Copper Catalysts Supported on Cemno2 For Co Oxidation in Hydrogen-Rich Gas Streams

The cemno2 supports were prepared via co-precipitation method by ammonia asprecipitating agent. the cuo/ceo2 and cuo/ce(1-x)mnxo2 (x=0.1, 0.3 and 0.5)catalysts were synthesized by wet impregnation method. the physicochemicalproperties of the prepared cuo/ce(1-x)mnxo2 catalysts were characterized by n2adsorption-desorption, powder x-ray diffraction (xrd) and programmed h2temperature reduction (h2-tpr). the effects of cu and mn loading were investigatedon the catalytic performance. the findings illustrated that the 7% cuo/ce0.9mn0.1o2catalyst shows high activity for co-prox. the high activity of 7% cuo/ce0.9mn0.1o2catalyst was ascribed to high surface area of the support, synergetic effects of cuoand ceo2 and increases of the mobility of lattice oxygen in ceria by addition ofmno2. the effects of presence of h2o in the reaction feed stream, oxygen to co ratio(?) and gas hourly space velocity (ghsv) on the catalytic activity of 7%cuo/ce0.9mn0.1o2 were evaluated. it was found that the best performance of 7%cuo/ce0.9mn0.1o2 catalyst was obtained at ?=2, ghsv=20000 h-1 and in addition,the presence of h2o had negative effects on the activity of the catalyst. in the longterm stability test, nearly 100% co conversion was maintained for 50 h at 120°cwith 70-80% co2 selectivity.