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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Catalysis Today

ISSN

0920-5861

e-ISSN

1873-4308

Svazek periodika

390-391

Číslo periodika v rámci svazku

May

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

109-116

Kód UT WoS článku

000783098100004

EID výsledku v databázi Scopus

2-s2.0-85120658243