The mechanism of hydrogenolysis and isomerization of oxacycloalkanes on metals IX. structure sensitive hydrogenolysis and isomerization of methyloxirane over well-characterized Pt/SiO2 Catalysts

D. Ostgard, F. Notheisz, A. Zsigmond, G. V. Smith, M. Bartók

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6 Citations (Scopus)

Abstract

The hydrogenolysis of methyloxirane (propylene oxide) was investigated over five Pt/SiO2 catalysts with different degrees of dispersion (7-100%), at 393 K, with a pulse technique coupled with GC. The number of turnovers per surface atom per pulse (turnover yield) was found to depend on the degree of dispersion. The rate of the ring-opening reaction passed through a maximum at approximately 60% D, which corresponds to a maximum in edge sites on fcc octahedra, or to 2M sites. The regioselectivity of the ring opening did not depend upon the degree of dispersion, but the formation of the two main products (acetone and 2-propanol) displayed some structure sensitivity. The paper also deals with the interpretation of a recently observed example of structure sensitivity.

Original languageEnglish
Pages (from-to)519-523
Number of pages5
JournalJournal of Catalysis
Volume129
Issue number2
DOIs
Publication statusPublished - 1991

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hydrogenolysis
Hydrogenolysis
Isomerization
isomerization
Metals
catalysts
Catalysts
metals
Regioselectivity
propylene oxide
2-Propanol
sensitivity
rings
Propanol
Acetone
pulses
acetone
Propylene
Atoms
Oxides

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

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title = "The mechanism of hydrogenolysis and isomerization of oxacycloalkanes on metals IX. structure sensitive hydrogenolysis and isomerization of methyloxirane over well-characterized Pt/SiO2 Catalysts",
abstract = "The hydrogenolysis of methyloxirane (propylene oxide) was investigated over five Pt/SiO2 catalysts with different degrees of dispersion (7-100{\%}), at 393 K, with a pulse technique coupled with GC. The number of turnovers per surface atom per pulse (turnover yield) was found to depend on the degree of dispersion. The rate of the ring-opening reaction passed through a maximum at approximately 60{\%} D, which corresponds to a maximum in edge sites on fcc octahedra, or to 2M sites. The regioselectivity of the ring opening did not depend upon the degree of dispersion, but the formation of the two main products (acetone and 2-propanol) displayed some structure sensitivity. The paper also deals with the interpretation of a recently observed example of structure sensitivity.",
author = "D. Ostgard and F. Notheisz and A. Zsigmond and Smith, {G. V.} and M. Bart{\'o}k",
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T1 - The mechanism of hydrogenolysis and isomerization of oxacycloalkanes on metals IX. structure sensitive hydrogenolysis and isomerization of methyloxirane over well-characterized Pt/SiO2 Catalysts

AU - Ostgard, D.

AU - Notheisz, F.

AU - Zsigmond, A.

AU - Smith, G. V.

AU - Bartók, M.

PY - 1991

Y1 - 1991

N2 - The hydrogenolysis of methyloxirane (propylene oxide) was investigated over five Pt/SiO2 catalysts with different degrees of dispersion (7-100%), at 393 K, with a pulse technique coupled with GC. The number of turnovers per surface atom per pulse (turnover yield) was found to depend on the degree of dispersion. The rate of the ring-opening reaction passed through a maximum at approximately 60% D, which corresponds to a maximum in edge sites on fcc octahedra, or to 2M sites. The regioselectivity of the ring opening did not depend upon the degree of dispersion, but the formation of the two main products (acetone and 2-propanol) displayed some structure sensitivity. The paper also deals with the interpretation of a recently observed example of structure sensitivity.

AB - The hydrogenolysis of methyloxirane (propylene oxide) was investigated over five Pt/SiO2 catalysts with different degrees of dispersion (7-100%), at 393 K, with a pulse technique coupled with GC. The number of turnovers per surface atom per pulse (turnover yield) was found to depend on the degree of dispersion. The rate of the ring-opening reaction passed through a maximum at approximately 60% D, which corresponds to a maximum in edge sites on fcc octahedra, or to 2M sites. The regioselectivity of the ring opening did not depend upon the degree of dispersion, but the formation of the two main products (acetone and 2-propanol) displayed some structure sensitivity. The paper also deals with the interpretation of a recently observed example of structure sensitivity.

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