多级孔花状ZSM-5分子筛的合成及其正辛烷催化裂解反应性能研究

doi:10.19964/j.issn.1006-4990.2024-0050

Abstract

Abstract:

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（C_18-6-6Br₂）∶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.

Key words: light olefins, hierarchical, ZSM-5 zeolite, catalytic cracking, crystallization condition

CLC Number:

TQ426

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.

Figures/Tables 14

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Study on synthesis of hierarchical flower⁃like ZSM-5 zeolite and its catalytic performance for n-octane cracking

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