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알칼리금속 이온교환 제올라이트 X의 산 및 염기특성에 미치는 붕소 첨가효과

Effect of Boron-Incorporation on the Acid-Base Property of Alkalimetal Exchanged Zeolite X

문세기 김형진 서교택

Moon SK Kim HJ Seo KT

HWAHAK KONGHAK, August 1989, 27(4), 422-429(8), NONE

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Abstract

적외선 분광기와 열탈착법을 이용하여 붕소가 첨가된 알칼리 양이온교환 제올라이트 X의 산 및 염기특성을 조사하였다. 첨가된 붕소는 촉매의 산성도를 급격히 감소시켰으며, 톨루엔의 측쇄알킬화반응 중에 수반되는 촉매의 산도변화를 어느 정도 억제한 역할을 하였다. 그러나, 염기도에는 거의 영향을 미치지 못하였다. 결론적으로, 첨가된 붕소의 역할은 톨루엔의 측쇄인 메틸기의 활성화를 조장하여 톨루엔의 측정할킬화반응을 선택적으로 일으키는 것으로 유추된다.

Infrared spectroscopy and temperature-programmed desorption have been used to investigate the acid-base properties of alkali cation exchanged X zeolites incorporated with boron. Boron led to decrease the acidity of fresh catalyst rapidly and to lower the acidity-decay during the reaction, side-chain alkylation of toluene with methanol. But boron can not affect the basicity, significantly. In conclusion, it seems reasonable that the role of boron is to help the activation of methyl group of toluene, which accelerates the side-chain alkylation of toluene selectively.

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