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제올라이트 촉매상에서 메탄올 전환반응에 있어서의 코크형성

Coke Formation in the Conversion of Methanol over Zeolites Catalysts

HWAHAK KONGHAK, February 1983, 21(1), 1-6(6), NONE
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Abstract

Faujasite, mordenite 및 ZSM-5 제올라이트 촉매에서 메탄올 전환반응시 코크의 형성에 관하여 조사하였다. 코크의 형성은 제올라이트의 세공구조에 크게 의존하였다. Faujasite 촉매에서는 코크가 3차원 세공구조의 내부표면에 침적되어 유효 세공크기가 감소되며, 반응후기의 코크 형성은 확산에 제한을 받았다. Mordenite에서 표면적의 급격한 감소와 반응후기의 느린 코크형성은 코크게 의한 세공막힘에 기인된다고 보여졌다. ZSM-5 촉매에서 메탄올 전환반응에 있어서의 느린 코크형성은 높은 실리카 함량에 근거된 소수성으로, 물에 대한 구조적 안정성과 교차하는 세공관구조로 설명될 수 있었다.
Coke formation in the conversion of methanol over faujasite, mordenite, and ZSM-5 zeolite catalysts was studied. Coke formation was dependent on the pore structure of zeolites catalysts. For faujasite structures, coke was deposited at the internal surface of 3-dimensional pore, reducing the effective pore size reduction retarded the coke formation by diffusion limitation. The sharp decrease in the surface area and the slow rate of coke formation in mordenite were due to the blocking of pores by the coke deposited. The structural stability for water due to its hydrophobicity and intersecting channel pore structures seemed to be responsible for the slow rate of coke formation in the conversion of methanol to hydrocarbons over ZSM-5 zeolite.

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