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2D-to-3D zeolite transformation for the preparation of Pd@MWW catalysts with tuneable acidity

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F22%3A10443956" target="_blank" >RIV/00216208:11310/22:10443956 - isvavai.cz</a>

  • Result on the web

    <a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=dSLfD8jjMb" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=dSLfD8jjMb</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.cattod.2021.11.041" target="_blank" >10.1016/j.cattod.2021.11.041</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    2D-to-3D zeolite transformation for the preparation of Pd@MWW catalysts with tuneable acidity

  • Original language description

    2D-to-3D transformation of layered zeolite precursors (e.g., MCM-22 P, IPC-1 P, pre-FER) into three-dimensional frameworks in combination with metal encapsulation has been recently shown as efficient synthetic strategy to stabilize metal clusters in a zeolite matrix. Even though, tailoring the number of acid sites in a zeolite support and its effect on the properties of thus prepared metal@zeolite materials (e.g., metal dispersion and catalytic activity) remained unrevealed. Herein, we report on the synthesis of Pd@MCM-22 catalysts via modified 2D-to-3D transformation method, which allows to achieve close to nominal loading of noble metal (e.g., 0.1, 0.3, 0.8 wt%) by time-separation of swelling of MCM-22 P layered zeolite precursor and subsequent incorporation with metal. In turn, alternating Si/Al ratio of MCM-22 P (e.g., SiAl = 15, 20, 30) enabled the preparation of Pd@MCM22 catalysts with variable concentration of acid sites (0.28 - 0.55 mmol/g), while not affecting the Pd dispersion. Decrease in Pd dispersion with increasing metal loading was accompanied with declining catalytic activity in a model reaction of selective hydrogenation of nitro-group in 3-nitrotoluene: 0.1 wt% Pd {dispersion = 52.6%, reaction rate = 21.2 mol.g(-1)Pd.h(-1)} &gt; 0.3 wt% Pd {9.6 mol.g(-1)Pd.h(-1)} &gt; 0.8 wt% Pd {23.2%, 3.7 mol.g(-1)Pd.h(-1)}. The results of this study reveal that the reported synthesis strategy can be successfully used to confine small metal nanoparticles in a zeolite matrix while tuning its acidic characteristics for designing bifunctional metal acidic catalysts.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10403 - Physical chemistry

Result continuities

  • Project

    Result was created during the realization of more than one project. More information in the Projects tab.

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2022

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Catalysis Today

  • ISSN

    0920-5861

  • e-ISSN

    1873-4308

  • Volume of the periodical

    390-391

  • Issue of the periodical within the volume

    May

  • Country of publishing house

    NL - THE KINGDOM OF THE NETHERLANDS

  • Number of pages

    8

  • Pages from-to

    109-116

  • UT code for WoS article

    000783098100004

  • EID of the result in the Scopus database

    2-s2.0-85120658243