Gallium Oxide Nanorods: Novel, Template-Free Synthesis and High Catalytic Activity in Epoxidation Reactions


  • This work was supported by START1, Methusalem, Prodex, IAP-PAI, and the ERC (grant number 24691—COUNTATOMS and grant number 335078—COLOURATOM) projects. The authors acknowledge Dr. K. Houthoofd, G. Vanbutsele, Dr. C. Klaysom, Prof. J. W. Seo, Dr. T. Korányi, and Prof. K. Binnemans for their support in the characterizations, and Dr. C. Özdilek for useful scientific discussions.


Gallium oxide nanorods with unprecedented small dimensions (20–80 nm length and 3–5 nm width) were prepared using a novel, template-free synthesis method. This nanomaterial is an excellent heterogeneous catalyst for the sustainable epoxidation of alkenes with H2O2, rivaling the industrial benchmark microporous titanosilicate TS-1 with linear alkenes and being much superior with bulkier substrates. A thorough characterization study elucidated the correlation between the physicochemical properties of the gallium oxide nanorods and their catalytic performance, and underlined the importance of the nanorod morphology for generating a material with high specific surface area and a high number of accessible acid sites.