One-pot synthesis of sheet-like MFI as high-performance catalyst for toluene disproportionation

研究成果: Article

摘要

In this study, one-pot hydrothermal synthesis of sheet-like ZSM-5 as a high-performance catalyst for toluene disproportionation was carried out using binary surfactants. In the dual template, tetraethylammonium hydroxide was used to construct the microporous structure of ZSM-5, and cationic surfactant (e.g., octadecyltrimethylammonium chloride (C18TMAC), hexadecyltrimethyl ammonium bromide (C16TMAB), and tetradecyltrimethylammonium bromide, (C14TMAB)) can change the growth habits of the ZSM-5 crystals by hindering the regular stacking of zeolite layers from their longer hydrophobic chain. From the XRD pattern of the as-synthesized samples which were hydrothermally treated for different time, it was found that a lamellar mesostructured intermediate gradually transformed into the sheet-like ZSM-5 during hydrothermal process. With a proper amount of cationic surfactant, the thickness of the sheet-like ZSM-5 could be controlled to less than 30 nm. Concerning the catalyst application, the toluene disproportionation performance over the sheet-like ZSM-5 is 1.5 times higher than that of the commercial ZSM-5. The higher conversion is ascribed to the faster diffusion amount due to the sheet-like ZSM-5.

原文English
頁(從 - 到)3719-3728
頁數10
期刊Journal of the American Ceramic Society
101
發行號8
DOIs
出版狀態Published - 2018 八月 1

指紋

Cationic surfactants
Toluene
toluene
surfactant
catalyst
bromide
Zeolites
Catalysts
Tetraethylammonium
Hydrothermal synthesis
Surface-Active Agents
Chlorides
Surface active agents
stacking
zeolite
Crystals
hydroxide
ammonium
X-ray diffraction
chloride

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

引用此文

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abstract = "In this study, one-pot hydrothermal synthesis of sheet-like ZSM-5 as a high-performance catalyst for toluene disproportionation was carried out using binary surfactants. In the dual template, tetraethylammonium hydroxide was used to construct the microporous structure of ZSM-5, and cationic surfactant (e.g., octadecyltrimethylammonium chloride (C18TMAC), hexadecyltrimethyl ammonium bromide (C16TMAB), and tetradecyltrimethylammonium bromide, (C14TMAB)) can change the growth habits of the ZSM-5 crystals by hindering the regular stacking of zeolite layers from their longer hydrophobic chain. From the XRD pattern of the as-synthesized samples which were hydrothermally treated for different time, it was found that a lamellar mesostructured intermediate gradually transformed into the sheet-like ZSM-5 during hydrothermal process. With a proper amount of cationic surfactant, the thickness of the sheet-like ZSM-5 could be controlled to less than 30 nm. Concerning the catalyst application, the toluene disproportionation performance over the sheet-like ZSM-5 is 1.5 times higher than that of the commercial ZSM-5. The higher conversion is ascribed to the faster diffusion amount due to the sheet-like ZSM-5.",
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AU - Hsu, Chun Han

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