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Gallozeolite 촉매에 의한 저급탄화수소의 방향족화합물로의 전환반응

Catalytic Conversions of Lower Hydrocarbons to Aromatic Compounds over Gallozeolites

김재승 서곤 김진환 박남국

Kim JS Seo G Kim JH Park NC

HWAHAK KONGHAK, June 1989, 27(3), 260-267(8), NONE

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Abstract

실리카라이트의 실리콘 대신 갈륨이 치환된 갈로제올라이트 촉매상에서 프로필렌, 프로판 및 n-펜탄의 방향족화합물로의 전환반응을 연구하였다. 암모니아와 프로필렌의 TPD 및 반응물질의 유효확산계수와 관련하여 갈로제올라이트의 반응별 촉매특성를 조사하였다. 방향족화합물의 선택도는 HZSM-5에 비하여 갈륨이 치환된 촉매에서 더 컸으며 갈륨의 치환효과는 프로판>n-펜탄> 프로필렌의 순으로 나타났다. 갈로제올라이트에서는 반응물인 저급탄화수소의 유효확산계수와 올레핀의 흡착세기가 크기 때문에 방향족화합물의 선택도가 커진 것으로 고찰되었다.

Catalytic conversions of propylene, propane and n-pentane to aromatic hydrocarbons over gallium-substituted silicalites were studied. Temperature-programmed desorptions(TPD)with ammonia and propylene and intracrystalline effective diffusivity measurements of reactants were carried out to investigate the catalytic properties of gallozeolites for each reaction. The selectivity for aromatic compounds was higher over the gallium-substituted catalysts than over HZSM-5 and the effect of gallium on the selectivity for aromatic compounds was found to be in the order of propane>n-pentane>propylene. It was explained that the higher selectivity for aromatic compounds over gallozeolites might be attributed to great adsorption strengths of olefins and high effective diffusivities of lower hydro-carbons.

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