Conversion of propargylic amines with CO2 from flue gas using Lu2CrMnO6 supported by ionic liquid on dendritic nanosilica

The concurrent creation of a phase interface and threadlike architecture can enhance the segregation, enzymatic efficiency, and functionality of dendritic silica fibres (DFNS). Nonetheless, a straightforward and eco-friendly fabrication method remains essential. In this study, we successfully developed a sophisticated dandelion-resembling SiO₂ with an anatase/SiO₂ phase interface and highly distinct surface area using a simple and environmentally benign deep eutectic solvent-modulating technique. The extensive distinct surface area is attributed to its 3D hierarchical structure, composed of 2D ultrathin nanolayers with mesoscopic cavities. We synthesized Lu₂CrMnO₆ nanoparticles with ionic liquid loaded on DFNS (Lu₂CrMnO₆@IL-DFNS) through an uncomplicated synthetic route. DFNS provided numerous -OH groups for uniform IL loading via chemical linkage, while IL adjusted the fibre dimensions and exposed dynamic adsorption sites of –NH₂ groups, facilitating CO₂ chemisorption. The aggregate morphology of the Lu₂CrMnO₆@IL-DFNS composite remained largely unchanged after Lu₂CrMnO₆@IL loading, maintaining its mesoporous structure, crystalline form, and chemisorptive properties. This catalyst exhibited a low incidence of 2-oxazolidinone generation during the direct synthesis from propargylic amines and CO₂ owing to its limited distinct surface area and fewer active sites.