Nanoparticle Catalysis and Sintering Mechanisms

Nanoparticle catalysis harnesses the high surface‐to‐volume ratio and unique electronic properties of metal clusters in the 1–10 nm range to drive chemical transformations with enhanced activity, selectivity and atom efficiency. These catalysts underpin processes from fuel production and emission control to fine‐chemical synthesis. However, exposure to elevated temperatures or reactive atmospheres often induces sintering, in which individual particles grow or coalesce, diminishing their active surface area and leading to performance loss. Two principal sintering pathways are recognised: Ostwald ripening, where atoms detach from smaller particles and redeposit on larger ones, and diffusion‐controlled coalescence, whereby neighbouring particles migrate and merge. Strategies to mitigate sintering include engineering strong metal–support interactions, introducing dopants or surface ligands, spatial confinement in tailored architectures and dynamic redispersion under mild conditions. A detailed understanding of the interplay between particle size, interparticle distance and support chemistry is essential to design catalysts that combine high activity with sustained stability under realistic reaction conditions.

Research from Nature Portfolio

Recent studies have demonstrated scalable approaches to both stabilise and regenerate metal nanoparticles. One report describes the room‐temperature oxidative redispersion of sintered copper species via humid O₂ treatment, in which water molecules promote hydroxylated intermediates that mobilise and re‐disperse Cu atoms onto common oxide supports, restoring catalytic performance in CO oxidation and reverse water–gas shift reactions. Another investigation presents an interaction‐driven exsolution strategy to form finely dispersed Pt–Ni alloy nanoparticles on perovskite nanofibres, combining high‐temperature reduction with strong metal–support synergy to yield uniform bimetallic catalysts with superior activity and thermal resilience. A third contribution details a low‐temperature atomic diffusion method for producing subnanometric copper clusters on ceria, achieving remarkable selectivity in semi‐hydrogenation by balancing intermediate adsorption and H₂ dissociation, while the support confines cluster growth and prevents agglomeration.

Nanoparticle Catalysis and Sintering Mechanisms publication trend

The graph below shows the total number of articles in nanoparticle catalysis and sintering mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Ostwald ripening: A sintering mechanism in which atoms detach from smaller particles and redeposit onto larger ones, driven by differences in surface energy.

Diffusion and coalescence: A pathway whereby adjacent nanoparticles migrate across a support surface and merge into larger entities.

Redispersion: The process of breaking up or re‐mobilising agglomerated particles to restore a high degree of dispersion.

Metal–support interaction: The chemical and electronic coupling between metal nanoparticles and their substrate, which can stabilise or activate the catalyst.

Atomic diffusion: The migration of metal atoms from one location (for example, larger particles) to another (for example, support or smaller clusters) at low temperature.

References

1. Water-assisted oxidative redispersion of Cu particles through formation of Cu hydroxide at room temperature. Nature Communications (2024).
2. Synergistic growth of nickel and platinum nanoparticles via exsolution and surface reaction. Nature Communications (2024).
3. Scalable synthesis of Cu clusters for remarkable selectivity control of intermediates in consecutive hydrogenation. Nature Communications (2023).
4. Effective Prevention of Palladium Metal Particles Sintering by Histidine Stabilization on Silica Catalyst Support. Advanced Functional Materials (2024).
5. Direct Observation of Ni Nanoparticle Growth in Carbon-Supported Nickel under Carbon Dioxide Hydrogenation Atmosphere. ACS Nano (2023).