Size-controllable synthesis of ZSM-5 molecular sieves and their catalytic performance in the conversion of methanol to hydrocarbons

XU Feng; DONG Mei; GOU Wei-yong; HUANG Li-zhi; LI Jun-fen; FAN Wei-bin; QIN Zhang-feng; WANG Jian-guo

Volume 40 Issue 05

May 2012

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Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > 40(05): 576-582

XU Feng, DONG Mei, GOU Wei-yong, HUANG Li-zhi, LI Jun-fen, FAN Wei-bin, QIN Zhang-feng, WANG Jian-guo. Size-controllable synthesis of ZSM-5 molecular sieves and their catalytic performance in the conversion of methanol to hydrocarbons[J]. Journal of Fuel Chemistry and Technology, 2012, 40(05): 576-582.

Citation:

XU Feng, DONG Mei, GOU Wei-yong, HUANG Li-zhi, LI Jun-fen, FAN Wei-bin, QIN Zhang-feng, WANG Jian-guo. Size-controllable synthesis of ZSM-5 molecular sieves and their catalytic performance in the conversion of methanol to hydrocarbons[J]. Journal of Fuel Chemistry and Technology, 2012, 40(05): 576-582.

Citation:

XU Feng, DONG Mei, GOU Wei-yong, HUANG Li-zhi, LI Jun-fen, FAN Wei-bin, QIN Zhang-feng, WANG Jian-guo. Size-controllable synthesis of ZSM-5 molecular sieves and their catalytic performance in the conversion of methanol to hydrocarbons[J]. Journal of Fuel Chemistry and Technology, 2012, 40(05): 576-582.

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Size-controllable synthesis of ZSM-5 molecular sieves and their catalytic performance in the conversion of methanol to hydrocarbons

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2.
Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
3.
Shenhua Ningxia Coal Industry Group Chemical Industry Company, Yingchuan 750411, China

Funds: 国家重点基础研究发展规划(973计划,2010CB234603,2011CB201403);国家自然科学基金(10979068,21003148)。

Received Date: 2011-06-13
Rev Recd Date: 2011-09-01
Publish Date: 2012-05-31

Abstract

Abstract

ZSM-5 molecular sieves with a uniform particle size from 0.1 to 14 μm were hydrothermally synthesized by using tetrapropylammonium hydroxide (TPAOH) as the template and polyethylene glycol (PEG) as a co-template. The ZSM-5 samples were characterized by XRD, SEM, BET, Py-IR, NH₃-TPD and ICP and their catalytic performance in the conversion of methanol to hydrocarbons were investigated. The results indicated that the crystal size of ZSM-5 molecular sieves can be regulated by adjusting the quantity of PEG, silica source and water content in the precursor gel as well as controlling the aging and crystallizing conditions. The ZSM-5 molecular sieves with smaller crystal sizes exhibit higher conglomeration degree, Si/Al ratio and surface area than those with large crystal sizes, but lower crystallinity, BrØnsted acid density and total acid quantity. When used as the catalysts in methanol conversion to hydrocarbons, the crystal size of ZSM-5 molecular sieves has a significant effect on their catalytic stability and the products distribution. The catalyst with smaller crystal size shows much higher stability and selectivity to the light alkanes of C₁～C₄; an increase in the crystal size can enhance the formation of C₅⁺ and aromatic products but lead to a significant decline in its stability.
- ZSM-5,
- crystal size,
- methanol conversion,
- hydrocarbons,
- catalyst stability,
- product distribution

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References(24)

References

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