Oxidative dehydrogenation of isobutane on chromium oxide-based catalyst

B. Y. Jibril, N. O. Elbashir, S. M. Al-Zahrani, A. E. Abasaeed

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Isobutane oxidative dehydrogenation offers a prospect of cheaper and environment friendly route to isobutene. The reaction has been studied at 250 °C, 1 atm and feed flow rate of 75 cm3/min over supported chromium oxide-based catalysts. Effects of various supports (Al 2O3, MgO, TiO2 and SiO2), catalyst precursors (K2Cr2O7, CaCr2O 7·H2O, CrO3, CrK(SO4) 2·12H2O and Cr(NO3)3· 9H2O) and binary mixed metal oxide catalysts of the form Cr-M-oxide/γ-Al2O3 (where M is V, Ni, Co, Mo, W, Ho, La, Li or Bi) were investigated. The supported catalysts are ranked (based on isobutene yields at 250 °C) as; Cr-Mg-O (3.4%) = Cr-Si-O (3.4%) < Cr-Ti-O (4.5%) < Cr-Al-O (6.0%). The performances of the catalysts showed strong dependence on the precursor used. The 10 wt.% Cr-Al-O prepared using K 2Cr2O7 and CrK(SO4) 2·2H2O exhibited the lowest isobutene yields of 0.14 and 0.3%, respectively. Partial substitution of chromium ions with nickel or tungsten exhibited minor increase in selectivity to isobutene of about 6% at comparable isobutane conversions. Substitution with other metals show similar or inferior performance compared with the base catalyst. Thus, showing that chromium oxide-based catalysts are active for the reaction and their performance could be improved by appropriate choice of active component precursor, support and additives.

Original languageEnglish
Pages (from-to)835-840
Number of pages6
JournalChemical Engineering and Processing: Process Intensification
Volume44
Issue number8
DOIs
Publication statusPublished - Aug 2005
Externally publishedYes

Fingerprint

Butanes
Dehydrogenation
Chromium
Catalysts
Oxides
Catalyst supports
Substitution reactions
Metals
Potassium Dichromate
Tungsten
Nickel
chromium oxide
Flow rate
Ions
isobutylene

Keywords

  • Bimetallic catalyst
  • Chromium oxide catalyst
  • Isobutane
  • Isobutene
  • Oxidative dehydrogenation of isobutane

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Oxidative dehydrogenation of isobutane on chromium oxide-based catalyst. / Jibril, B. Y.; Elbashir, N. O.; Al-Zahrani, S. M.; Abasaeed, A. E.

In: Chemical Engineering and Processing: Process Intensification, Vol. 44, No. 8, 08.2005, p. 835-840.

Research output: Contribution to journalArticle

Jibril, B. Y. ; Elbashir, N. O. ; Al-Zahrani, S. M. ; Abasaeed, A. E. / Oxidative dehydrogenation of isobutane on chromium oxide-based catalyst. In: Chemical Engineering and Processing: Process Intensification. 2005 ; Vol. 44, No. 8. pp. 835-840.
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