Zeolite Synthesis Using Hierarchical Structure-Directing Surfactants: Retaining Porous Structure of Initial Synthesis Gel and Precursors

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Zeolite beta with a mesopore-micropore hierarchy is hydrothermally synthesized here using various surfactants that can function as a hierarchical structure-directing agent at both the meso- and microstructural levels. Tetraethoxysilane and diatomaceous earth were tested as the silica sources. The pore size distribution of the zeolite was analyzed by N-2 adsorption and electron microscopy. The result was related to the surfactant structure, silica source, and Na+ concentration. The zeolite showed quite uniform mesopores corresponding to the surfactant micelles, in addition to zeolitic micropores generated by the surfactant head groups. Furthermore, an additional level of large pores (>= 20 nm) could be obtained as a result of the retaining of pores from the initial synthesis gel or the zeolite precursor. The large pores were fully retained when the silica source was transformed into a crystalline zeolite via pseudomorphic transformation without migration into the solution phase. The transformation could be controlled by the choice of the synthesis conditions and surfactants. The resultant zeolite with a macropore-mesopore-micropore hierarchy shows potential applicability where facile diffusion is required.
Publisher
AMER CHEMICAL SOC
Issue Date
2012
Language
English
Article Type
Article
Keywords

MESOPOROUS MOLECULAR-SIEVES; CUBIC-P-ZEOLITE; ORGANOSILANE SURFACTANT; HYDROTHERMAL SYNTHESIS; MFI; CONVERSION; NANOSHEETS; CATALYSTS; ARCHITECTURES; GENERATION

Citation

CHEMISTRY OF MATERIALS, v.24, no.14, pp.2733 - 2738

ISSN
0897-4756
DOI
10.1021/cm300841v
URI
http://hdl.handle.net/10203/102280
Appears in Collection
CH-Journal Papers(저널논문)
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