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변형된 ZSM-5촉매상에서 n-헥산의 방향족화 반응에 관한 연구 I. HZSM-5촉매의 Si/Al 비의 영향
Aromatization of n-Hexane over Modified ZSM-5 Catalysts-1. Effect of the Si/Al Ratio of HZSM-5 Catalyst
HWAHAK KONGHAK, April 1994, 32(2), 248-255(8), NONE
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Abstract
형상 선택성이 우수한 ZSM-5 촉매를 Si/Al비를 달리하여 제조한 다음 n-헥산의 방향족화 반응에 적용하였다. HZSM-5 촉매상에서 n-헥산은 일단 C1-C5 범위의 탄화수소로 크레킹된 후 이 중에서 프로필렌과 C4 탄화수소가 2차적으로 반응을 일으켜 방향족 화합물을 생성시키는 것으로 관찰되었다. 방향족 화합물은 Si/Al 비가 100이하인 HZSM-5 촉매상에서만 생성되었으며 반응온도가 상승할수록 방향족 화합물의 선택도가 높았는데 BTX 중에서 톨루엔이 가장 많이 생성되었다. 크래킹 반응에 의한 저급 탄화수소의 생성과정과 방향족화 과정을 Si/Al 비 및 반응온도와 연관지어 n-헥산의 반응경로를 유추하였으며 이를 바탕으로 HZSM-5 촉매상에서 방향족화 반응에 유리한 조건을 규명하였다.
ZSM-5 catalyst was synthesized with various Si/Al ratios and applied for the aromatization of n-hexane. Over HZSM-5 catalyst, n-hexane was first cracked to yield C1-C5 hydrocarbons, of which propylene and C4 were converted to aromatics via secondary reactions. Aromatics were observed over HZSM-5 catalysts of Si/Al ratios below 100 and the selectivity to aromatics increased with the temperature. Among aromatics, toluene was the major product. The reaction pathways were deduced by analyzing each reaction step of cracking and aromatization in connection with the Si/Al ratio and the reaction temperature. Based on these results, favorable conditions for the aromatization of n-hexane over HZSM-5 catalyst were investigated.
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