Researchers from Tokyo Tech have made a significant breakthrough in the field of catalysis by developing a method to control the crystal phase of cobalt nanoparticles, enhancing their performance in hydrogenation processes. The newly produced Co NPs, created through an innovative hydrosilane-assisted synthesis method, exhibit exceptional catalytic properties, enabling the selective hydrogenation of compounds under mild conditions without the need for harmful gases such as ammonia. This advancement holds great promise for various industrial sectors reliant on hydrogenation, offering a sustainable and efficient alternative to scarce and expensive noble metal catalysts like palladium and rhodium. Traditionally, noble metals have been preferred for catalytic reactions, but their environmental impact and high cost have been significant drawbacks. The emergence of cobalt as a viable alternative has opened up new possibilities due to its efficiency and lower operational requirements. The research team successfully produced two distinct crystal phases of Co NPs, with hexagonal close-packed (hcp) Co NPs showing superior catalytic performance compared to face-centered cubic (fcc) Co NPs in hydrogenation reactions. The study highlights the potential of Co NPs as a cost-effective and environmentally friendly catalyst for a wide range of compounds. The reusability of the Co NPs and their ability to function without harmful gases make them an attractive option for industries looking to enhance their catalytic processes sustainably. This development not only paves the way for more energy-efficient catalysis but also promises a reduction in the environmental impact of industrial processes, ultimately contributing to a more sustainable future.