Highly Active Oxidation Catalysts through Confining Pd Clusters on CeO2 Nano‐Islands

Author:

Gashnikova Daria1ORCID,Maurer Florian1ORCID,Sauter Eric2ORCID,Bernart Sarah3ORCID,Jelic Jelena3ORCID,Dolcet Paolo14ORCID,Maliakkal Carina B.5ORCID,Wang Yuemin2ORCID,Wöll Christof2ORCID,Studt Felix3ORCID,Kübel Christian56ORCID,Casapu Maria1ORCID,Grunwaldt Jan‐Dierk13ORCID

Affiliation:

1. Institute for Chemical Technology and Polymer Chemistry (ITCP) Karlsruhe Institute of Technology (KIT) Engesserstraße 20 76131 Karlsruhe Germany

2. Institute of Functional Interfaces (IFG) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany

3. Institute of Catalysis Research and Technology (IKFT) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany

4. Current address: Department of Chemical Sciences University of Padova via Francesco Marzolo 1 35131 Padova Italy

5. Institute of Nanotechnology (INT) and Karlsruhe Nano Micro Facility (KNMFi) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany

6. Institute of Materials Research Technical University Darmstadt (TUDa) Peter-Grünberg-Straße 2 64287 Darmstadt Germany

Abstract

AbstractCeO2‐supported noble metal clusters are attractive catalytic materials for several applications. However, their atomic dispersion under oxidizing reaction conditions often leads to catalyst deactivation. In this study, the noble metal cluster formation threshold is rationally adjusted by using a mixed CeO2‐Al2O3 support. The preferential location of Pd on CeO2 islands leads to a high local surface noble metal concentration and promotes the in situ formation of small Pd clusters at a rather low noble metal loading (0.5 wt %), which are shown to be the active species for CO conversion at low temperatures. As elucidated by complementary in situ/operando techniques, the spatial separation of CeO2 islands on Al2O3 confines the mobility of Pd, preventing the full redispersion or the formation of larger noble metal particles and maintaining a high CO oxidation activity at low temperatures. In a broader perspective, this approach to more efficiently use the noble metal can be transferred to further systems and reactions in heterogeneous catalysis.

Funder

Deutsche Forschungsgemeinschaft

Fonds der Chemischen Industrie

Publisher

Wiley

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