy - On line activity measurements of supported chromium oxide catalysts: Relating isobutane dehydrogenation activity with Cr-speciation via experimental design

Bert M. Weckhuysen; An A. Verberckmoes; Jan Debaere; Kristine Ooms; Ivan Langhans; Robert A. Schoonheydt

doi:10.1016/S1381-1169(99)00259-9

In situ UV-Vis diffuse reflectance spectroscopy - On line activity measurements of supported chromium oxide catalysts: Relating isobutane dehydrogenation activity with Cr-speciation via experimental design

Bert M. Weckhuysen^*, An A. Verberckmoes, Jan Debaere, Kristine Ooms, Ivan Langhans, Robert A. Schoonheydt

^*Corresponding author for this work

KU Leuven

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

Abstract

The dehydrogenation of isobutane over supported chromium oxide catalysts was studied by a combination of in situ UV-Vis diffuse reflectance spectroscopy and on line GC analysis. A well-defined set of experiments, based on an experimental design, was carded out to develop mathematical models, which quantitatively relate Cr-speciation and dehydrogenation activity with reaction temperature and time, support composition, gas composition and Cr loading. It will be shown that: (1) the dehydrogenation activity is proportional with the amount of in situ measured surface Cr²⁺/³⁺, and maximum for a 7.5 wt.% Cr/Al₂O₃ catalyst operating at 500°C in 2% isobutane in N₂; and (2) Cr³⁺-sites are more active in alkane dehydrogenation than Cr²⁺-sites. This paper is the first example of the use of experimental design for deriving structure-activity relationships in the field of heterogeneous catalysis. (C) 2000 Elsevier Science B.V.

Original language	English
Pages (from-to)	115-131
Number of pages	17
Journal	Journal of Molecular Catalysis A: Chemical
Volume	151
Issue number	1-2
DOIs	https://doi.org/10.1016/S1381-1169(99)00259-9
Publication status	Published - 15 Feb 2000
Externally published	Yes

Funding

B.M.W. is a postdoctoral fellow of the Fonds voor Wetenschappelijk Onderzoek-Vlaanderen (FWO). A.A.V. acknowledges a doctoral research grant of the Instituut voor Wetenschap en Technologie (IWT). This work was financially supported by the Geconcerteerde Onderzoeksactie (GOA) of the Flemish Government and by the FWO.

Keywords

Chemometrics
Diffuse reflectance spectroscopy
Experimental design
In situ spectroscopy
Supported chromium oxide catalysts

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Weckhuysen, B. M., Verberckmoes, A. A., Debaere, J., Ooms, K., Langhans, I., & Schoonheydt, R. A. (2000). In situ UV-Vis diffuse reflectance spectroscopy - On line activity measurements of supported chromium oxide catalysts: Relating isobutane dehydrogenation activity with Cr-speciation via experimental design. Journal of Molecular Catalysis A: Chemical, 151(1-2), 115-131. https://doi.org/10.1016/S1381-1169(99)00259-9

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title = "In situ UV-Vis diffuse reflectance spectroscopy - On line activity measurements of supported chromium oxide catalysts: Relating isobutane dehydrogenation activity with Cr-speciation via experimental design",

abstract = "The dehydrogenation of isobutane over supported chromium oxide catalysts was studied by a combination of in situ UV-Vis diffuse reflectance spectroscopy and on line GC analysis. A well-defined set of experiments, based on an experimental design, was carded out to develop mathematical models, which quantitatively relate Cr-speciation and dehydrogenation activity with reaction temperature and time, support composition, gas composition and Cr loading. It will be shown that: (1) the dehydrogenation activity is proportional with the amount of in situ measured surface Cr2+/3+, and maximum for a 7.5 wt.\% Cr/Al2O3 catalyst operating at 500°C in 2\% isobutane in N2; and (2) Cr3+-sites are more active in alkane dehydrogenation than Cr2+-sites. This paper is the first example of the use of experimental design for deriving structure-activity relationships in the field of heterogeneous catalysis. (C) 2000 Elsevier Science B.V.",

keywords = "Chemometrics, Diffuse reflectance spectroscopy, Experimental design, In situ spectroscopy, Supported chromium oxide catalysts",

