Low-temperature atomic layer deposition delivers more active and stable Pt-based catalysts
V.H. Bui (TU Delft - ChemE/Product and Process Engineering)
Fabio Grillo (TU Delft - ChemE/Product and Process Engineering)
Sri Sharath Kulkarni (TU Delft - ChemE/Product and Process Engineering)
Ronald Bevaart (Student TU Delft)
V.T. Nguyen (TU Delft - RST/Fundamental Aspects of Materials and Energy)
B van der Linden (TU Delft - ChemE/O&O groep)
J.A. Moulijn (TU Delft - ChemE/Catalysis Engineering)
M Makkee (TU Delft - ChemE/Catalysis Engineering)
M.T. Kreutzer (TU Delft - ChemE/Chemical Engineering)
J. R. Van Ommen (TU Delft - ChemE/Product and Process Engineering)
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Abstract
We tailored the size distribution of Pt nanoparticles (NPs) on graphene nanoplatelets at a given metal loading by using low-temperature atomic layer deposition carried out in a fluidized bed reactor operated at atmospheric pressure. The Pt NPs deposited at low temperature (100 °C) after 10 cycles were more active and stable towards the propene oxidation reaction than their high-temperature counterparts. Crucially, the gap in the catalytic performance was retained even after prolonged periods of time (>24 hours) at reaction temperatures as high as 450 °C. After exposure to such harsh conditions the Pt NPs deposited at 100 °C still retained a size distribution that is narrower than the one of the as-synthesized NPs obtained at 250 °C. The difference in performance correlated with the difference in the number of facet sites as estimated after the catalytic test. Our approach provides not only a viable route for the scalable synthesis of stable supported Pt NPs with tailored size distributions but also a tool for studying the structure-function relationship.
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