Modification and catalyst performance of ZSM-5 zeolite by treatment with TPAOH/NaOH mixed alkali

LI Sha; LI Yu-ping; DI Chun-yu; ZHANG Peng-fei; PAN Rui-li; DOU Tao

Volume 40 Issue 05

May 2012

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Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > 40(05): 583-588

LI Sha, LI Yu-ping, DI Chun-yu, ZHANG Peng-fei, PAN Rui-li, DOU Tao. Modification and catalyst performance of ZSM-5 zeolite by treatment with TPAOH/NaOH mixed alkali[J]. Journal of Fuel Chemistry and Technology, 2012, 40(05): 583-588.

Citation:

LI Sha, LI Yu-ping, DI Chun-yu, ZHANG Peng-fei, PAN Rui-li, DOU Tao. Modification and catalyst performance of ZSM-5 zeolite by treatment with TPAOH/NaOH mixed alkali[J]. Journal of Fuel Chemistry and Technology, 2012, 40(05): 583-588.

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Modification and catalyst performance of ZSM-5 zeolite by treatment with TPAOH/NaOH mixed alkali

1.
Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, China;
2.
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
3.
Institute of Chemical and Biological Technology, Taiyuan University of Science and Technology, Taiyuan 030024, China;
4.
College of Chemical Engineering, China University of Petroleum(Beijing), Beijing 102249, China

Funds: 国家重点基础研究发展规划(973计划,2004CB217806);国家自然科学基金(20973123)。

Received Date: 2011-07-03
Rev Recd Date: 2011-09-28
Publish Date: 2012-05-31

Abstract

Abstract

The composites with mesoporous and microporous structure were obtained by treatment of ZSM-5 zeolite in mixed alkali aqueous solution of tetrapropylammonium hydroxide and inorganic base NaOH. The products were characterized by XRD, N₂-adsorption/desorption, NH₃-TPD, SEM and so on. The results showed that the alkaline solution would cause the zeolite desilication and dealumination and either decreasing the TPA⁺/OH^- ratio or prolonging the alkali treatment time will cause reduction of micropore structure and increasement of mesopore amount increasingly while keeping the concentration of OH^- at a fixed value. And meanwhile, the treatment also changed the acidity of zeolite. Mixed alkali treatment with proper TPA⁺/OH^-ratio could preserve micropore structure to the maximum extent while formed the mesopore, reduce zeolite’s strong acid quantity and increase the selectivity of propylene when performanced on methanol-to-olefins (MTO) reaction. Compared with the inorganic base NaOH, the modification rate of zeolite by TPAOH was slower, milder and more controllable that could act as pore-growth moderator.
- mesopore,
- zeolite,
- ZSM-5,
- alkali treatment,
- MTO

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References(16)

References

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