1960
DOI: 10.1021/j100836a017
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Abstract: The kinetics of n-pentane isomerization over a Pt-A!203 catalyst were investigated at 372°. The reaction was carried out in a flow reactor in the presence of added hydrogen at pressures ranging from 7.7 to 27.7 atm. and hydrogen to n-pentane ratios ranging from 1.4 to 18. The rate of isomerization was found to correlate with the n-pentane to hydrogen mole ratio and to be independent of total reactor pressure at a fixed n-pentane to hydrogen ratio. These results can be explained in terms of the postulated mecha… Show more

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Cited by 75 publications
(24 citation statements)
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“…This fact in combination with low isomerization activity of platinum supported on much less acidic magnesium fluoride indicates that the reaction of n-pentane isomerization performed on Pd(Pt)/HS-AlF 3 catalysts occurs through the classical bifunctional mechanism, in which the alkane is dehydrogenated on a metal phase, and the alkene formed is protonated at Brønsted acid sites, yielding an alkylcarbenium ion. [26,27] It must be mentioned that the classic bifunctional metal-acid catalysts show hydrogen reaction orders between À1 and 0, hydrocarbon reaction orders close to 1, and apparent activation energy between 100 and 150 kJ mol À1 , [28][29][30][31][32][33][34][35][36] and similar kinetic parameters were also found in this study (Table 3).…”
Section: Discussionsupporting
confidence: 82%
“…This fact in combination with low isomerization activity of platinum supported on much less acidic magnesium fluoride indicates that the reaction of n-pentane isomerization performed on Pd(Pt)/HS-AlF 3 catalysts occurs through the classical bifunctional mechanism, in which the alkane is dehydrogenated on a metal phase, and the alkene formed is protonated at Brønsted acid sites, yielding an alkylcarbenium ion. [26,27] It must be mentioned that the classic bifunctional metal-acid catalysts show hydrogen reaction orders between À1 and 0, hydrocarbon reaction orders close to 1, and apparent activation energy between 100 and 150 kJ mol À1 , [28][29][30][31][32][33][34][35][36] and similar kinetic parameters were also found in this study (Table 3).…”
Section: Discussionsupporting
confidence: 82%
“…Investigating the skeletal isomerization of alkanes (Sinfelt et al, 1960;Ciapetta, 1961;Sterba and Haensel, 1976) and cycloalkanes (Sterba and Haensel, 1976), several research groups showed that, for bifunctional catalysts with more than 0.1 wt% of platinum, the isomerization of alkanes and cycloalkanes can no longer be increased by increasing the platinum content. For high platinum contents, the isomerization rate significantly increases with increasing halogen content, indicating that the reaction rate is limited by the acidity of the catalyst.…”
Section: Network Generationmentioning
confidence: 99%
“…Bifunctional isomerization of n-heptane involves catalysts containing a metallic function and an acidic one [18]. As the intermediate of the reaction is a carbocation, Bro¨nsted acid sites are required.…”
Section: Bet Surface Area Titration Of Metallic Sites and Lewis Andmentioning
confidence: 99%
“…Figure 5 shows the conversion of n-heptane versus contact time and the corresponding linear transforms for a first order reaction. This catalyst follows the Sinfelt model [18]. It involves three catalytic cycles which are not kinetically coupled.…”
Section: Isomerization Of N-heptanementioning
confidence: 99%