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Mesopore expansion of surfactant-directed nanomorphic zeolites with trimethylbenzene

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Title
Mesopore expansion of surfactant-directed nanomorphic zeolites with trimethylbenzene
Author(s)
Changbum Jo; Jinhwan Jung; Ryong Ryoo
Publication Date
2014-08
Journal
MICROPOROUS AND MESOPOROUS MATERIALS, v.194, no., pp.83 - 89
Publisher
ELSEVIER SCIENCE BV
Abstract
The synthesis of zeolite using multiammonium surfactants as the hierarchical structure-directing agent has been investigated with a particular focus on mesopore expansion by trimethylbenzene (TMB) addition during the synthesis of nanosponge beta, MTW and MRE zeolites. The results showed that mesopore diameters of these zeolites could be increased according to the amount of TMB added to the zeolite synthesis reaction mixture but only when the Na + content was sufficiently high. The expansion was reversed when the synthesis mixture was reheated following TMB removal by solvent extraction. The thickness of the mesopore walls did not change during the consecutive pore expansion and shrinking processes. A transmission electron microscopic investigation revealed that the process is likely occurring through recrystallization of the zeolite frameworks, as promoted by Na+. The mesopore diameter of the nanosponge beta zeolite could be increased to 15 nm using this method. This zeolite exhibited four times the adsorption capacity for lysozyme (molecular dimension: 2.0 × 2.5 × 4.3 nm3) at 298 K, compared to the TMB-untreated zeolite, which possessed 3.8 nm mesopores. © 2014 Elsevier Inc. All rights reserved.
URI
https://pr.ibs.re.kr/handle/8788114/953
ISSN
1387-1811
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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