Pt catalyst is supported on the carbon nanotubes (CNTs) by the polyol process. To evaluate the activity of Pt/CNTs, we performed catalytic redox reactions with various reaction constituents, such as CO, toluene, CO and NO, and toluene and NO in the presence of 6% O-2. These investigations indicated that the efficient removal of pollutants is attributed to the high dispersion of 2-3 nm Pt particles on the CNTs. Based on the backscattered electron image, platinum dispersion on carbon supports can be observed clearly. In the presence of toluene and NO, the Pt/CNTs catalyst shows a good redox reaction for NO removal, and toluene is a better reductant than CO. (C) 2008 Elsevier B.V. All rights reserved.