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H-beta 제올라이트에서 폴리에틸렌 왁스의 액상 촉매분해반응
Liquid-phase Catalytic Cracking of Polyethylene Wax to Liquid over H-beta Zeolite
HWAHAK KONGHAK, June 1998, 36(3), 447-452(6), NONE
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Abstract
Si/Al 몰비가 13-120으로 다르고 인이나 세륨이 담지된 H-beta 제올라이트 촉매에서 폴리에틸렌(PE) 왁스의 액상 분해 반응을 조사하였다. 산점 수와 분포 위치에 따라 액체 생성물의 수율과 탄소수 분포 및 활성저하 정도가 달라졌다. 분해 활성은 높으나 활성저하가 상대적으로 느린 Si/Al 몰비가 28인 촉매에서 액체 생성물 수율이 가장 높았다. 반응온도가 높거나 촉매량이 많아지면 분해반응은 빨라졌으나, 액체 생성물의 탄소수 분포는 넓어졌다. 세륨 담지로 외표면 산점이 차폐된 촉매에서는 주로 세공내에서 분해반응이 진행되어 액체 생성물의 탄소수 분포가 좁아졌다.
Liquid-phase cracking of polyethylene(PE) wax was studied over H-beta zeolite catalysts with various Si/Al ratio(13-120) and impregnated with phosphorus or cerium. The yield and carbon number distribution of liquid products, and the deactivation rate over various catalysts were depended on the amount and the location site of acid sites. H-beta catalyst(Si/Al=28) showed the highest yield of liquid product due to its high cracking activity and the slow deactivation rate. The cracking rate increased with increasing the reaction temperature or the loading amount of catalyst, while liquid product showed wide distribution in carbon number. Ihe cracking proceeded mainly in the pore over cerium-modified catalyst which acid sites on the external surface were masked, resulted in the narrow distribution in carbon number of liquid product.
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