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Updated: Oct 10, 2025
Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Dynamic restructuring of supported metal nanoparticles and its implications for structure insensitive catalysis
Charlotte Vogt1,2, Florian Meirer1, Matteo Monai1
1Inorganic Chemistry and Catalysis group, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands.
Structure insensitive reactions may not be truly insensitive. Ethene hydrogenation on nickel nanoparticles causes restructuring, making CO2 hydrogenation appear structure insensitive, challenging fundamental catalysis understanding.
Area of Science:
- Catalysis
- Materials Science
- Surface Chemistry
Background:
- Fundamental concepts in catalysis, such as structure insensitivity, are crucial for developing advanced catalysts but remain incompletely understood.
- Structure insensitive reactions are defined by constant surface-normalized activity irrespective of catalyst metal particle size.
Purpose of the Study:
- To investigate the concept of structure insensitivity and its relationship with surface reconstruction in silica-supported nickel (Ni) metal nanoparticles.
- To differentiate between structure sensitive (CO2 hydrogenation) and structure insensitive (ethene hydrogenation) reactions on Ni nanoparticles of varying sizes (1-6 nm).
Main Methods:
- Utilized advanced techniques including in-situ scanning transmission electron microscopy (STEM) and rapid X-ray absorption spectroscopy (XAS) with sub-second resolution.
- Spectroscopically analyzed the behavior of Ni nanoparticles during ethene and CO2 hydrogenation reactions.
Main Results:
- Observed particle size-dependent restructuring effects, with increased restructuring and faster rates on larger Ni nanoparticles during ethene hydrogenation.
- Found no significant restructuring effects during CO2 hydrogenation.
- Demonstrated that restructuring induced by ethene hydrogenation can be irreversible and that carbon diffusion rates increase with particle size.
- Showed that ethene hydrogenation can render the structure sensitive CO2 hydrogenation reaction apparently structure insensitive.
Conclusions:
- Postulate that "structure insensitive" reactions are, in fact, apparently structure insensitive due to dynamic surface processes like restructuring.
- This finding necessitates a re-evaluation of the fundamental understanding of structure insensitivity in heterogeneous catalysis.
- Particle size-dependent restructuring and carbon diffusion play critical roles in observed catalytic behaviors.
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