Alkali-treatment technique - New method for modification of structural and acid-catalytic properties of ZSM-5 zeolites

Masaru Ogura; Shin Ya Shinomiya; Junko Tateno; Yasuto Nara; Mikihiro Nomura; Eiichi Kikuchi; Masahiko Matsukata

doi:10.1016/S0926-860X(01)00645-7

Alkali-treatment technique - New method for modification of structural and acid-catalytic properties of ZSM-5 zeolites

Masaru Ogura, Shin Ya Shinomiya, Junko Tateno, Yasuto Nara, Mikihiro Nomura, Eiichi Kikuchi, Masahiko Matsukata^*

^*Corresponding author for this work

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

459 Citations (Scopus)

Abstract

ZSM-5 zeolite having a SiO₂/Al₂O₃ molar ratio of 39.4 was treated in a NaOH alkali solution and the changes in structural and acidic properties were investigated. A siliceous species was selectively dissolved from the framework of zeolite, although a lower amount of Al was also eluted. In this procedure, mesopores with a uniform size were formed on the zeolite, while the microporous structure remained. The acidic property was changed very little quantitatively or qualitatively, even though the catalytic activity for cracking of cumene was enhanced by the alkali-treatment. This can be explained by the facts that adsorptive and diffusive properties of cumene through micropores of the ZSM-5 are increased by the creation of mesopores.

Original language	English
Pages (from-to)	33-43
Number of pages	11
Journal	Applied Catalysis A: General
Volume	219
Issue number	1-2
DOIs	https://doi.org/10.1016/S0926-860X(01)00645-7
Publication status	Published - 2001 Oct 5

Keywords

Acidity
Alkali-treatment
Mesopore
ZSM-5

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

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10.1016/S0926-860X(01)00645-7

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title = "Alkali-treatment technique - New method for modification of structural and acid-catalytic properties of ZSM-5 zeolites",

abstract = "ZSM-5 zeolite having a SiO2/Al2O3 molar ratio of 39.4 was treated in a NaOH alkali solution and the changes in structural and acidic properties were investigated. A siliceous species was selectively dissolved from the framework of zeolite, although a lower amount of Al was also eluted. In this procedure, mesopores with a uniform size were formed on the zeolite, while the microporous structure remained. The acidic property was changed very little quantitatively or qualitatively, even though the catalytic activity for cracking of cumene was enhanced by the alkali-treatment. This can be explained by the facts that adsorptive and diffusive properties of cumene through micropores of the ZSM-5 are increased by the creation of mesopores.",

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AU - Ogura, Masaru

AU - Shinomiya, Shin Ya

AU - Tateno, Junko

AU - Nara, Yasuto

AU - Nomura, Mikihiro

AU - Kikuchi, Eiichi

AU - Matsukata, Masahiko

PY - 2001/10/5

Y1 - 2001/10/5

N2 - ZSM-5 zeolite having a SiO2/Al2O3 molar ratio of 39.4 was treated in a NaOH alkali solution and the changes in structural and acidic properties were investigated. A siliceous species was selectively dissolved from the framework of zeolite, although a lower amount of Al was also eluted. In this procedure, mesopores with a uniform size were formed on the zeolite, while the microporous structure remained. The acidic property was changed very little quantitatively or qualitatively, even though the catalytic activity for cracking of cumene was enhanced by the alkali-treatment. This can be explained by the facts that adsorptive and diffusive properties of cumene through micropores of the ZSM-5 are increased by the creation of mesopores.

AB - ZSM-5 zeolite having a SiO2/Al2O3 molar ratio of 39.4 was treated in a NaOH alkali solution and the changes in structural and acidic properties were investigated. A siliceous species was selectively dissolved from the framework of zeolite, although a lower amount of Al was also eluted. In this procedure, mesopores with a uniform size were formed on the zeolite, while the microporous structure remained. The acidic property was changed very little quantitatively or qualitatively, even though the catalytic activity for cracking of cumene was enhanced by the alkali-treatment. This can be explained by the facts that adsorptive and diffusive properties of cumene through micropores of the ZSM-5 are increased by the creation of mesopores.

KW - Acidity

KW - Alkali-treatment

KW - Mesopore

KW - ZSM-5

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Alkali-treatment technique - New method for modification of structural and acid-catalytic properties of ZSM-5 zeolites

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

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