Production of linear Α-olefin 1-octene via dehydration of 1-octanol over Al2O3 catalyst

Young eun Kim, Hyo Been Im, Un Ho Jung, Ji Chan Park, Min Hye Youn, Heon Do Jeong, Dong Wook Lee, Geun Bae Rhim, Dong Hyun Chun, Ki Bong Lee, Kee Young Koo

Research output: Contribution to journalArticle

Abstract

The linear α-olefin 1-octene was produced via the dehydration of 1-octanol over Al2O3 catalysts. The effect of calcination temperature on the characteristics of an Al2O3 catalyst and its activity in the dehydration of 1-octanol to 1-octene was investigated. Al2O3 catalysts calcined at various temperatures (250, 500, 750, 1000 °C) were evaluated at 300–400 °C with a liquid hourly space velocity (LHSV) of 7–56 h−1. XRD, BET, 27Al-NMR, Py-FTIR, and NH3-TPD analyses indicated that the calcination temperature affected the crystal phase, surface area, occupancy of the coordinated Al3+ ion, and acidic properties of Al2O3 catalysts. Upon calcination at temperatures >750 °C, the surface area of Al2O3 catalysts reduced due to γ-Al2O3 to θ-Al2O3 phase transition. The changes in the crystal phase decreased the surface area, which correlated to the acidity of the Al2O3 catalyst. The distribution of unsaturated Al3+ ions acting as LAS on the catalyst surface increased with increasing calcination temperature, but decreased above 750 °C calcination temperature due to the diminishing surface area. The Al2O3 catalyst calcined at 500 °C showed the highest 1-octanol conversion in the dehydration of 1-octanol. High 1-octene selectivity was maintained while the isomer ratio decreased at a high LHSV of 56 h−1.

Original languageEnglish
Article number115957
JournalFuel
Volume256
DOIs
Publication statusPublished - 2019 Nov 15

Keywords

  • 1-octanol
  • 1-octene
  • AlO catalyst
  • Alcohol dehydration
  • Linear α-olefin

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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    Kim, Y. E., Im, H. B., Jung, U. H., Park, J. C., Youn, M. H., Jeong, H. D., Lee, D. W., Rhim, G. B., Chun, D. H., Lee, K. B., & Koo, K. Y. (2019). Production of linear Α-olefin 1-octene via dehydration of 1-octanol over Al2O3 catalyst. Fuel, 256, [115957]. https://doi.org/10.1016/j.fuel.2019.115957