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Selective Synthesis of Butene-1 Through Double-bond Migration of Butene-2 over η-Alumina Catalysts
전종기,Do Heui Kim,Young Kwon Park 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.9
Double bond migration of butene-2 to butene-1 over η-alumina was investigated. The effects of calcination temperature on catalytic properties were analyzed by applying BET surface area, XRD, NH3-TPD, and FT-IR of adsorbed pyridine techniques. The highest activity of the η-alumina catalyst calcined at 600 oC could be attributed not only to the highest amount of weak and medium strength acid sites, but also to the highest ratio of medium to weak strength Lewis acid sites.
Selective Positional Isomerization of 2-Butene over Alumina and La-promoted Alumina Catalysts
전종기,Kyungah Lee,Eui-Hwan Hwang,Young Soo Ko,박영권,Seong Jun Lee,Jae Ho Lee 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.7
Positional isomerization of 2-butene to 1-butene over alumina catalysts was investigated. The physical characteristics and acidity of activated alumina and η-alumina catalysts were analyzed by BET, XRD, ammonia-temperature programmed desorption, and infra-red spectroscopy of adsorbed pyridine. The effects of lanthanum addition on the acidity of catalysts and the isomerization were investigated. The yield of 1-butene over η-alumina catalyst was shown to be higher than that of activated alumina catalyst due to the larger BET surface area (287 m2/g) as well as the weak acidity of η-alumina. The catalytic activity does not correspond to the amount of Lewis acid sites, explaining the insignificant role of Lewis acid sites in the positional isomerization of 2-butene. It was proposed that the H site might be an active site for the positional isomerization of 2-butene to 1-butene.