Dual-bed catalytic system comprising Al2O3 and Ba/Al2O3 with enhanced 1-octene productivity in 1-octanol dehydration for linear a-olefin production

To produce high-purity 1-octene, the dehydration of 1-octanol was performed over a dual-bed catalytic system comprising Al2O3 and Ba/Al2O3 catalysts. The influence of the catalyst weight on the activities of Al2O3 and Ba/Al2O3 single-bed systems was initially investigated at liquid hourly space velocities (LHSVs) of 7-168 h-1 at 400 degrees C. For the Al2O3 single-bed system, the 1-octene selectivity decreased with an increase in the catalyst weight. Although the 1-octene selectivity of Ba/Al2O3 increased owing to the anti-Saytzeff effect, its yield was limited due to a low 1-octanol conversion. The efficiency of the dual-bed catalytic system was subsequently investigated by varying the catalyst bed ratio (i.e., xAl-yBa). The 40Al-60Ba catalytic system afforded a higher conversion (95.3%) and productivity than the Ba/ Al2O3 single-bed system at an LHSV of 56 h-1. Moreover, the 10Al-90Ba catalytic system with a high Ba/Al2O3 catalyst ratio exhibited a high 1-octene productivity at LHSVs of 7-28 h-1, while also yielding a high-purity product. The single-bed system exhibited a lower selectivity toward 1-octene than the dual-bed system, and after 100 h, the 10Al-90Ba dual-bed system offered a stable catalytic performance regardless of the small reductions in the 1-octene selectivity and yield.(c) 2022 The Authors. Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engi-neering Chemistry. This is an open access article under the CC BY license (http://creativecommons.org/ licenses/by/4.0/).