MFI-type zeolite with a core-shell structure with minimal defects synthesized by crystal overgrowth of aluminum-free MFI-type zeolite on aluminum-containing zeolite and its catalytic performance

Masaki Okamoto, Yukio Osafune

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

MFI-type zeolite with a core-shell structure and minimal defects was synthesized by crystal overgrowth of aluminum-free MFI-type zeolite on aluminum-containing MFI-type zeolite crystals. The purpose of the zeolite shell is to passivate acid sites on the external surface of the zeolite core. When both the shell and the core are synthesized in the presence of fluoride ion, defects are minimal. In the case of synthesizing the shell in the absence of fluoride ion, core growth does not occur. When the core is synthesized in the absence of fluoride ion, significant defects develop and cause mesopores to form in the core-shell zeolite. As catalysts for methylation of toluene with methanol, only the core-shell zeolite with minimal defects shows high selectivity for p-xylene (96%).

Original languageEnglish
Pages (from-to)413-418
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume143
Issue number2-3
DOIs
Publication statusPublished - 2011 Sep 1
Externally publishedYes

Fingerprint

Zeolites
Aluminum
aluminum
Defects
Crystals
defects
crystals
Fluorides
Ions
fluorides
Methylation
Xylene
Toluene
Methanol
ions
methylation
xylene
Catalysts
Acids
toluene

Keywords

  • Core-shell structure
  • Defect-free
  • External surface passivation
  • Fluoride ion
  • Methylation

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

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abstract = "MFI-type zeolite with a core-shell structure and minimal defects was synthesized by crystal overgrowth of aluminum-free MFI-type zeolite on aluminum-containing MFI-type zeolite crystals. The purpose of the zeolite shell is to passivate acid sites on the external surface of the zeolite core. When both the shell and the core are synthesized in the presence of fluoride ion, defects are minimal. In the case of synthesizing the shell in the absence of fluoride ion, core growth does not occur. When the core is synthesized in the absence of fluoride ion, significant defects develop and cause mesopores to form in the core-shell zeolite. As catalysts for methylation of toluene with methanol, only the core-shell zeolite with minimal defects shows high selectivity for p-xylene (96{\%}).",
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