Low-temperature atomic layer deposition delivers more active and stable Pt-based catalysts
Hao Van Bui1, Fabio Grillo, Sri Sharath Kulkarni
1Department of Chemical Engineering, Delft University of Technology, 2628 BL, Delft, The Netherlands. f.grillo@tudelft.nl.
Nanoscale
|July 21, 2017
Summary
Low-temperature atomic layer deposition creates highly active and stable platinum nanoparticles on graphene for propene oxidation. This method ensures consistent catalytic performance even after prolonged high-temperature exposure.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Controlling nanoparticle size distribution is crucial for catalytic activity and stability.
- Atomic layer deposition (ALD) offers precise control over nanoparticle synthesis.
- Fluidized bed reactors enable scalable nanoparticle production.
Purpose of the Study:
- To tailor the size distribution of platinum nanoparticles (NPs) on graphene nanoplatelets.
- To investigate the catalytic activity and stability of Pt NPs synthesized via low-temperature ALD.
- To establish a scalable method for producing stable supported Pt NPs with controlled size.
Main Methods:
- Utilized low-temperature atomic layer deposition (ALD) in a fluidized bed reactor at atmospheric pressure.
- Deposited platinum nanoparticles (NPs) on graphene nanoplatelets at 100 °C and 250 °C.
- Evaluated catalytic performance in propene oxidation reactions and assessed stability at high temperatures (>450 °C).
Main Results:
- Pt NPs deposited at 100 °C exhibited higher activity and stability in propene oxidation compared to high-temperature counterparts.
- The enhanced catalytic performance of low-temperature deposited NPs was maintained after >24 hours at 450 °C.
- Pt NPs synthesized at 100 °C retained a narrower size distribution than those synthesized at 250 °C, correlating with more facet sites.
Conclusions:
- Low-temperature ALD in a fluidized bed reactor provides a scalable route for synthesizing stable Pt NPs with tailored size distributions.
- The developed method enables precise control over nanoparticle morphology, leading to improved catalytic performance and stability.
- This approach facilitates the study of structure-function relationships in supported metal nanoparticles.
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