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염기성 제올라이트상에서 톨루엔의 메탄올에 의한 측쇄 알킬화반응
Side-Chain Alkylation of Toluene with Methanol over Basic Zeolites
HWAHAK KONGHAK, June 1994, 32(3), 456-462(7), NONE
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Abstract
톨루엔의 메탄올에 의한 알킬화반응을 대기압, 420℃, 2-6의 톨루엔/메탄올 몰비로 흐름반응기에서 수행하였다. 촉매들은 사용의 X형 제올라이트를 알칼리 양이온교환 또는 NaN3의 함침법으로 만들었다. 자일렌 수율은 NaX>Na-cluster X>KX 순서로 감소하였으며, 스티렌과 에틸벤젠의 수율은 역순으로 나타났다. 이러한 결과들은 고리 알킬화반응과 측쇄 알릴화반응이 각각 촉매의 산성도와 염기도에 의존함을 시사한다. DSC로 산성도와 염기도의 분포를 아울러 조사하였고, 촉매들의 성능과 결부시켰다. 반응과정에서 촉매표면의 산.염기 성질이 중요한 역할을 한다고 판단된다.
Catalytic alkylation of toluene with methanol was studied at atmospheric pressure, 420℃, and toluene/methanol feed molar ratios of 2-6 in a fixed bed reactor. Catalysts were prepared from the commercial X-type zeolite by ion exchange with alkali cations and/or impergnation of NaN3. The yield of xylenes decreased in the catalyst sequence NaX>Na-cluster X>KX; the reverse tendency was found for the yield of styrene and ethylbenzene. These results suggest that benzene ring alkylation and side-chain alkylation depend on the catalyst acidity and basicity, respectively. The distributions of the acidity and basicity were also investigated by differential scanning calorimetry(DSC) and correlated with the performance of the catalysts. It was thought that a surface acid property as well as a surface base property played an important role in the course of the reaction.
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Park SH, Kim MH, Kim HJ, Moon SK, HWAHAK KONGHAK, 31(4), 369 (1993)
