Alumina-supported chromium-based mixed-oxide catalysts in oxidative dehydrogenation of isobutane to isobutene

N. O. Elbashir, S. M. Al-Zahrani, A. E. Abasaeed, M. Abdulwahed

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The effect of various metal additives on the catalytic performance of a chromium-based alumina-supported catalyst in oxidative dehydrogenation of isobutane was investigated in the low reaction temperature range 200-350 °C and at atmospheric pressure. Various parameters such as Cr wt.% in Cr-M-O system, different iC4H10:O2 ratios at a total flow rate of 75 cm3/min, and contact time on the activity and selectivity of the catalysts were varied in this study. For the binary catalysts, the addition of Co and Ni enhanced the overall activity while W and Mo improved the catalyst selectivity to iC4H8. The presence of V and Li deteriorated significantly the catalyst activity and selectivity. Increasing the percent of Cr in Cr-M-O increased iC4H10 and O2 conversion at the expense of selectivity. Tertiary systems such as Cr-W-Co-O, Cr-W-Ni-O and Cr-Ni-Co-O gave a much better overall performance compared with Cr-O alone. In particular, Cr-W-Co-O improved the overall activity of Cr-O catalyst by 17% while its iC4H8 selectivity improved by 15%. The low temperature activity of these catalysts makes them important candidates for further investigations.

Original languageEnglish
Pages (from-to)817-823
Number of pages7
JournalChemical Engineering and Processing: Process Intensification
Volume42
Issue number10
DOIs
Publication statusPublished - Oct 2003
Externally publishedYes

Fingerprint

Butanes
Catalyst selectivity
Aluminum Oxide
Chromium
Dehydrogenation
Oxides
Alumina
Catalyst activity
Catalysts
Catalyst supports
Atmospheric pressure
Metals
Flow rate
Temperature
isobutylene

Keywords

  • Chromium-based catalysts
  • Isobutene
  • Multiphase reactors
  • Oxidative dehydrogenation
  • Packed bed
  • Reaction engineering
  • Selectivity

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Alumina-supported chromium-based mixed-oxide catalysts in oxidative dehydrogenation of isobutane to isobutene. / Elbashir, N. O.; Al-Zahrani, S. M.; Abasaeed, A. E.; Abdulwahed, M.

In: Chemical Engineering and Processing: Process Intensification, Vol. 42, No. 10, 10.2003, p. 817-823.

Research output: Contribution to journalArticle

Elbashir, N. O. ; Al-Zahrani, S. M. ; Abasaeed, A. E. ; Abdulwahed, M. / Alumina-supported chromium-based mixed-oxide catalysts in oxidative dehydrogenation of isobutane to isobutene. In: Chemical Engineering and Processing: Process Intensification. 2003 ; Vol. 42, No. 10. pp. 817-823.
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