Different metals were impregnated onto BEA zeolites supports by ion-exchanging method to prepare catalysts for NO reduction. Activities of the prepared catalysts were then examed in a fixed bed reactor for NO reduction by CO, H-2, and CH4. Experimental results indicated that Cu-BEA shows high catalytic activity for NO reduction by CO and H-2 at 300 degrees C -500 degrees C, while Co-BEA shows high catalytic activity of NO reduction by CH4 at 400 degrees C -500 degrees C. Activities of all the catalysts increase as the temperature rises. Then characterization of H-2-TPR, XED, XPS and BET were conducted used to investigate the physical and chemical properties of these BEA catalysts. In-situ Fourier transform-infrared spectroscopy was also used to study the mechanism of the reaction of NO reduction by CO, CH4 and H-2. The reason of different activities over different BEA catalysts was then carefully explored. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.