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HY-제올라이트 및 백금담지 HY-제올라이트 촉매에 의한 자일렌의 기상 이성질화반응

Gas-phase Isomerization of Xylene over HY-Zeolite and Pt-Loaded HY-Zeolite

HWAHAK KONGHAK, October 1987, 25(5), 497-503(7), NONE
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Abstract

HY-제올라이트 및 HY-제올라이트에 백금을 담지시킨 촉매(Pt/HY)에 의한 자일렌의 기상 이성질화반응에 있어서의 반응 메카니즘을 연구하였다. 또한 이러한 촉매들에 의한 에틸벤젠을 포함한 혼합자일렌의 이성질화반응에 대한 연구도 수행하였다. HY-제올라이트에 의한 자일렌의 이성질화반응은 분자간 알킬기 전환(intermolecular transalkylation) 메카니즘과 분자내 1, 2-메틸기 이동(intramolecular 1,2-methyl shift) 메카니즘에 의해 진행되며, 이러한 각각의 메카니즘의 전체반응에 대한 기여도는 반응조건에 의존함을 알았다. Pt/HY촉매에 의한 자일렌의 이성질화반응은 수소첨가된 (hydrogenated) 중간생성물을 거쳐 진행되며, 비교적 안정한 carbocation을 거쳐 반응이 진행되려는 경향이 있음을 알았다. 그리고 혼합자일렌이 HY-제올라이트에 의해 이성질화되는 과정에 있어서는 에틸벤젠이 자일렌보다 알킬기 전환의 정도가 큼을 알 수 있었다.
The mechanism of xylene isomerization over HY-zeolite and Pt-loaded HY-zeolite (Pt/HY) was studied. And the isomerization of mixed xylene containing ethylbenzene over the above catalysts was also investigated. As the results of experiments, vapor-phase isomerization of xylene over HY-zeolite proceeded via intermolecular transalkylation mechanism and intramolecular 1,2-methyl shift mechanism simultaneously, and the contribution of each mechanism to the overall reaction depended on reaction condition. Over Pt/HY, the isomerization of xylene occurred through hydrogenated intermediates and had tendency to proceed via the route involving more stable carbocation preferentially. In the isomerization of mixed xylene over HY-zeolite, the extent of transalkylation of ethylbenzene was higher than that of xylene.

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