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

Authors
Kim, Young-eunIm, Hyo BeenJung, Un HoPark, Ji ChanYoun, Min HyeJeong, Heon-DoLee, Dong-WookRhim, Geun BaeChun, Dong HyunLee, Ki BongKoo, Kee Young
Issue Date
15-11월-2019
Publisher
ELSEVIER SCI LTD
Keywords
Linear alpha-olefin; Alcohol dehydration; 1-octene; 1-octanol; Al2O3 catalyst
Citation
FUEL, v.256
Indexed
SCIE
SCOPUS
Journal Title
FUEL
Volume
256
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/61581
DOI
10.1016/j.fuel.2019.115957
ISSN
0016-2361
Abstract
The linear alpha-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 degrees C) were evaluated at 300-400 degrees C with a liquid hourly space velocity (LHSV) of 7-56 h(-1). XRD, BET, Al-27-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 degrees C, the surface area of Al2O3 catalysts reduced due to gamma-Al2O3 to theta-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 acing as LAS on the catalyst surface increased with increasing calcination temperature, but decreased above 750 degrees C calcination temperature due to the diminishing surface area. The Al2O3 catalyst calcined at 500 degrees 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).
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