The kinetics of CO oxidation in hydrogen-rich gas on Pt/mordenite (Pt/MD) or Pt/Al2O3 were investigated over a wide range of CO (0.4-1.8%) and O-2 concentrations (0.26-1.14%). The integral flow measurements showed that both the catalysts that could remove CO from 1% to ppm-level Pt/MD had a wider operation temperature range than Pt/Al2O3, especially towards lower temperatures. (C) 2006 Elsevier B.V. All rights reserved.