Polyhedral Cobalt Oxide Supported Pt Nanoparticles with Enhanced Performance for Toluene Catalytic Oxidation

Polyhedral CoO was synthesized by calcination of Co-based metal-organic framework ZIF-67 and highly dispersed Pt nanoparticles were successfully loaded on CoO. The catalytic results showed that Pt/CoO had the best activity and stability. As compared with conventional CoO, polyhedral CoO showed more excellent catalytic oxidation performance of toluene, which was related to enhanced oxygen mobility, defective structure and rich active oxygen species provided by Polyhedral CoO. Moreover, Pt-CoO metal-support interaction enhanced the dispersion of Pt species and showed more Pt ratio. It was reasonable that the gaseous O can be activated directly or moved into the catalyst's surface to form oxygen cycle.