Catalytic Properties of Alumina-Based Materials

Alumina-based materials, particularly γ-alumina (γ-Al2O3), occupy a central role in heterogeneous catalysis both as active catalysts and as high-surface-area supports for metal and metal-oxide species. Their catalytic performance is intimately linked to surface topology, coordination environments and hydroxyl group distribution, which together govern acidity, basicity and anchoring sites for active phases. Thermal pretreatment, crystal-face engineering and dopant incorporation modulate the abundance and distribution of Lewis and Brønsted acid sites, enabling fine-tuning of catalytic pathways in hydrocarbon conversion, oxidation and hydrogenation reactions. The interplay between surface oxygen vacancies and coordinatively unsaturated aluminium centres further influences redox properties and facilitates processes such as the water-gas shift and dehydrogenation.

Recent advances in atomistic characterisation have illuminated the nature of surface species, from penta-coordinated Al sites to terminal hydroxyl groups, clarifying their roles in anchoring single atoms and nanoclusters. Computational modelling complements these insights by predicting the effects of metal substitution and vacancy formation on electronic structure and reaction energetics. Collectively, this work underscores alumina’s versatility in environmental catalysis, petrochemical processing and fine-chemical synthesis, with an emphasis on scalable, sustainable applications.

Research from Nature Portfolio

Recent studies have exploited precise control of γ-Al2O3 surface facets to promote single-atom dispersion of silver catalysts. By thermally inducing a crystal-plane transformation that increases terminal hydroxyl groups on the (100) face, researchers achieved stable mononuclear Ag sites with enhanced activity in oxidation reactions. Another investigation has revealed the mechanistic details of oxidative dispersion of silver nanoclusters on oxide supports under operando conditions. In situ electron microscopy and near-ambient pressure spectroscopies demonstrated that chemisorption-driven gas–metal interactions underpin the dynamic conversion between nanoscale clusters and atomically dispersed species, offering transferable strategies for catalyst regeneration and design.

Catalytic Properties of Alumina-Based Materials publication trend

The graph below shows the total number of articles in catalytic properties of alumina-based materials across all publications each year (not limited to Nature Index journals).

Technical terms

γ-Al2O3 (gamma-alumina): A transitional phase of aluminium oxide characterised by high surface area and a mixture of tetrahedral and octahedral aluminium sites, widely used in catalysis.

Terminal hydroxyl group: An –OH group bonded to a single surface aluminium atom, acting as an anchoring site for metal species and influencing surface acidity.

Single-atom catalyst: A catalytic system in which individual metal atoms are dispersed on a support, maximising atom efficiency and offering unique selectivity.

Lewis acidity: The ability of a surface site to accept an electron pair, often associated with coordinatively unsaturated metal centres and crucial for catalytic activation of substrates.

Oxygen vacancy: A defect site where an oxygen atom is missing, altering local electronic structure and facilitating redox and adsorption processes.

References

1. Capture of single Ag atoms through high-temperature-induced crystal plane reconstruction. Nature Communications (2024).
2. In situ identification of the metallic state of Ag nanoclusters in oxidative dispersion. Nature Communications (2021).
3. Nature of Five-Coordinated Al in γ‑Al2O3 Revealed by Ultra-High-Field Solid-State NMR. ACS Central Science (2022).
4. Co and Ni Incorporated γ-Al2O3 (110) Surface: A Density Functional Theory Study. Catalysts (2022).