Kinetics of hydroisomerization of C5-C7 alkanes and their mixtures over platinum containing mordenite

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

The hydroisomerization of n-pentane (n-C5), n-hexane (n-C6), n-heptane (n-C7), cyclohexane (c-C6) and their binary mixtures, n-C5/n-C6, n-C6/n-C7, n-C6/c-C6, was investigated over platinum loaded hydrogen mordenite catalyst at 180-220°C, 5-40 bar total pressure and hydrogen to hydrocarbon molar ratios 1-20. The apparent activation energies of isomerization are 147, 123, 118 and 114 kJ/mol in case of n-C5, n-C6, n-C7 and c-C6, respectively. The reaction orders in alkane up to 4bar are 0.33, 0.39, 0.15 and 0.18, as well as the reaction orders in hydrogen up to 36bar are -0.81, -0.65, -1.08 and -0.57 for n-C5, n-C6, n-C7 and c-C6, respectively. Rate equations were derived and parameters involved determined for the isomerization of pure paraffins. Kinetic results of n-C5, n-C6 and c-C6 in lower pressure range (palkane, pH2 ≤ 4bar) suggest that the isomerization reaction on acid sites is rate-determining step. But in the case of n-C7 or at higher pressures of n-C6 and c-C6 (pH2 ≥ 20bar, palkane > 5 bar approximately), the zeolite micropore is getting filled with reactants resulting in diffusional inhibition. Experimental data for binary mixtures showed that the reaction rate of both components decreased on mixing. The component having higher boiling point exerts higher inhibiting effect on the hydroisomerization of more volatile alkane than inversely. Kinetic equations for binary mixtures were also proposed.

Original languageEnglish
Pages (from-to)93-102
Number of pages10
JournalApplied Catalysis A: General
Volume229
Issue number1-2
DOIs
Publication statusPublished - Apr 10 2002

Fingerprint

Alkanes
Isomerization
Binary mixtures
Platinum
Paraffins
Hydrogen
Kinetics
Zeolites
Boiling point
Heptane
Cyclohexane
Hydrocarbons
Hexane
Paraffin
Reaction rates
Activation energy
Catalysts
Acids
mordenite

Keywords

  • C-C alkanes
  • Hydrocarbon mixtures
  • Hydroisomerization
  • Kinetics
  • Platinum hydrogen-mordenite

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Kinetics of hydroisomerization of C5-C7 alkanes and their mixtures over platinum containing mordenite. / Holló, A.; Hancsók, J.; Kalló, D.

In: Applied Catalysis A: General, Vol. 229, No. 1-2, 10.04.2002, p. 93-102.

Research output: Contribution to journalArticle

@article{dd3a32e9347c490b98d4f73797a77532,
title = "Kinetics of hydroisomerization of C5-C7 alkanes and their mixtures over platinum containing mordenite",
abstract = "The hydroisomerization of n-pentane (n-C5), n-hexane (n-C6), n-heptane (n-C7), cyclohexane (c-C6) and their binary mixtures, n-C5/n-C6, n-C6/n-C7, n-C6/c-C6, was investigated over platinum loaded hydrogen mordenite catalyst at 180-220°C, 5-40 bar total pressure and hydrogen to hydrocarbon molar ratios 1-20. The apparent activation energies of isomerization are 147, 123, 118 and 114 kJ/mol in case of n-C5, n-C6, n-C7 and c-C6, respectively. The reaction orders in alkane up to 4bar are 0.33, 0.39, 0.15 and 0.18, as well as the reaction orders in hydrogen up to 36bar are -0.81, -0.65, -1.08 and -0.57 for n-C5, n-C6, n-C7 and c-C6, respectively. Rate equations were derived and parameters involved determined for the isomerization of pure paraffins. Kinetic results of n-C5, n-C6 and c-C6 in lower pressure range (palkane, pH2 ≤ 4bar) suggest that the isomerization reaction on acid sites is rate-determining step. But in the case of n-C7 or at higher pressures of n-C6 and c-C6 (pH2 ≥ 20bar, palkane > 5 bar approximately), the zeolite micropore is getting filled with reactants resulting in diffusional inhibition. Experimental data for binary mixtures showed that the reaction rate of both components decreased on mixing. The component having higher boiling point exerts higher inhibiting effect on the hydroisomerization of more volatile alkane than inversely. Kinetic equations for binary mixtures were also proposed.",
keywords = "C-C alkanes, Hydrocarbon mixtures, Hydroisomerization, Kinetics, Platinum hydrogen-mordenite",
author = "A. Holl{\'o} and J. Hancs{\'o}k and D. Kall{\'o}",
year = "2002",
month = "4",
day = "10",
doi = "10.1016/S0926-860X(02)00018-2",
language = "English",
volume = "229",
pages = "93--102",
journal = "Applied Catalysis A: General",
issn = "0926-860X",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - Kinetics of hydroisomerization of C5-C7 alkanes and their mixtures over platinum containing mordenite

AU - Holló, A.

