Transformation of carbon compounds on graphimet catalysts. Part V. The effect of pretreatment on the structure and activity of Pt-graphimet catalyst

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Abstract

The effect of medium-temperature reduction (MTR, 573 K) on the structure and catalytic activity of Pt-graphimet was studied by transmission electron microscopy, small angle X-ray scattering, O2H2 titration and sorption microcalorimetry. The test reaction was the hydrogenation of cyclohexene. MTR resulted in the migration of interlayer platinum atoms to the catalyst surface, leading to metal aggregation and the formation of additional inserted active sites responsible for increased O2 and H2 adsorption. The decrease in catalytic activity observed upon MTR is attributed to the encapsulation of small surface particles inside the graphite 'host'.

Original languageEnglish
Pages (from-to)115-121
Number of pages7
JournalJournal of Molecular Catalysis A: Chemical
Volume99
Issue number2
Publication statusPublished - Jun 20 1995

Fingerprint

carbon compounds
pretreatment
catalytic activity
Catalyst activity
Carbon
catalysts
Catalysts
Graphite
Platinum
X ray scattering
Titration
Encapsulation
titration
sorption
Hydrogenation
hydrogenation
Sorption
interlayers
platinum
Agglomeration

Keywords

  • Calorimetry
  • Cyclohexene
  • Hydrogenation
  • Medium temperature pretreatment
  • OH titration
  • Pt-graphimet
  • Small angle X-ray scattering
  • Sorption microcalorimetry
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Process Chemistry and Technology
  • Catalysis

Cite this

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title = "Transformation of carbon compounds on graphimet catalysts. Part V. The effect of pretreatment on the structure and activity of Pt-graphimet catalyst",
abstract = "The effect of medium-temperature reduction (MTR, 573 K) on the structure and catalytic activity of Pt-graphimet was studied by transmission electron microscopy, small angle X-ray scattering, O2H2 titration and sorption microcalorimetry. The test reaction was the hydrogenation of cyclohexene. MTR resulted in the migration of interlayer platinum atoms to the catalyst surface, leading to metal aggregation and the formation of additional inserted active sites responsible for increased O2 and H2 adsorption. The decrease in catalytic activity observed upon MTR is attributed to the encapsulation of small surface particles inside the graphite 'host'.",
keywords = "Calorimetry, Cyclohexene, Hydrogenation, Medium temperature pretreatment, OH titration, Pt-graphimet, Small angle X-ray scattering, Sorption microcalorimetry, Transmission electron microscopy",
author = "A. Mastalir and F. Notheisz and M. Bart{\'o}k and Z. Kir{\'a}ly and I. D{\'e}k{\'a}ny",
year = "1995",
month = "6",
day = "20",
language = "English",
volume = "99",
pages = "115--121",
journal = "Journal of Molecular Catalysis A: Chemical",
issn = "1381-1169",
publisher = "Elsevier",
number = "2",

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T1 - Transformation of carbon compounds on graphimet catalysts. Part V. The effect of pretreatment on the structure and activity of Pt-graphimet catalyst

AU - Mastalir, A.

AU - Notheisz, F.

AU - Bartók, M.

AU - Király, Z.

AU - Dékány, I.

PY - 1995/6/20

Y1 - 1995/6/20

N2 - The effect of medium-temperature reduction (MTR, 573 K) on the structure and catalytic activity of Pt-graphimet was studied by transmission electron microscopy, small angle X-ray scattering, O2H2 titration and sorption microcalorimetry. The test reaction was the hydrogenation of cyclohexene. MTR resulted in the migration of interlayer platinum atoms to the catalyst surface, leading to metal aggregation and the formation of additional inserted active sites responsible for increased O2 and H2 adsorption. The decrease in catalytic activity observed upon MTR is attributed to the encapsulation of small surface particles inside the graphite 'host'.

AB - The effect of medium-temperature reduction (MTR, 573 K) on the structure and catalytic activity of Pt-graphimet was studied by transmission electron microscopy, small angle X-ray scattering, O2H2 titration and sorption microcalorimetry. The test reaction was the hydrogenation of cyclohexene. MTR resulted in the migration of interlayer platinum atoms to the catalyst surface, leading to metal aggregation and the formation of additional inserted active sites responsible for increased O2 and H2 adsorption. The decrease in catalytic activity observed upon MTR is attributed to the encapsulation of small surface particles inside the graphite 'host'.

KW - Calorimetry

KW - Cyclohexene

KW - Hydrogenation

KW - Medium temperature pretreatment

KW - OH titration

KW - Pt-graphimet

KW - Small angle X-ray scattering

KW - Sorption microcalorimetry

KW - Transmission electron microscopy

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M3 - Article

AN - SCOPUS:0000388704

VL - 99

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EP - 121

JO - Journal of Molecular Catalysis A: Chemical

JF - Journal of Molecular Catalysis A: Chemical

SN - 1381-1169

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ER -