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Selective Encapsulation of Metal and Metal Oxide Nanoparticles within Microporous Zeotype Frameworks via Hydrothermal Assembly in the Presence of Ligand-Protected Metal Cations
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Selective Encapsulation of Metal and Metal Oxide Nanoparticles within Microporous Zeotype Frameworks via Hydrothermal Assembly in the Presence of Ligand-Protected Metal Cations. |
| 개인저자 | Otto, Trenton. |
| 단체저자명 | University of California, Berkeley. Chemical Engineering. |
| 발행사항 | [S.l.]: University of California, Berkeley., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 224 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-03B. Dissertation Abstract International |
| ISBN | 9781085778763 |
| 학위논문주기 | Thesis (Ph.D.)--University of California, Berkeley, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-03, Section: B.
Advisor: Iglesia, Enrique. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | The encapsulation of metal nanoparticles within zeolitic voids of molecular dimensions protects metal surfaces from contact by reactant or poison species that are too large to enter framework apertures, and confers sinter-stability to confined metal domains via intervening channels that prevent cluster coalescence. Such channels can also stabilize specific transition states or retain undesired products until they fragment into smaller molecules capable of egress by diffusion. These size-selective properties are governed, in each instance, by the size of the microporous channels and voids in a specific framework. The encapsulation of noble metal (e.g., Au, Pd, Pt) clusters within small-pore (8-member ring (8-MR) apertures) and medium-pore (10-MR) zeolites, however, often cannot be achieved through established post-synthetic exchange or impregnation techniques, because solvated metal cations may be too large to enter the apertures of these zeolites. Base metal cations (e.g., Ni2+, Co2+, Fe2+), though generally small enough to enter even small-pore zeolites, tend to form highly refractory complexes when ion-exchanged, thus precluding their conversion into catalytically active metal or metal oxide particles by reductive or oxidative treatments. We have developed synthetic strategies and guiding principles for the successful preparation of Au and bimetallic (AuPd, AuPt, PdPt) nanoparticles within the microporous voids of zeolite or zeotype materials with medium (MFI, TS-1) and small (LTA) sized pores. Synthetic techniques have also been devised for the encapsulation of base metal oxide (NiO, Co3O4, Fe2O3) nanoparticles within large (FAU |
| 일반주제명 | Chemical engineering. Engineering. |
| 언어 | 영어 |
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