Effect of hydrogen on methane conversion to hydrocarbons in "one-step" reaction under non-oxidative conditions at low temperature over Pd-Co/SiO2 catalysts prepared by the sol/gel method

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Methane conversion to higher hydrocarbons in a "one-step" process under non-oxidative conditions at low temperature was here first introduced and investigated over Co-Pd/SiO2 catalysts at 250 °C as a function of hydrogen concentration in helium and of catalyst composition. A maximum in the production of C2+ hydrocarbons including aromatics (benzene and toluene) was observed at 1.3 vol% H2/He mixture in which one pulse of methane was introduced. Additional hydrogenation with the same H2/He mixture at 400 °C was efficient to remove the larger hydrocarbon fragments already existing on the surface. On pure Pd/SiO2 the one-step process is not so efficient as on cobalt-rich samples, but in the latter case the hydrocarbon removal is the most efficient during high-temperature hydrogenation. It was found that methane conversion in the one-step process is at least 2.5 times greater than that measured in the "two-step" process and, in some cases, 80% of the methane introduced is converted to larger hydrocarbons. The results are discussed in terms of the hydrogen coverage ensuring the optimum hydrogen content in the surface CHx species leading to chain growth. Co-Pd/SiO2 catalysts, preparation by sol/gel method, one-step methane conversion, hydrogen and composition effect.

Original languageEnglish
Pages (from-to)33-39
Number of pages7
JournalCatalysis Letters
Volume54
Issue number3-4
Publication statusPublished - 1998

Fingerprint

Methane
Hydrocarbons
Sol-gel process
Hydrogen
methane
hydrocarbons
gels
catalysts
Catalysts
hydrogen
Hydrogenation
hydrogenation
Temperature
Composition effects
Helium
Aromatic hydrocarbons
Toluene
Cobalt
Benzene
toluene

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

@article{23c3918520e8485c8a9cc02c722f9916,
title = "Effect of hydrogen on methane conversion to hydrocarbons in {"}one-step{"} reaction under non-oxidative conditions at low temperature over Pd-Co/SiO2 catalysts prepared by the sol/gel method",
abstract = "Methane conversion to higher hydrocarbons in a {"}one-step{"} process under non-oxidative conditions at low temperature was here first introduced and investigated over Co-Pd/SiO2 catalysts at 250 °C as a function of hydrogen concentration in helium and of catalyst composition. A maximum in the production of C2+ hydrocarbons including aromatics (benzene and toluene) was observed at 1.3 vol{\%} H2/He mixture in which one pulse of methane was introduced. Additional hydrogenation with the same H2/He mixture at 400 °C was efficient to remove the larger hydrocarbon fragments already existing on the surface. On pure Pd/SiO2 the one-step process is not so efficient as on cobalt-rich samples, but in the latter case the hydrocarbon removal is the most efficient during high-temperature hydrogenation. It was found that methane conversion in the one-step process is at least 2.5 times greater than that measured in the {"}two-step{"} process and, in some cases, 80{\%} of the methane introduced is converted to larger hydrocarbons. The results are discussed in terms of the hydrogen coverage ensuring the optimum hydrogen content in the surface CHx species leading to chain growth. Co-Pd/SiO2 catalysts, preparation by sol/gel method, one-step methane conversion, hydrogen and composition effect.",
author = "L. Guczi and L. Bork{\'o} and Z. Kopp{\'a}ny and F. Mizukami",
year = "1998",
language = "English",
volume = "54",
pages = "33--39",
journal = "Catalysis Letters",
issn = "1011-372X",
publisher = "Springer Netherlands",
number = "3-4",

}

TY - JOUR

T1 - Effect of hydrogen on methane conversion to hydrocarbons in "one-step" reaction under non-oxidative conditions at low temperature over Pd-Co/SiO2 catalysts prepared by the sol/gel method

AU - Guczi, L.

AU - Borkó, L.

AU - Koppány, Z.

AU - Mizukami, F.

PY - 1998

Y1 - 1998

N2 - Methane conversion to higher hydrocarbons in a "one-step" process under non-oxidative conditions at low temperature was here first introduced and investigated over Co-Pd/SiO2 catalysts at 250 °C as a function of hydrogen concentration in helium and of catalyst composition. A maximum in the production of C2+ hydrocarbons including aromatics (benzene and toluene) was observed at 1.3 vol% H2/He mixture in which one pulse of methane was introduced. Additional hydrogenation with the same H2/He mixture at 400 °C was efficient to remove the larger hydrocarbon fragments already existing on the surface. On pure Pd/SiO2 the one-step process is not so efficient as on cobalt-rich samples, but in the latter case the hydrocarbon removal is the most efficient during high-temperature hydrogenation. It was found that methane conversion in the one-step process is at least 2.5 times greater than that measured in the "two-step" process and, in some cases, 80% of the methane introduced is converted to larger hydrocarbons. The results are discussed in terms of the hydrogen coverage ensuring the optimum hydrogen content in the surface CHx species leading to chain growth. Co-Pd/SiO2 catalysts, preparation by sol/gel method, one-step methane conversion, hydrogen and composition effect.

AB - Methane conversion to higher hydrocarbons in a "one-step" process under non-oxidative conditions at low temperature was here first introduced and investigated over Co-Pd/SiO2 catalysts at 250 °C as a function of hydrogen concentration in helium and of catalyst composition. A maximum in the production of C2+ hydrocarbons including aromatics (benzene and toluene) was observed at 1.3 vol% H2/He mixture in which one pulse of methane was introduced. Additional hydrogenation with the same H2/He mixture at 400 °C was efficient to remove the larger hydrocarbon fragments already existing on the surface. On pure Pd/SiO2 the one-step process is not so efficient as on cobalt-rich samples, but in the latter case the hydrocarbon removal is the most efficient during high-temperature hydrogenation. It was found that methane conversion in the one-step process is at least 2.5 times greater than that measured in the "two-step" process and, in some cases, 80% of the methane introduced is converted to larger hydrocarbons. The results are discussed in terms of the hydrogen coverage ensuring the optimum hydrogen content in the surface CHx species leading to chain growth. Co-Pd/SiO2 catalysts, preparation by sol/gel method, one-step methane conversion, hydrogen and composition effect.

UR - http://www.scopus.com/inward/record.url?scp=0002943066&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0002943066&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0002943066

VL - 54

SP - 33

EP - 39

JO - Catalysis Letters

JF - Catalysis Letters

SN - 1011-372X

IS - 3-4

ER -