Various experiments and analysis were conducted in order to manufacture a catalyst that could very efficiently oxidize carbon monoxide at room temperature and also to identify the relevant factors influencing the oxidation reaction. Pt/TiO2 catalyst can increase the oxidizing capability of CO at low temperature and room temperature by reduction. In FT-IR experiments, the catalyst that displayed excellent activity was capable of efficiently oxidizing CO to CO2 using atmospheric oxygen. Based on the results of XPS analysis, we found that the reduced catalyst changed the platinum's oxidation value to Pt+2 and Pt+0, Through the O-2-reoxidation experiments, the catalyst, which consisted of non-stoichiometric platinum oxidized species, displayed an excellent ability to accept oxygen. In this study, the Pt/TiO2 catalyst was able to very efficiently oxidize CO at low temperature and room temperature even with a minute quantity of platinum. (C) 2010 Elsevier B.V. All rights reserved.