MOFs derived mesoporous Co3O4 polyhedrons and plates for CO oxidation reaction

Abstract

Tremendous works to design the Co3O4 with higher catalytic properties towards CO elimination have been carried out about preparing Co3O4 with special morphology to expose more Co3+ on the surface, such as cubes, wires, and rods. However, the fabrication of Co3O4 with controlled morphologies is usually achieved through complex operations and harsh conditions. In this work, we demonstrated a simple way to synthesize mesoporous Co3O4 polyhedrons and plates, via direct annealing metal-organic frameworks (MOFs) with tunable morphologies. The obtained Co3O4 particles not only repeat the size and form of used MFFs but also were constructed by numerous interconnected nanoparticles. Compared with the prepared Co3O4 polyhedrons, the prepared mesoporous Co3O4 plates exhibit a better catalytic performance on CO oxidation, which can achieve total CO conversion at 85 °C. Such performances are superior to many reported catalyzes without noble metals. The higher activity of Co3O4 plates is mainly due to its larger specific surface areas and the higher surface Co3+ concentrations.