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| Type |
Symposium |
| Area |
[Inorganic Chemistry - Materials Chemistry Divisions Joint Symposium] New Horizons in Inorganic Nanomaterials |
| Room No. |
401호 |
| Time |
THU 13:30-: |
| Code |
IOMT-1 |
| Subject |
Mesoporous zeolite catalysts |
| Authors |
유 룡*, 조창범, 신혜선1, 조장근1, 좌진용1
기초과학연구원 나노물질및화학반응연구단, Korea
1KAIST 화학과, Korea
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| Abstract |
Zeolites are a family of microporous crystalline aluminosilicates, which are very important in catalysis. Over the past decades, microporosity was the main focus of the zeolite catalysis. Strong acid sites located on the micropore walls were the catalytic active sites for alkylation, isomerization, and cracking. The zeolite micropores were also supported with various kinds of transition metal catalysts to use in dehydrogenation, hydrogenation and oxidation. But since the discovery of MCM-41 mesoporous silica, mesoporosity emerged as a topic of interest in zeolite catalysis. Particularly in recent years, various types of microporous zeolite could be synthesized with a highly mesoporous morphology, using surfactants that were functionalized with zeolite structure-directing agents. Mesopores in these zeolites were disordered and interconnected to each other in a manner reminiscent of nanosponges. Despite the pore disorder, the zeolite nanosponges exhibited a narrow distribution of mesopore diameters, and also a large mesopore volume comparable to that of MCM-41. The mesopore walls in the zeolite nanosponges were ultrathin frameworks of microporous crystalline zeolite, and the wall surfaces possessed strong acid sites. The internal micropores inside the mesopore walls were accessible through apertures on the wall surfaces, resulting in rapid diffusion of reactants.
This lecture begins with an overview of recent progress in the synthesis of mesoporous materials composed of microporous crystalline wall structures, using zeolite structure-directing surfactants. Then, we move to the characterization of acid catalytic properties of the mesoporous zeolites. Finally, we present new exciting results obtained by supporting transition metal catalysts in the zeolite mesopores.
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| E-mail |
rryoo@kaist.ac.kr |
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119th General Meeting of the KCS