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Study on synthesis of hierarchical flower⁃like ZSM-5 zeolite and its catalytic performance for n-octane cracking
Received date: 2024-01-24
Online published: 2024-09-26
The research and development of high activity catalysts has been a hot topic in the field of catalytic cracking of naphtha to produce light olefins.In this paper，the flower⁃like ZSM-5 zeolite was synthesized by using the Gemini quaternary ammonium surfactant［C18H37-N+（CH3）2-C6H12-N+（CH3）2-C6H13］Br2 as structure⁃directing agent.The effects of crystallization temperature，n（Si）/n（Al），n（H2O）/n（SiO2） and n（Na2O）/n（SiO2） on the physicochemical properties of the ZSM-5 zeolite were investigated by XRD，SEM，N2 adsorption⁃desorption and NH3-TPD characterization techniques，and the catalytic cracking performance of n-octane on ZSM-5 zeolite was investigated.The research results showed that formation of flower ZSM-5 zeolite was optimized preparation conditions is the raw material molar composition of n（Na2O）∶n（Al2O3）∶n（SiO2）∶n（C18-6-6Br2）∶n（H2O）=5∶1∶100∶10∶4 000，crystallization time of 72 h，the crystallization temperature of 175 ℃.With the increase of n（Si）/n（Al），the flower⁃like ZSM-5 particles tended to agglomerate more.When the feeding n（Na2O）/n（SiO2） was higher than 0.05，other heterophase appeared in the zeolite samples.With the increase of n（H2O）/n（SiO2），the layer morphology of ZSM-5 zeolite gradually became less obvious.In the catalytic cracking of n-octane to ethylene and propylene，the conversion of n-octane on the flower⁃like ZSM-5 zeolite remained stable after 30 h continuous testing，and the total yield of ethylene and propylene was gradually increased from the initial 62.0% to 64.4%.The high catalytic activity and excellent anti⁃carbon stability of the flower⁃like ZSM-5 zeolite were mainly attributed to its unique layered morphology and hierarchical structure.
WANG Jianjie , SHU Xiaolong , XIAO Xia , WANG Peng , FAN Xiaoqiang , KONG Lian , XIE Zean , ZHAO Zhen . Study on synthesis of hierarchical flower⁃like ZSM-5 zeolite and its catalytic performance for n-octane cracking[J]. Inorganic Chemicals Industry, 2024 , 56(8) : 139 -146 . DOI: 10.19964/j.issn.1006-4990.2024-0050
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