Strong Metal-Support Interactions in Heterogeneous Catalysis

Strong metal-support interactions (SMSI) describe phenomena whereby the electronic and structural properties of metal nanoparticles are profoundly altered by their oxidic supports. Such interactions can stabilise active sites, tune adsorption energies and steer reaction pathways in heterogeneous catalysis. Traditionally observed in reducible oxides such as TiO₂ and CeO₂, SMSI manifests through the formation of thin overlayers of partially reduced support material on metal surfaces under reducing conditions. These overlayers can modulate charge transfer, create new interfacial sites and protect particles against sintering. Advances in in situ characterisation and theoretical modelling have revealed dynamic restructuring of these interfaces under reaction conditions, showing that SMSI is not a static state but a continuum of interfacial phenomena. Recent work has extended the concept to bimetallic systems, demonstrating that synergies between multiple metals and their supports can further enhance catalytic activity and selectivity. Control over SMSI is now viewed as a central strategy for designing next-generation catalysts for energy conversion, environmental remediation and fine chemical synthesis.

Research from Nature Portfolio

Recent studies have demonstrated that tuning bimetal-support interactions in RhNi/TiO₂ catalysts yields remarkable performance in ethanol steam reforming. By deriving catalysts from layered double hydroxide precursors, researchers achieved a multifunctional interface comprising Rh–Niδ⁻ species, oxygen vacancies and Ti³⁺ centres. This construct accelerates formate formation, the rate-determining step, and delivers exceptionally high hydrogen yield and operational stability over hundreds of hours. Another investigation has highlighted that the crystal phase of TiO₂ support—rutile versus anatase—critically controls interfacial coupling with Ru nanoparticles during CO₂ hydrogenation. Lattice matching in rutile enhances methane selectivity, whereas anatase induces a classic SMSI overlayer that shifts product distribution towards CO. A third advance engineered disordered TiO₂₋ₓ overlayers on Ni nanoparticles to promote C–C chain growth in CO hydrogenation. The resulting Niδ⁻/TiO₂₋ₓ interfacial sites suppress methane formation and boost C₂⁺ hydrocarbon selectivity under mild conditions, showcasing how SMSI can be harnessed to steer complex product profiles.

Strong Metal-Support Interactions in Heterogeneous Catalysis publication trend

The graph below shows the total number of articles in strong metal-support interactions in heterogeneous catalysis across all publications each year (not limited to Nature Index journals).

Technical terms

Heterogeneous catalysis: Catalytic reactions where the catalyst and reactants exist in different phases, typically solid catalyst with gas or liquid reactants.

Strong Metal-Support Interaction (SMSI): A phenomenon in which the support modifies the electronic structure and surface chemistry of metal nanoparticles, often through overlayer formation.

Reducible oxide: An oxide support capable of partial reduction under reaction conditions, leading to the formation of oxygen vacancies and altered oxidation states.

Overlayer: A thin film of support-derived material that partially encapsulates metal nanoparticles, influencing accessibility and electronic properties.

Oxygen vacancy: A point defect in an oxide crystal where an oxygen atom is missing, creating sites that can trap electrons and alter catalytic behaviour.

References

1. Metal–support interactions in metal oxide-supported atomic, cluster, and nanoparticle catalysis. Chemical Society Reviews (2024).
2. A strong bimetal-support interaction in ethanol steam reforming. Nature Communications (2023).
3. Interfacial compatibility critically controls Ru/TiO2 metal-support interaction modes in CO2 hydrogenation. Nature Communications (2022).
4. Boosting CO hydrogenation towards C2+ hydrocarbons over interfacial TiO2−x/Ni catalysts. Nature Communications (2022).
5. Dynamic interplay between metal nanoparticles and oxide support under redox conditions. Science (2022).