State-of-the-art nanocatalysts driving sustainable biofuel production

Abstract Nano-catalysts have emerged as significant entities in enhancing the efficacy and Selectivity of biodiesel production from renewable substrates, such as used cooking oils, animal lipids, and plant-derived fats. In contrast to traditional catalytic agents, nanoparticle-based systems, especially those composed of metal oxides and magnetically recoverable materials, exhibit enhanced surface areas (200–500 m 2 /g), accelerated transesterification kinetics, and superior tolerance to free fatty acids, culminating in biodiesel yields that surpass 90 % under less stringent reaction conditions. Recent developments in heterogeneous nanocatalysts have facilitated reusability for as many as 50–100 cycles with negligible deactivation (<2 % per cycle), thus bolstering industrial applicability. Novel advancements in synthesis techniques, encompassing sol–gel and sonochemical methodologies, further diminish energy consumption and augment catalyst stability. Despite the challenges associated with production expenses and scalability, ongoing investigations into multifunctional nanostructures and environmentally benign synthesis routes continue to drive advancements toward economically feasible and ecologically sustainable biodiesel technologies.