Formulation of zeolite-mesoporous silica composite catalysts for light olefin production from catalytic cracking
Hassan Alhassawi1(), Edidiong Asuquo1, Shima Zainal1, Yuxin Zhang1, Abdullah Alhelali1, Zhipeng Qie1,2, Christopher M. A. Parlett1,3,4,5, Carmine D’Agostino1, Xiaolei Fan1, Arthur A. Garforth1()
1. Department of Chemical Engineering, School of Engineering, The University of Manchester, Manchester M13 9PL, UK 2. Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China 3. Diamond Light Source Harwell Science and Innovation Campus, Oxfordshire OX11 0DE, UK 4. University of Manchester at Harwell, Diamond Light Source Harwell Science and Innovation Campus, Oxfordshire OX11 0DE, UK 5. UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Oxfordshire OX11 0FA, UK
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 °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.
Corresponding Author(s):
Hassan Alhassawi,Arthur A. Garforth
引用本文:
. [J]. Frontiers of Chemical Science and Engineering, 2024, 18(11): 133.
Hassan Alhassawi, Edidiong Asuquo, Shima Zainal, Yuxin Zhang, Abdullah Alhelali, Zhipeng Qie, Christopher M. A. Parlett, Carmine D’Agostino, Xiaolei Fan, Arthur A. Garforth. Formulation of zeolite-mesoporous silica composite catalysts for light olefin production from catalytic cracking. Front. Chem. Sci. Eng., 2024, 18(11): 133.
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