Nanoparticle Catalysis in Heterogeneous Systems

Nanoparticle catalysis in heterogeneous systems harnesses the distinctive properties of metal or metal‐oxide particles in the 1–100 nm range to drive surface‐mediated chemical reactions. By virtue of their high surface‐to‐volume ratio, quantum‐confined electronic states and tunable surface chemistry, nanoparticles enable enhanced activity, selectivity and stability in processes spanning hydrogenation, oxidation, carbon–carbon coupling and environmental remediation. Control over particle size, shape, composition and support interactions allows precise tailoring of active site ensembles, from isolated atoms to multi‐metallic clusters. Advances in in situ and operando characterisation have revealed dynamic restructuring of nanoparticle surfaces under reaction conditions, emphasising the importance of reversible atomic migration, alloy formation and re‐dispersion pathways. These developments underpin sustainable chemical manufacture, clean‐energy conversion and pollution abatement, with applications in automobile emission control, fuel cells, biomass valorisation and fine‐chemical synthesis. Ongoing efforts focus on stabilising single‐atom sites, understanding deactivation mechanisms, and integrating data‐driven design to accelerate discovery of next‐generation heterogeneous catalysts.

Research from Nature Portfolio

Recent studies have decoded the nature of active ensembles in dilute alloy nanoparticles, demonstrating that catalytic performance can be tuned by controlling the size and distribution of active metal atoms within a noble‐metal matrix. In one example, a combination of machine learning–driven spectroscopy and first‐principles modelling elucidated that surface ensembles containing one to three palladium atoms on gold nanoparticles are responsible for hydrogen–deuterium exchange activity, and that pretreatment protocols allow on‐demand modulation of these ensembles to optimise reaction rates. Another investigation employed in situ characterisation to show that embedded palladium atoms in a gold–silica matrix dynamically migrate to the surface under reductive or oxidative atmospheres, thereby enabling reversible activation and suppression of hydrogenation activity while maintaining remarkable resistance to sintering over multiple cycles. These insights into atomic‐level dynamics and ensemble control pave the way for rational design of highly efficient, stable nanoparticle catalysts.

Nanoparticle Catalysis in Heterogeneous Systems publication trend

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

Technical terms

Heterogeneous catalysis: A catalytic process in which the catalyst and reactants exist in different phases, typically solid catalyst with liquid or gas reactants.

Nanoparticle: A particulate material with at least one dimension in the 1–100 nm range, exhibiting size‐dependent physical and chemical properties.

Active site: A specific atomic ensemble on a catalyst surface where substrate molecules adsorb and react.

Single‐atom catalyst: A catalyst architecture in which individual metal atoms are isolated on a support, maximising atom efficiency and enabling site‐specific chemistry.

Sintering: The process by which small particles coalesce into larger ones under thermal or chemical stress, leading to loss of active surface area.

Redispersion: The recovery process in which agglomerated or sintered particles are broken down into smaller, active nanoparticles under chemical treatment.

References

1. Atom hybridization of metallic elements: Emergence of subnano metallurgy for the post-nanotechnology. Coordination Chemistry Reviews (2023).
2. Size controllable redispersion of sintered Au nanoparticles by using iodohydrocarbon and its implications. Chemical Science (2016).
3. Atom-hybridization for synthesis of polymetallic clusters. Nature Communications (2018).
4. In situ formation of mononuclear complexes by reaction-induced atomic dispersion of supported noble metal nanoparticles. Nature Communications (2019).
5. Decoding reactive structures in dilute alloy catalysts. Nature Communications (2022).