Determination of active centres in Re2O7-Al2O3 metathesis catalysts by titration method

Che Seman Mahmood, Mohd. Ambar Yarmo, Sharifah Bee Derouane Abd Hamid

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A chemisorption technique has been developed for the quantitative determination of active centres in Re2O7-Al2O3 metathesis catalysts. Butene-2 and ethylene were used as chemical probes to generate metal-carbene species on the active centres of the catalyst and eventually propylene as product. Catalysts with metal loading from 2% to 8% Re were shown to contain active centres in an amount equivalent to 0.6-2.2% Re/g catalyst. Catalysts prepared in hydrochloric acid medium contain about 5% more active centres than those prepared in aqueous medium, as measured by metathesis of propylene. It was also demonstrated that the surface area of the support could further influence the activity of the catalysts. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)11-16
Number of pages6
JournalJournal of Molecular Catalysis A: Chemical
Volume161
Issue number1-2
DOIs
Publication statusPublished - 6 Nov 2000

Fingerprint

metathesis
Titration
titration
catalysts
Catalysts
propylene
Propylene
Metals
Hydrochloric Acid
hydrochloric acid
carbenes
butenes
Hydrochloric acid
Chemisorption
Butenes
Catalyst supports
metals
chemisorption
Catalyst activity
Ethylene

Keywords

  • Active centres
  • Chemical probe
  • Metathesis
  • Rhenium oxide on alumina

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Determination of active centres in Re2O7-Al2O3 metathesis catalysts by titration method. / Mahmood, Che Seman; Yarmo, Mohd. Ambar; Hamid, Sharifah Bee Derouane Abd.

In: Journal of Molecular Catalysis A: Chemical, Vol. 161, No. 1-2, 06.11.2000, p. 11-16.

Research output: Contribution to journalArticle

Mahmood, Che Seman ; Yarmo, Mohd. Ambar ; Hamid, Sharifah Bee Derouane Abd. / Determination of active centres in Re2O7-Al2O3 metathesis catalysts by titration method. In: Journal of Molecular Catalysis A: Chemical. 2000 ; Vol. 161, No. 1-2. pp. 11-16.
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