Formulation of zeolite-mesoporous silica composite catalysts for light olefin production from catalytic cracking
作者机构：Univ Manchester Sch Engn Dept Chem Engn Manchester M13 9PL England Beijing Univ Technol Fac Environm & Life Beijing 100124 Peoples R China Diamond Light Source Harwell Sci & Innovat Campus Didcot OX11 0DE Oxon England Univ Manchester Harwell Diamond Light Source Harwell Sci & Innovat Campus Didcot OX11 0DE Oxon England Rutherford Appleton Lab UK Catalysis Hub Res Complex Harwell Didcot OX11 0FA Oxon England
出 版 物：《FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING》 (Front. Chem. Sci. Eng.)
年 卷 期：2024年第18卷第11期
页 面：133页
核心收录：
学科分类：0817[工学-化学工程与技术] 08[工学]
基 金：Ministry of High Education of Saudi Arabia China Scholarship Council UK Catalysis Hub
主 题：zeolites mesoporous silica composite catalysts catalytic cracking light olefins
摘 要：Framework materials such as zeolites and mesoporous silicas are commonly used for many applications, especially catalysis and separation. Here zeolite-mesoporous silica composite catalysts (employing zeolite Y, ZSM-5, KIT-6, SBA-15 and MCM-41 mesoporous silica) were prepared (with different weight percent of zeolite Y and ZSM-5) and assessed for catalytic cracking (using n-heptane, as the model compound at 550 degrees C) with the aim to improve the selectivity/yield of light olefins of ethylene and propylene from n-heptane. Physicochemical properties of the parent zeolites and the prepared composites were characterized comprehensively using several techniques including X-ray diffraction, nitrogen physisorption, scanning electron microscopy, fourier transform infrared spectroscopy, pulsed-field gradient nuclear magnetic resonance and thermogravimetric analysis. Catalytic cracking results showed that the ZY/ZSM-5/KIT-6 composite (20:20:60 wt %) achieved a high n-heptane conversion of 85% with approximately 6% selectivity to ethylene/propylene. In contrast, the ZY/ZSM-5/SBA-15 composite achieved a higher conversion of 95% and an ethylene/propylene ratio of 8%, indicating a more efficient process in terms of both conversion and selectivity. Magnetic resonance relaxation analysis of the ZY/ZSM-5/KIT-6 (20:20:60) catalyst confirmed a micro-mesoporous environment that influences n-heptane diffusion and mass transfer. As zeolite Y and ZSM-5 have micropores, n-heptane can move and undergo hydrogen transfer reactions, whereas KIT-6 has mesopores that facilitate n-heptane s accessibility to the active sites of zeolite Y and ZSM-5.
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