AU - Hancsók, J.

AU - Kalló, D.

PY - 2002/4/10

Y1 - 2002/4/10

N2 - The hydroisomerization of n-pentane (n-C5), n-hexane (n-C6), n-heptane (n-C7), cyclohexane (c-C6) and their binary mixtures, n-C5/n-C6, n-C6/n-C7, n-C6/c-C6, was investigated over platinum loaded hydrogen mordenite catalyst at 180-220°C, 5-40 bar total pressure and hydrogen to hydrocarbon molar ratios 1-20. The apparent activation energies of isomerization are 147, 123, 118 and 114 kJ/mol in case of n-C5, n-C6, n-C7 and c-C6, respectively. The reaction orders in alkane up to 4bar are 0.33, 0.39, 0.15 and 0.18, as well as the reaction orders in hydrogen up to 36bar are -0.81, -0.65, -1.08 and -0.57 for n-C5, n-C6, n-C7 and c-C6, respectively. Rate equations were derived and parameters involved determined for the isomerization of pure paraffins. Kinetic results of n-C5, n-C6 and c-C6 in lower pressure range (palkane, pH2 ≤ 4bar) suggest that the isomerization reaction on acid sites is rate-determining step. But in the case of n-C7 or at higher pressures of n-C6 and c-C6 (pH2 ≥ 20bar, palkane > 5 bar approximately), the zeolite micropore is getting filled with reactants resulting in diffusional inhibition. Experimental data for binary mixtures showed that the reaction rate of both components decreased on mixing. The component having higher boiling point exerts higher inhibiting effect on the hydroisomerization of more volatile alkane than inversely. Kinetic equations for binary mixtures were also proposed.

AB - The hydroisomerization of n-pentane (n-C5), n-hexane (n-C6), n-heptane (n-C7), cyclohexane (c-C6) and their binary mixtures, n-C5/n-C6, n-C6/n-C7, n-C6/c-C6, was investigated over platinum loaded hydrogen mordenite catalyst at 180-220°C, 5-40 bar total pressure and hydrogen to hydrocarbon molar ratios 1-20. The apparent activation energies of isomerization are 147, 123, 118 and 114 kJ/mol in case of n-C5, n-C6, n-C7 and c-C6, respectively. The reaction orders in alkane up to 4bar are 0.33, 0.39, 0.15 and 0.18, as well as the reaction orders in hydrogen up to 36bar are -0.81, -0.65, -1.08 and -0.57 for n-C5, n-C6, n-C7 and c-C6, respectively. Rate equations were derived and parameters involved determined for the isomerization of pure paraffins. Kinetic results of n-C5, n-C6 and c-C6 in lower pressure range (palkane, pH2 ≤ 4bar) suggest that the isomerization reaction on acid sites is rate-determining step. But in the case of n-C7 or at higher pressures of n-C6 and c-C6 (pH2 ≥ 20bar, palkane > 5 bar approximately), the zeolite micropore is getting filled with reactants resulting in diffusional inhibition. Experimental data for binary mixtures showed that the reaction rate of both components decreased on mixing. The component having higher boiling point exerts higher inhibiting effect on the hydroisomerization of more volatile alkane than inversely. Kinetic equations for binary mixtures were also proposed.

KW - C-C alkanes

KW - Hydrocarbon mixtures

KW - Hydroisomerization

KW - Kinetics

KW - Platinum hydrogen-mordenite

UR - http://www.scopus.com/inward/record.url?scp=0037051541&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037051541&partnerID=8YFLogxK

U2 - 10.1016/S0926-860X(02)00018-2

DO - 10.1016/S0926-860X(02)00018-2

M3 - Article

AN - SCOPUS:0037051541

VL - 229

SP - 93

EP - 102

JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

SN - 0926-860X

IS - 1-2

ER -