Hydrogen pressure dependence in the ring-opening reactions of propylcyclobutane over Pd/SiO2 catalyst

Béla Török, I. Pálinkó, M. Bartók

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Temperature dependence and the effects of hydrogen pressure on the rate and regioselectivity were studied in the ring opening of propylcyclobutane over a low-dispersion Pd/SiO2 catalyst. At a certain composition (1.33 kPa of propylcyclobutane and 20 kPa of H2) the reaction rate versus temperature curve was found to pass through a maximum. At each temperature the ring opened selectively (or exclusively at 423 K) in the sterically more hindered direction over the clean surface as well as over the steady-state catalyst, yielding n-heptane as the major product. The hydrogen pressure versus turnover frequency curves were of saturation type for both products over the initial surface at 523 K. Over the steady-state surface, however, the reaction mechanism changed: ring-opening rate versus hydrogen pressure curve passed through a maximum for n-heptane, while it remained of saturation type for 3-methylhexane. For rationalizing the high regioselectivity toward n-heptane formation, the anchoring effect of the propyl side-chain was suggested.

Original languageEnglish
Pages (from-to)421-429
Number of pages9
JournalCatalysis Letters
Volume31
Issue number4
DOIs
Publication statusPublished - Dec 1995

Fingerprint

Heptane
heptanes
pressure dependence
Hydrogen
Regioselectivity
catalysts
Catalysts
rings
curves
hydrogen
saturation
Surface states
products
Temperature
Reaction rates
reaction kinetics
temperature dependence
temperature
Chemical analysis
n-heptane

Keywords

  • anchoring effect
  • hydrogen pressure dependence
  • hydrogenative ring opening
  • Pd/SiO
  • propylcyclobutane

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

Hydrogen pressure dependence in the ring-opening reactions of propylcyclobutane over Pd/SiO2 catalyst. / Török, Béla; Pálinkó, I.; Bartók, M.

In: Catalysis Letters, Vol. 31, No. 4, 12.1995, p. 421-429.

Research output: Contribution to journalArticle

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AB - Temperature dependence and the effects of hydrogen pressure on the rate and regioselectivity were studied in the ring opening of propylcyclobutane over a low-dispersion Pd/SiO2 catalyst. At a certain composition (1.33 kPa of propylcyclobutane and 20 kPa of H2) the reaction rate versus temperature curve was found to pass through a maximum. At each temperature the ring opened selectively (or exclusively at 423 K) in the sterically more hindered direction over the clean surface as well as over the steady-state catalyst, yielding n-heptane as the major product. The hydrogen pressure versus turnover frequency curves were of saturation type for both products over the initial surface at 523 K. Over the steady-state surface, however, the reaction mechanism changed: ring-opening rate versus hydrogen pressure curve passed through a maximum for n-heptane, while it remained of saturation type for 3-methylhexane. For rationalizing the high regioselectivity toward n-heptane formation, the anchoring effect of the propyl side-chain was suggested.

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