Facile synthesis of Ag–OMS-2 nanorods and their catalytic applications in CO oxidation

Ag–OMS-2 nanorods were synthesized by a simple solid-state reaction of AgMnO4 with manganese acetate. The nanorods had a diameter of about 8 nm and lengths of 50–150 nm with the co-existence of micropores and mesopores. Structural analysis revealed that the nanorods were amorphous but exhibited lattice fringes of Ag–hollandite structure. The silver species presented as Ag+ and the average oxidation state of manganese was 3.7. Most importantly, the Ag–OMS-2 nanorods showed quite high catalytic performance for CO oxidation with 100% CO conversion at 90 °C, mainly because of the significantly enhanced oxygen activation and CO adsorption with the presence of Ag+ in the tunnels.