Spherical core-shell alumina support particles for model platinum catalysts.
Lisa Geerts1, Hannelore Geerts-Claes1, Alexander Skorikov2
1KU Leuven, Center for Surface Chemistry and Catalysis, Celestijnenlaan 200F, 3001 Leuven, Belgium. johan.martens@kuleuven.be.
Nanoscale
|February 15, 2021
Summary
Researchers developed novel spherical alumina core-shell particles, ideal for supporting highly dispersed platinum nanoparticles. This advancement facilitates bifunctional catalysis research by enabling individual component investigation.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Gamma-alumina (γ-alumina) and delta-alumina (δ-alumina) are widely used as catalyst supports.
- Developing supports for highly dispersed metal nanoparticles is crucial for catalytic efficiency.
Purpose of the Study:
- To synthesize spherical alumina core-shell particles for use as a model catalyst support.
- To achieve a homogeneous distribution of highly dispersed platinum nanoparticles on the alumina support.
- To enable individual investigation of catalytic components in bifunctional systems.
Main Methods:
- Hydrothermal synthesis of spherical alumina particles from aluminum nitrate and urea.
- Calcination at 1000 °C to form γ-alumina core and δ-alumina shell structure.
- Platinum (Pt) nanoparticle loading via strong electrostatic adsorption.
- Characterization using electron microscopy, energy dispersive X-ray spectroscopy, and 27Al magic angle spinning nuclear magnetic resonance spectroscopy.
Main Results:
- Successfully synthesized uniform spherical alumina particles (~1 μm) with a γ-alumina core and δ-alumina shell.
- Achieved homogeneous dispersion of sub-nanometer platinum nanoparticles (<1 nm) on the alumina surface.
- Demonstrated the utility of Pt/alumina spheres as a model catalyst for bifunctional catalysis studies.
Conclusions:
- The synthesized spherical alumina particles are excellent supports for highly dispersed platinum nanoparticles.
- This approach allows for the independent evaluation of catalytic functions in bifunctional systems, overcoming challenges with traditional supports.
- The well-characterized Pt/alumina spheres offer a versatile platform for designing and studying advanced catalysts.
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