全结晶纳米ZSM-5分子筛团聚体的合成及在甲苯甲基化中的应用

doi:10.19964/j.issn.1006-4990.2023-0545

Abstract

Abstract:

It is a great challenge to develop an efficient catalysts for the industrial application of toluene methanol alkylation technology to produce p-xylene.The holocrystalline nano-ZSM-5 aggregates were synthesized using ZSM-5 zeolites shaped by silica sol as the precursor by means of liquid phase crystallization.The characterization results showed that the amorphous SiO₂ species on the surface of shaped-ZSM-5 by silica sol were transformed into crystalline phase structure during recrystallization process.In addition to its inherent microporous pores，the formed HCZ₁₅₀ zeolite possessed abundant and uniform binary pore structure，concentrated at around 1.3 nm and 10 nm，with a total specific surface area of 260 m²/g and an external specific surface area of 72 m²/g，respectively.The evaluation results of toluenealkylation with methanol showed that the holocrystalline HCZ₁₅₀ zeolite had a p-xylene selectivity of 70%，which was significantly higher than that of SBZ₁₅₀ extruded with pseudo boehmite as binder.The P/HCZ₁₅₀ catalyst prepared by P₂O₅ modification exhibited a p-xylene selectivity of 90%，and there was no decrease in catalyst activity ever after 24 hours of reaction.The good stability was attributed to the rich pore structure and easy accessibility of active centers.A new approach for the preparation of toluene methylation catalysts was provided，which had certain guiding significance for the industrial application of this technology.

Key words: holycrystalline zeolte, nano-ZSM-5 aggregate, toluene alkylation with methanol, p-xylene

CLC Number:

O643.36

LI Yongheng, MI Xiaotong, ZHANG Peipei. Synthesis of holycrystalline nano-ZSM-5 aggregate and its application in methylation of toluene[J]. Inorganic Chemicals Industry, 2024, 56(5): 135-140.

Figures/Tables 7

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References 19

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样品	弱酸量/ （μmol·g^-1）	中强酸量/ （μmol·g^-1）	总酸量/ （μmol·g^-1）
Z₁₅₀	169.1	101.1	270.2
SBZ₁₅₀	112.4	68.7	181.1
SolZ₁₅₀	137.5	74.3	211.8
HCZ₁₅₀	148.2	90.5	238.7

[1]	Li Xiaoguo, Li Yongheng, Hou Zhanggui, Han Guodong, Xiao Jiawang, Gao Jinping, Chang Yang. Study on pilot catalytic performance of the modified catalyst for alkylation of toluene with methanol to p-xylene [J]. Inorganic Chemicals Industry, 2021, 53(3): 97-101.
[2]	FAN Jing-Xin, JING Wei-Dong, YU Hai-Bin, ZANG Jia-Zhong, XING Shu-Jian. Research progress in catalysts for selective alkylation of toluene and methanol [J]. INORGANICCHEMICALSINDUSTRY, 2013, 45(6): 62-.

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Inorganic Acid-Base-Salt Committee of CIESC

Synthesis of holycrystalline nano-ZSM-5 aggregate and its application in methylation of toluene

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