Lu2CrMnO6–Pm-g-C3N4 supported dendritic nanosilica as a recyclable green catalyst for eco-friendly synthesis of N-[(2-hydroxyethoxy)carbonyl] glycine from carbon dioxide

The rational design of heterogeneous catalysts with hierarchical nanostructures and large surface areas is crucial for enhancing active site accessibility and improving catalytic efficiency. In this context, we report the synthesis of a novel, recyclable nanocatalyst composed of Lu₂CrMnO₆ nanoparticles anchored onto pyrimidine grafted graphitic carbon nitride nanosheets (Pm-g-C₃N₄), which are uniformly immobilized on dendritic fibrous nanosilica (DFNS). The integration of DFNS provides a highly porous, open channel framework rich in surface hydroxyl groups, facilitating strong chemical bonding with Pm-g-C₃N₄ and ensuring stable immobilization of the Lu based perovskite phase. This hierarchical DFNS/Pm-g-C₃N₄@Lu₂CrMnO₆ nanocomposite was synthesized through a straightforward, environmentally friendly route and exhibits excellent structural integrity, high dispersion of active Lu₂CrMnO₆ sites, and efficient charge transfer characteristics. Under solvent-free conditions, the catalyst effectively promotes the three component coupling of CO₂, α-amino acids, and ethylene oxide, yielding N-[(2-hydroxyethoxy)carbonyl]glycine with remarkable selectivity and yield under mild reaction parameters. The system demonstrates outstanding recyclability over multiple cycles with negligible activity loss, making it an attractive candidate for sustainable CO₂ conversion. The synergistic effects of the Lu₂CrMnO₆ perovskite, nitrogen rich g-C₃N₄ functionality, and the high surface area DFNS support contribute to the superior catalytic behavior. Overall, the DFNS/Pm-g-C₃N₄@Lu₂CrMnO₆ platform offers promising prospects for green CO₂ fixation technologies relevant to materials science.