Citation: Rui FENG, Jia-Ming SHEN, Bao LIU, Tian-Bo LI, Xiao-Yan HU, Xin-Long YAN, Zhong-Dong ZHANG. 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. doi: 10.11862/CJIC.2023.183 shu

Synthesis of ZSM-5 zeolites with low silica-to-alumina ratio and its performance in the cracking of n-heptane

1.
School of Chemical Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
2.
Petrochina Petrochemical Research Institute, CNPC, Beijing 102206, China

Corresponding author: Rui FENG, fengrui@cumt.edu.cn Zhong-Dong ZHANG, zhangzhongdong@petrochina.com.cn
Received Date: 28 June 2023
Revised Date: 27 September 2023

Figures(13)

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.
- ZSM-5 zeolite,
- hydrothermal synthesis,
- low silica-to-alumina ratio,
- catalytic cracking,
- light olefin
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