1. Low-temperature atomic layer deposition delivers more active and stable Pt-based catalysts
- Author
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Michiel Makkee, Fabio Grillo, Michiel T. Kreutzer, Nguyen Van Thang, Bart van der Linden, Jacob A. Moulijn, Hao Van Bui, Ronald Bevaart, J. Ruud van Ommen, and Sri Sharath Kulkarni
- Subjects
Materials science ,Atmospheric pressure ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Redox ,0104 chemical sciences ,Catalysis ,Metal ,Propene ,chemistry.chemical_compound ,Atomic layer deposition ,Chemical engineering ,chemistry ,13. Climate action ,Pt based catalysts ,Fluidized bed ,visual_art ,visual_art.visual_art_medium ,General Materials Science ,0210 nano-technology - 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.
- Published
- 2017