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HWAHAK KONGHAK,
Vol.36, No.4, 571-575, 1998
Vol.36, No.4, 571-575, 1998
알칼리 담지 실리카-알루미나 촉매에서 1-부텐 골격이성화반응
Skeletal Isomerization of 1-Butene over Alkali-Modified Silica-Alumina Catalysts
알칼리를 담지시킨 실리카-알루미나 촉매에서 알칼리 담지로 인한 1-부텐 골격이성화반응의 전화율 및 선택도 변화를 조사하였다. 알칼리 담지로 실리카-알루미나의 표면적과 산점이 줄어들었다. 알칼리 담지량이 많아질수록 1-부텐 전화율은 낮아졌으나, 이소부텐 선택도는 높아졌다. 알칼리 담지로 인한 골격이성화반응의 전화율 감소, 선택도 향상, 활성저하 억제 등은 산점 농도의 감소와 연관지어 고찰하였으며, 알칼리 담지로 인한 이소부텐 선택도 향상은 산점이 줄어 이분자 반응경로를 거치는 중합-크래킹 반응이 억제되는데 따른 결과로 설명되었다.
Variations of conversion and selectivity in the skeletal isomerization of 1-butane with the loading of alkali on silica-alumina catalysts were investigated. Surface area and the number of acid site of silica-alumina decreased with the alkali modification. The conversion of 1-butene decreased but the selectivity to iso-butene increased when the loading level of alkali increased. The decrease in the conversion, the increase in the selectivity to iso-butene and the depressed deactivation of alkali-modified catalyst were related to the acid site concentration. The improvement of the selectivity to iso-butene with alkali loading was due to the decrease in the acid site concentration, resulting in suppression of multi-molecular oligomerization followed by cracking.
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