Synthesis of Short, Needle-Shaped Crystals of TON-Type Zeolite by Addition of Inhibitors of Crystal Growth along the [001] Direction

Masaki Okamoto, Yohei Nishimura, Miyuki Takahashi, Wei Hung Chen

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

TON-type zeolite crystals in the shape of short needles were synthesized using inhibitors of crystal growth along the [001] direction. When fluoride was used as a mineralizer, bulky amines incorporating structure-directing agents acted as inhibitors, while nonionic surfactants were more effective as inhibitors for decreasing the crystal length of TON-type zeolite. The amount of surfactant adsorbed on the zeolite increased with the surface area of the face containing pore mouths. This indicates that the surfactant was trapped in the pore mouths to inhibit crystal growth along the long axis of the needle-shaped crystals. By microscopic observation of the crystals, we confirmed inhibition of crystal growth by adsorption of the surfactant. After adsorption of Nile red, a lipophilic stain that is intensely fluorescent in surfactants, on as-synthesized zeolite, only the edges of the needle-shaped crystals were luminous, also indicating adsorption of the surfactant in pore mouths. When hydroxide was used as a mineralizer, the bulky amines acted as inhibitors. Nonionic surfactants, however, did not work. We used the obtained shorter crystals of TON-type zeolites as catalysts for hydroisomerization of n-tetradecane. Use of the shorter crystals improved the selectivity for skeletal isomerization.

Original languageEnglish
Pages (from-to)6573-6580
Number of pages8
JournalCrystal Growth and Design
Volume18
Issue number11
DOIs
Publication statusPublished - 2018 Nov 7
Externally publishedYes

Fingerprint

Zeolites
Crystallization
Crystal growth
needles
Needles
inhibitors
crystal growth
surfactants
Surface-Active Agents
Crystals
Surface active agents
synthesis
mouth
crystals
Nonionic surfactants
porosity
Adsorption
adsorption
Amines
amines

ASJC Scopus subject areas

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

Cite this

Synthesis of Short, Needle-Shaped Crystals of TON-Type Zeolite by Addition of Inhibitors of Crystal Growth along the [001] Direction. / Okamoto, Masaki; Nishimura, Yohei; Takahashi, Miyuki; Chen, Wei Hung.

In: Crystal Growth and Design, Vol. 18, No. 11, 07.11.2018, p. 6573-6580.

Research output: Contribution to journalArticle

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