Non-oxidative methane transformations into higher hydrocarbons over bimetallic Pt-Co catalysts supported on Al2O3 and NaY

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Abstract

The methane conversion under non-oxidative conditions over Al2O3 and NaY supported cobalt, platinum and Pt-Co bimetallic catalysts in a flow system has been investigated. The two-step process was applied in the temperature range between 523 and 673 K and 1 bar pressure and the one-step process was carried out under the conditions of 1073 K and 10 bar pressure. Addition of platinum to NaY and alumina supported cobalt samples results in the formation of metallic Co particles and Pt-Co bimetallic particles. On bimetallic catalysts in the two-step process, the amount of C2+ products formed were higher than that on monometallic samples. The synergism shown by the bimetallic system can be explained by: (i) enhanced reducibility of cobalt, and (ii) the co-operation of two types of active components (Co facilitates the chain-growth of partially dehydrogenated species produced on Pt in Pt-Co bimetallic particles). The use of higher pressures and high temperature makes it possible to run the process to form primarily ethane (and ethylene) which is predicted from thermodynamic calculations. For NaY as support, significantly enhanced activity and C2+ selectivity are obtained compared with Al2O3 as support, which can be attributed to the structural differences of metal particles (location, dispersion and reducibility).

Original languageEnglish
Pages (from-to)35-43
Number of pages9
JournalTopics in Catalysis
Volume39
Issue number1-2
DOIs
Publication statusPublished - Nov 2006

Fingerprint

Methane
Hydrocarbons
Cobalt
Catalyst supports
cobalt
methane
hydrocarbons
Platinum
catalysts
platinum
Catalysts
Ethane
Aluminum Oxide
metal particles
ethane
Ethylene
ethylene
Alumina
aluminum oxides
selectivity

Keywords

  • Catalysts
  • Conversion
  • Methane
  • Nanoparticles
  • Non-oxidative
  • Pt-Co/AlO
  • Pt-Co/NaY
  • Synergy

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

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abstract = "The methane conversion under non-oxidative conditions over Al2O3 and NaY supported cobalt, platinum and Pt-Co bimetallic catalysts in a flow system has been investigated. The two-step process was applied in the temperature range between 523 and 673 K and 1 bar pressure and the one-step process was carried out under the conditions of 1073 K and 10 bar pressure. Addition of platinum to NaY and alumina supported cobalt samples results in the formation of metallic Co particles and Pt-Co bimetallic particles. On bimetallic catalysts in the two-step process, the amount of C2+ products formed were higher than that on monometallic samples. The synergism shown by the bimetallic system can be explained by: (i) enhanced reducibility of cobalt, and (ii) the co-operation of two types of active components (Co facilitates the chain-growth of partially dehydrogenated species produced on Pt in Pt-Co bimetallic particles). The use of higher pressures and high temperature makes it possible to run the process to form primarily ethane (and ethylene) which is predicted from thermodynamic calculations. For NaY as support, significantly enhanced activity and C2+ selectivity are obtained compared with Al2O3 as support, which can be attributed to the structural differences of metal particles (location, dispersion and reducibility).",
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N2 - The methane conversion under non-oxidative conditions over Al2O3 and NaY supported cobalt, platinum and Pt-Co bimetallic catalysts in a flow system has been investigated. The two-step process was applied in the temperature range between 523 and 673 K and 1 bar pressure and the one-step process was carried out under the conditions of 1073 K and 10 bar pressure. Addition of platinum to NaY and alumina supported cobalt samples results in the formation of metallic Co particles and Pt-Co bimetallic particles. On bimetallic catalysts in the two-step process, the amount of C2+ products formed were higher than that on monometallic samples. The synergism shown by the bimetallic system can be explained by: (i) enhanced reducibility of cobalt, and (ii) the co-operation of two types of active components (Co facilitates the chain-growth of partially dehydrogenated species produced on Pt in Pt-Co bimetallic particles). The use of higher pressures and high temperature makes it possible to run the process to form primarily ethane (and ethylene) which is predicted from thermodynamic calculations. For NaY as support, significantly enhanced activity and C2+ selectivity are obtained compared with Al2O3 as support, which can be attributed to the structural differences of metal particles (location, dispersion and reducibility).

AB - The methane conversion under non-oxidative conditions over Al2O3 and NaY supported cobalt, platinum and Pt-Co bimetallic catalysts in a flow system has been investigated. The two-step process was applied in the temperature range between 523 and 673 K and 1 bar pressure and the one-step process was carried out under the conditions of 1073 K and 10 bar pressure. Addition of platinum to NaY and alumina supported cobalt samples results in the formation of metallic Co particles and Pt-Co bimetallic particles. On bimetallic catalysts in the two-step process, the amount of C2+ products formed were higher than that on monometallic samples. The synergism shown by the bimetallic system can be explained by: (i) enhanced reducibility of cobalt, and (ii) the co-operation of two types of active components (Co facilitates the chain-growth of partially dehydrogenated species produced on Pt in Pt-Co bimetallic particles). The use of higher pressures and high temperature makes it possible to run the process to form primarily ethane (and ethylene) which is predicted from thermodynamic calculations. For NaY as support, significantly enhanced activity and C2+ selectivity are obtained compared with Al2O3 as support, which can be attributed to the structural differences of metal particles (location, dispersion and reducibility).

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