author = "Weckhuysen, \{Bert M.\} and Verberckmoes, \{An A.\} and Jan Debaere and Kristine Ooms and Ivan Langhans and Schoonheydt, \{Robert A.\}",

year = "2000",

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doi = "10.1016/S1381-1169(99)00259-9",

language = "English",

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Weckhuysen, BM, Verberckmoes, AA, Debaere, J, Ooms, K, Langhans, I & Schoonheydt, RA 2000, 'In situ UV-Vis diffuse reflectance spectroscopy - On line activity measurements of supported chromium oxide catalysts: Relating isobutane dehydrogenation activity with Cr-speciation via experimental design', Journal of Molecular Catalysis A: Chemical, vol. 151, no. 1-2, pp. 115-131. https://doi.org/10.1016/S1381-1169(99)00259-9

In situ UV-Vis diffuse reflectance spectroscopy - On line activity measurements of supported chromium oxide catalysts: Relating isobutane dehydrogenation activity with Cr-speciation via experimental design. / Weckhuysen, Bert M.; Verberckmoes, An A.; Debaere, Jan et al.
In: Journal of Molecular Catalysis A: Chemical, Vol. 151, No. 1-2, 15.02.2000, p. 115-131.

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

TY - JOUR

T1 - In situ UV-Vis diffuse reflectance spectroscopy - On line activity measurements of supported chromium oxide catalysts

T2 - Relating isobutane dehydrogenation activity with Cr-speciation via experimental design

AU - Weckhuysen, Bert M.

AU - Verberckmoes, An A.

AU - Debaere, Jan

AU - Ooms, Kristine

AU - Langhans, Ivan

AU - Schoonheydt, Robert A.

PY - 2000/2/15

Y1 - 2000/2/15

N2 - The dehydrogenation of isobutane over supported chromium oxide catalysts was studied by a combination of in situ UV-Vis diffuse reflectance spectroscopy and on line GC analysis. A well-defined set of experiments, based on an experimental design, was carded out to develop mathematical models, which quantitatively relate Cr-speciation and dehydrogenation activity with reaction temperature and time, support composition, gas composition and Cr loading. It will be shown that: (1) the dehydrogenation activity is proportional with the amount of in situ measured surface Cr2+/3+, and maximum for a 7.5 wt.% Cr/Al2O3 catalyst operating at 500°C in 2% isobutane in N2; and (2) Cr3+-sites are more active in alkane dehydrogenation than Cr2+-sites. This paper is the first example of the use of experimental design for deriving structure-activity relationships in the field of heterogeneous catalysis. (C) 2000 Elsevier Science B.V.

AB - The dehydrogenation of isobutane over supported chromium oxide catalysts was studied by a combination of in situ UV-Vis diffuse reflectance spectroscopy and on line GC analysis. A well-defined set of experiments, based on an experimental design, was carded out to develop mathematical models, which quantitatively relate Cr-speciation and dehydrogenation activity with reaction temperature and time, support composition, gas composition and Cr loading. It will be shown that: (1) the dehydrogenation activity is proportional with the amount of in situ measured surface Cr2+/3+, and maximum for a 7.5 wt.% Cr/Al2O3 catalyst operating at 500°C in 2% isobutane in N2; and (2) Cr3+-sites are more active in alkane dehydrogenation than Cr2+-sites. This paper is the first example of the use of experimental design for deriving structure-activity relationships in the field of heterogeneous catalysis. (C) 2000 Elsevier Science B.V.

KW - Chemometrics

KW - Diffuse reflectance spectroscopy

KW - Experimental design

KW - In situ spectroscopy

KW - Supported chromium oxide catalysts

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Weckhuysen BM, Verberckmoes AA, Debaere J, Ooms K, Langhans I, Schoonheydt RA. In situ UV-Vis diffuse reflectance spectroscopy - On line activity measurements of supported chromium oxide catalysts: Relating isobutane dehydrogenation activity with Cr-speciation via experimental design. Journal of Molecular Catalysis A: Chemical. 2000 Feb 15;151(1-2):115-131. doi: 10.1016/S1381-1169(99)00259-9

In situ UV-Vis diffuse reflectance spectroscopy - On line activity measurements of supported chromium oxide catalysts: Relating isobutane dehydrogenation activity with Cr-speciation via experimental design

Abstract

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Keywords

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