Stabilization of metal nanoparticles in MWW zeolite for catalytic applications
Stabilizace kovových nanočástic v zeolitu MWW pro katalytické aplikace
bakalářská práce (OBHÁJENO)
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Trvalý odkaz
http://hdl.handle.net/20.500.11956/128279Identifikátory
SIS: 218301
Kolekce
- Kvalifikační práce [19598]
Autor
Vedoucí práce
Konzultant práce
Čejka, Jiří
Opanasenko, Maksym
Oponent práce
Hronec, Mlan
Fakulta / součást
Přírodovědecká fakulta
Obor
Klinická a toxikologická analýza
Katedra / ústav / klinika
Katedra fyzikální a makromol. chemie
Datum obhajoby
12. 7. 2021
Nakladatel
Univerzita Karlova, Přírodovědecká fakultaJazyk
Angličtina
Známka
Výborně
Klíčová slova (česky)
zeolity, kovové nanočástice, heterogenní katalyzátory, design materiálůKlíčová slova (anglicky)
zeolite, metal nanoparticles, heterogeneous catalysts, material designControlling both size of metal nanoparticles (MNPs) and acidobasic characteristics of the zeolite support is highly desirable for preparation of stable and active bifunctional catalysts. 2D-3D transformation of layered zeolite precursor into three-dimensional zeolite coupled with metal encapsulation is one of the most efficient synthetic strategies so far to achieve the appropriate metal dispersion and aggregative stability of MNPs within zeolite matrix. Nevertheless, the effect of support acidic characteristics on the properties of thus prepared metal@zeolite catalyst remained unrevealed, while the synthetic strategy itself requires further optimization to minimize the loss of metal component. This work addresses the influence of chemical composition of zeolite layered precursor on physical-chemical and catalytic properties of metal@zeolite catalysts prepared via 2D-3D transformation strategy, taken Pd@MCM-222D-3D system as a representative example. Both Si/Al ratio of MCM-22P layered precursor (e.g., Si/Al = 15, 20, 30) and Pd loading (e.g., 0.1, 0.3, 0.8 wt.%) were varied resulting in a set of nine Pd@MCM-222D-3D catalysts. In addition, three Pd@MCM-22impreg catalysts with the same metal loading (0.1 wt.%), but different Si/Al ratios of a support were synthesized via conventional impregnation...