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| Synthesis of ZSM-5 zeolites with low silica-to-alumina ratio and its performance in the cracking of n-heptane |
| Author Name | Affiliation | E-mail | | FENG Rui | School of Chemical Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China | fengrui@cumt.edu.cn | | SHEN Jia-Ming | School of Chemical Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China | | | LIU Bao | School of Chemical Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China | | | LI Tian-Bo | School of Chemical Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China | | | HU Xiao-Yan | School of Chemical Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China | | | YAN Xin-Long | School of Chemical Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China | | | ZHANG Zhong-Dong | Petrochina Petrochemical Research Institute, CNPC, Beijing 102206, China | zhangzhongdong@petrochina.com.cn |
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| Abstract: ZSM-5 zeolites with low silica-to-alumina ratios were hydrothermally synthesized by adding NH4+ cation and using ammonia as mineralizer. The effects of Si source, Al source, mineralizer, and cation on the physiochemical properties of the prepared ZSM-5 zeolites were investigated. The crystallinity, crystal size, and silica-to-alumina ratio of zeolites were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), solid state nuclear magnetic resonance (MAS-NMR), etc. The effect of silica-to-alumina ratio on the catalytic cracking of n-heptane was also studied. The results demonstrate that the lower the silica-to-alumina ratio feeding, the harder it is for Al atoms to insert into zeolite framework. Hydrogen-form ZSM-5 zeolites with low framework silica-to-alumina ratios could be synthesized with ammonia as mineralizer and tetraethyl orthosilicate as Si source. The addition of NH4+ cation enhanced the insertion of Al atom and the framework silica-to-alumina ratio of ZSM-5 further decreased to 24.2. The results of n-heptane cracking showed that the conversion of n-heptane was improved with decreasing the framework silica-to-alumina ratio of ZSM-5 zeolites, however, the selectivity of light olefins was decreased. |
| Keywords: ZSM-5 zeolite hydrothermal synthesis low silica-to-alumina ratio catalytic cracking light olefin |
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| FENG Rui,SHEN Jia-Ming,LIU Bao,LI Tian-Bo,HU Xiao-Yan,YAN Xin-Long,ZHANG Zhong-Dong.Synthesis of ZSM-5 zeolites with low silica-to-alumina ratio and its performance in the cracking of n-heptane[J].Chinese Journal of Inorganic Chemistry,2023,39(11):2042-2054. |
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