On the mechanism of n-butane disproportionation over platinum supported on tungstated zirconia: Isotopic labeling studies

Gustavo Larsen; Lucía M. Petkovic

doi:10.1016/S1381-1169(96)00270-1

On the mechanism of n-butane disproportionation over platinum supported on tungstated zirconia: Isotopic labeling studies

Gustavo Larsen, Lucía M. Petkovic

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

17 Scopus citations

Abstract

The reactions of n-butane over platinum supported on tungstated zirconia in the presence of hydrogen were studied using isotopically labeled n-butanes and deuterium. All reaction pathways experience isotopic effects when the hydrogen flow is replaced by an equal flow of deuterium. The non-rate limiting formation of a bimolecular intermediate appears to account for the disproportionation products. Mass spectrometric analysis of the product stream also reveals that the intramolecular 1-2 shift of the labeled primary carbon atoms is easily detected under primary-product-only reaction regimes.

Original language	English (US)
Pages (from-to)	517-522
Number of pages	6
Journal	Journal of Molecular Catalysis A: Chemical
Volume	113
Issue number	3
DOIs	https://doi.org/10.1016/S1381-1169(96)00270-1
State	Published - Dec 10 1996

Keywords

Disproportionation mechanism
Isotopic effect
Tungstated zirconia
n-Butane labeling

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology
Physical and Theoretical Chemistry

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10.1016/S1381-1169(96)00270-1

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title = "On the mechanism of n-butane disproportionation over platinum supported on tungstated zirconia: Isotopic labeling studies",

abstract = "The reactions of n-butane over platinum supported on tungstated zirconia in the presence of hydrogen were studied using isotopically labeled n-butanes and deuterium. All reaction pathways experience isotopic effects when the hydrogen flow is replaced by an equal flow of deuterium. The non-rate limiting formation of a bimolecular intermediate appears to account for the disproportionation products. Mass spectrometric analysis of the product stream also reveals that the intramolecular 1-2 shift of the labeled primary carbon atoms is easily detected under primary-product-only reaction regimes.",

keywords = "Disproportionation mechanism, Isotopic effect, Tungstated zirconia, n-Butane labeling",

author = "Gustavo Larsen and Petkovic, {Luc{\'i}a M.}",

note = "Funding Information: This research was supported in part by the NSF (grant KTS-9406718) and by the American Chemical Society (Petroleum Research Fund, grant #31067-AC5). Support from the Research Council and the Layman Fund of the University of Nebraska is also acknowledged. One of us (LMP) thanks the University of San Juan (Argentina) for financial support. We also gratefully acknowledge the valuable comments made by the referees, which helped us improve the quality of our manuscript.",

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doi = "10.1016/S1381-1169(96)00270-1",

language = "English (US)",

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pages = "517--522",

journal = "Journal of Molecular Catalysis A: Chemical",

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TY - JOUR

T1 - On the mechanism of n-butane disproportionation over platinum supported on tungstated zirconia

T2 - Isotopic labeling studies

AU - Larsen, Gustavo

AU - Petkovic, Lucía M.

N1 - Funding Information: This research was supported in part by the NSF (grant KTS-9406718) and by the American Chemical Society (Petroleum Research Fund, grant #31067-AC5). Support from the Research Council and the Layman Fund of the University of Nebraska is also acknowledged. One of us (LMP) thanks the University of San Juan (Argentina) for financial support. We also gratefully acknowledge the valuable comments made by the referees, which helped us improve the quality of our manuscript.

PY - 1996/12/10

Y1 - 1996/12/10

N2 - The reactions of n-butane over platinum supported on tungstated zirconia in the presence of hydrogen were studied using isotopically labeled n-butanes and deuterium. All reaction pathways experience isotopic effects when the hydrogen flow is replaced by an equal flow of deuterium. The non-rate limiting formation of a bimolecular intermediate appears to account for the disproportionation products. Mass spectrometric analysis of the product stream also reveals that the intramolecular 1-2 shift of the labeled primary carbon atoms is easily detected under primary-product-only reaction regimes.

AB - The reactions of n-butane over platinum supported on tungstated zirconia in the presence of hydrogen were studied using isotopically labeled n-butanes and deuterium. All reaction pathways experience isotopic effects when the hydrogen flow is replaced by an equal flow of deuterium. The non-rate limiting formation of a bimolecular intermediate appears to account for the disproportionation products. Mass spectrometric analysis of the product stream also reveals that the intramolecular 1-2 shift of the labeled primary carbon atoms is easily detected under primary-product-only reaction regimes.

KW - Disproportionation mechanism

KW - Isotopic effect

KW - Tungstated zirconia

KW - n-Butane labeling

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U2 - 10.1016/S1381-1169(96)00270-1

DO - 10.1016/S1381-1169(96)00270-1

M3 - Article

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VL - 113

SP - 517

EP - 522

JO - Journal of Molecular Catalysis A: Chemical

JF - Journal of Molecular Catalysis A: Chemical

SN - 1381-1169

IS - 3

ER -

On the mechanism of n-butane disproportionation over platinum supported on tungstated zirconia: Isotopic labeling studies

Abstract

Keywords

ASJC Scopus subject areas

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