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공업화학 , 촉매 / 반응공학 : 티타늄 함유 ZSM-5 촉매의 에탄올에 의한 톨루엔 알킬화 반응 특성
반한승(Han Seung Ban),장수현(Soo Hyun Chang),안화승(Wha Seung Ahn) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.2
Performances of Ti-ZSM-5 catalysts for toluene alkylation using ethanol were evaluated and compared with those of H-ZSM-5 or Mg-modified ZSM-5. Investigation on the influences of reaction parameters on the alkylation reaction was also conducted. The highest ethyltoluene and p-ethyltoluene, among the isomers, selectivities were obtained ca 350℃, and higher toluene/ethanol molar ratio and shorter contact time were necessary in order to suppress the side reactions. Ti-ZSM-5(1% Ti) prepared using Ludox silica showed enhanced para-selectivity compared to pure ZSM-5 and more resistant toward deactivation caused by carbonaceous deposit. According to the NH_3-TPD analysis, acid strength and amounts of acid sites of ZSM-5 were significantly reduced by the incorporation of titanium into the zeolite framework, which were responsible for the improved p-ethyltoluene yield.