Mechanisms of n-butane isomerization over superacidic sulfated metal oxides

Tien Syn Yang, Tsong Huei Chang, Chiu-Hsun Lin, Chuin Tih Yeh

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Superacidic sulfated metal oxides were prepared by impregnating different metal oxides (or hydroxides) with sulfuric acids. The superacidic strength of prepared samples were compared by temperature-programmed desorption of ammonia (NH3-TPD) and showed a trend of HS/ZrO2 > HS/MgAl2O4 > HS/Al2O3 > HS/Fe2O3. Catalytic properties of these superacidic samples towards isomerization of n-butane to isobutane were subsequently pursued. Both the activity and the isobutane selectivity increased with the superacidic strength of catalysts. Observed variation in the selectivity was interpreted with a difference in the reaction mechanism: A high selectivity was obtained from strong superacid sites that catalyze the isomerization through a revised monomolecular mechanism; while a low selectivity became dominated on weak superacid sites that favored a bimolecular mechanism. The relative importance of these two mechanisms was kinetically controlled by formation of different butyl carbenium ions (primary or secondary) while the n-butane reactant adsorbed on superacidic sites. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)397-402
Number of pages6
JournalJournal of Molecular Catalysis A: Chemical
Volume159
Issue number2
DOIs
Publication statusPublished - 2000 Oct 2

Fingerprint

Butanes
Hydroxides
Catalyst selectivity
Butane
Temperature programmed desorption
butanes
Isomerization
isomerization
hydroxides
Sulfuric Acids
selectivity
Metals
Sulfuric acid
Ammonia
metals
Ions
impregnating
Catalysts
sulfuric acid
ammonia

All Science Journal Classification (ASJC) codes

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

Cite this

Yang, Tien Syn ; Chang, Tsong Huei ; Lin, Chiu-Hsun ; Yeh, Chuin Tih. / Mechanisms of n-butane isomerization over superacidic sulfated metal oxides. In: Journal of Molecular Catalysis A: Chemical. 2000 ; Vol. 159, No. 2. pp. 397-402.
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Mechanisms of n-butane isomerization over superacidic sulfated metal oxides. / Yang, Tien Syn; Chang, Tsong Huei; Lin, Chiu-Hsun; Yeh, Chuin Tih.

In: Journal of Molecular Catalysis A: Chemical, Vol. 159, No. 2, 02.10.2000, p. 397-402.

Research output: Contribution to journalArticle

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