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톨루엔의 알킬화반응에서의 Y-제올라이트 촉매의 활성에 관한 연구
A Study on the Activities of Y-Zeolite Catalysts in Alkylation of Toluene
HWAHAK KONGHAK, October 1986, 24(5), 415-422(8), NONE
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Abstract
에탄올에 의한 톨루엔의 알킬화반응으로 자일렌을 생성하는 과정에서 Y-제올라이트 촉매의 활성변화에 관한 연구를 하였다. 실험은 고정상 촉매를 사용하여 연속적으로 수행하였으며, 반응물은 마이크로펌프를 이용하여 주입하였다. 생성된 전체 자일렌의 양은 반응시간이 지남에 따라 감소하였으나 p-자일렌의 선택성은 증가하였다. 활성저하속도를 줄이기 위하여 사용촉매를 수증기 및 강산으로 처리하였다. 수증기 및 강산처리한 촉매의 활성은 처리를 하지 않은 촉매에 비해서 증가하였으며, 활성저하속도도 줄어들었다. 자일렌 이성질체의 구성분포는 사용촉매의 Brönsted산의 농도에 의존하였으며, 특히 강산으로 Y-제올라이트 촉매를 처리하였을 때, m-자일렌의 생성량이 증가하였다.
The activities of Y-zeolite catalysts were studied in alkylation of toluene with methanol to produce xylene isomers. The experiments were carried out continuously over fixed bed catalysts and reactants wee fed by a micropump. The amount of total xylene decreased with time-on-stream, while the selectivity of p-xylene increased. In order to reduce the deactivation rate, catalysts were treated with water vapor or strong acids. It has been found that the modified catalysts by treatment show higher activities and lower deactivation rate than the corresponding untreated caltalysts. It has also been shown that the distribution of xylene isomers is dependent on the concentration of Brönsted acid of the catalysts employed. Moreover, the formation of m-xylene increased when the catalysts were treated with strong acids.