화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.13, No.7, 1062-1066, December, 2007
Selective Positional Isomerization of 2-Butene over Alumina and La-promoted Alumina Catalysts
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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.
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