Effect of Ba impregnation on Al2O3 catalyst for 1-octene production by 1-octanol dehydration
| Autor: | Un-Ho Jung, Kee Young Koo, Dahye Song, Geun Bae Rhim, Young Eun Kim, Hyo Been Im, Ji Chan Park, Heon Do Jeong, Dong-Wook Lee, Dong Hyun Chun, Min Hye Youn, Ki Bong Lee |
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| Rok vydání: | 2020 |
| Předmět: |
Olefin fiber
020209 energy General Chemical Engineering Organic Chemistry Energy Engineering and Power Technology Ether 02 engineering and technology medicine.disease Catalysis chemistry.chemical_compound Fuel Technology 020401 chemical engineering chemistry 0202 electrical engineering electronic engineering information engineering medicine Dehydration Lewis acids and bases 0204 chemical engineering Selectivity Nuclear chemistry 1-Octene Space velocity |
| Zdroj: | Fuel. 281:118791 |
| ISSN: | 0016-2361 |
| DOI: | 10.1016/j.fuel.2020.118791 |
| Popis: | This study investigated the effect of impregnating Ba into an Al2O3 catalyst on the acid-base property and catalytic activity in the dehydration of 1-octanol to produce 1-octene. The Ba/Al2O3 catalysts were prepared by the incipient wetness method with different Ba contents of 0.0–3.0 wt%, and characterized by ICP-MS, BET-BJH, XRD, pyridine-FTIR, and CO2-TPD. The catalytic activity in 1-octanol dehydration was evaluated at 300, 350, and 400 °C with liquid hourly space velocity (LHSV) of 7–56 h−1. As the amount of Ba increased, the density of the basic site on Ba/Al2O3 increased, and the strength distribution of the Lewis acid site (LAS) was changed. Under the reaction condition of 400 °C and LHSV = 7 h−1, Ba/Al2O3 showed higher 1-octene selectivity and 1-octene purity compared with the pure Al2O3 even though the 1-octanol conversion was similar. This is because the added Ba eliminated the strong LAS, which, in turn, inhibited the side-reaction originating from the re-adsorption of 1-octene. When LHSV > 21 h−1, Ba/Al2O3 catalysts showed decreased 1-octanol conversion but maintained high 1-octene selectivity and 1-octene purity. As the Ba content reached 2.0 wt%, 1-octene selectivity was decreased as the formation of dioctyl ether became more active than olefin production. Therefore, 1.5 wt% Ba/Al2O3 is the optimal catalyst for producing 1-octene from 1-octanol in terms of 1-octanol conversion, 1-octene selectivity, and 1-octene yield. |
| Databáze: | OpenAIRE |
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