Simultaneous removal of SO_2 and NO_x from flue Gas on NiMgAlO catalyst in the presence of O_2

摘要

NiMgAlO catalysts were prepared by two methods: coprecipition and impregnation. They were used to simultaneously adsorb SO_2 and NO with O_2 in a fixed bed at atmospheric pressure. Typically the molar composition of the feed gas was 1% SO_2, 0.2% NO and O_2 with ultra-high purity Ar as the diluent. The results showed the catalysts were excellent materials for the simultaneous oxidation adsorption of SO_2 and NO_x. The two kinds of catalysts were compared for the SO_2 and NO_x adsorption capacity. The NiMgAlO catalyst prepared by coprecipition had better adsorption than impregnation. When NiMgAlO catalysts with 10 wt-% Ni content were calcined at 550°C, adsorption capacity was the largest at 120°C adsorption temperature: 1.392 mmol SO_2 and 0.213 mmol NO_x were adsorbed on 1 g catalyst prepared by the coprecipition method. The causes are seen by the XRD, surface area and porous size analysis.