Room Temperature CO Oxidation over Pt/MgFe₂O₄: A Stable Inverse Spinel Oxide Support for Preparing Highly Efficient Pt Catalyst

Abstract

MgFe₂O₄ with inverse spinel structure is demonstrated to be an efficient support for constructing practical potential Pt catalyst (Pt/MgFe₂O₄). The resultant Pt/MgFe₂O₄ exhibits excellent catalytic behavior in CO oxidation under normal temperature and humidity. TOF calculated based on the content of Pt is 0.131 s^-1. The excellent performance of Pt/MgFe₂O₄ attributes to the presence of surface undercoordinated lattice oxygens on MgFe₂O₄ support. These oxygens could participate in the initial CO oxidation and then be recovered under O₂ conditions. Over this Pt/MgFe₂O₄ catalyst, CO catalytic oxidation should mainly follow a redox mechanism.