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상압에서 합성된 ZSM-5의 물리 화학적 특성 및 프로펜의 전환반응

Physico-Chemical Characteristics of the ZSM-5 Crystallized at Atmospheric Pressure and Conversion of Propene on the ZSM-5

박진우 함현식 김조웅 하재목 정택서 박현영

Park JW Hahm HS Kim JW Ha JM Jeong TS Park HY

HWAHAK KONGHAK, June 1998, 36(3), 369-374(6), NONE

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Abstract

상압하에서 60시간 동안 합성시킨 ZSM-5(Si/Al₂≃70)의 결정은 구조적으로 안정하였으며 결정전체의 Si/Al의 몰비가 표면의 Si/Al의 몰비보다 1.24배 정도 작아 표면보다는 결정내부에서 알루미늄의 농도가 높은 것을 알 수 있었다. 또한 비표면적은 상업적으로 이용되는 ZSM-5(Si/Al₂≃80)보다 50m²/g이 더 큰 것으로 나타났다. DTA분석 결과 1,100℃에서 구조의 파괴가 일어나 열적 안정성이 우수한 것으로 나타났다. 400, 450 및 500℃와 GHSV=1,300h^-1의 조건에서 각각 프로펜의 전환반응을 시킨 결과 방향족 화합물의 선택도는 온도의 영향을 크게 받지 않는 것으로 나타났으나, 방향족 생성물의 분포는 많은 차이를 보여 주었다. 500℃에서 20.5시간 동안 촉매의 활성을 살펴 본 결과 프로펜의 전환율은 1.5%정도 줄어들었으나 방향족 화합물의 선택도는 42wt%로 유지되었다.

The ZSM-5(Si/Al₂≃70) crystallized at atmospheric pressure for 60h was stable in structure. Concentration of aluminium at the inner of crystalline was higher than that at the surface. Compared with commercial ZSM-5(Si/Al₂≃80, PQ), the surface area of ZSM-5 synthesized in this study was larger by 50m²/g. Based on the result of DTA, thermal stability of this ZSM-5 was so excellent that it was not destructed up to 1,100℃. Conversion of propane into aromatics was performed at 400, 450, and 500℃ with GHSV=1,300h^-1. As the result, selectivity of total aromatics was changed slightly at these temperatures, but distributions of produced aromatics were very different. Activity of this ZSM-5 was studied at 500℃ for 20.5h. The result showed that the selectivity of aromatics was maintained about 42wt% consistently but the conversion of propene was decreased by about 1.5%.

Keywords

ZSM-5 Propane Atmospheric Pressure Aromatics ²⁷Al-MAS NMR

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