Nanowire network catalysts embedded in the mesopore network of zeolite = 제올라이트의 메조다공망에 촉매를 삼차원 연결 구조로 담지시키는 연구

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Loading a large amount of catalyst on a support is desirable in order to obtain a high catalytic activity, but but in general at high loading, the increased amount of catalyst is dissipated by the decrease of catalyst dispersion due to agglomeration. This thesis demonstrates that this problem is remarkably diminished if we support metals or metal oxide catalysts in zeolites that possess mesopores and micropores in a hierarchical manner. Under this purpose, two hierarchically nanoporous zeolites, beta and MFI, were synthesized using surfactants which were functionalized with the corresponding zeolite structure-directing agents. These zeolites were supported with Co up to 50 wt% using a proper impregnation method. The Co-supporting zeolites exhibited the formation of Co nanowire networks inside the zeolite mesopore network. Although most of the Co surfaces were inaccessible through the mesopores, the zeolitic micropore windows on the mesopore walls allowed access to surfaces of the Co nanowires. As a result, the hierarchically nanoporous zeolites with high Co loading exhibited far superior catalytic activities for Fischer-Tropsch synthesis to other porous materials supporting Co such as bulk zeolites (i.e., solely microporous zeolites), mesoporous silica MCM-41, MCM-48, and γ-alumina. Further, the present concept of catalyst loading on hierarchically porous zeolites have been expanded to the hydrogenation of benzene using supported Ni catalyst, and the transfer hydrogenation of furfural over zeolite-supported $TiO_2$ catalyst.
Advisors
Ryoo, Ryongresearcher유룡researcher
Description
한국과학기술원 :화학과,
Publisher
한국과학기술원
Issue Date
2020
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학과, 2020.8,[v, 99 p. :]

Keywords

hierarchical zeolite▼asupported catalyst▼amesopore network▼ananowire network▼ahigh loading; 고성능 불균일계 촉매▼a고담지 촉매▼a메조다공망▼a위계다공성 제올라이트▼a나노선 네트워크

URI
http://hdl.handle.net/10203/284389
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=924434&flag=dissertation
Appears in Collection
CH-Theses_Ph.D.(박사논문)
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