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1.
Laboratory scale experiments were carried out in order to get more information about the oxidation of SO2 by OH radicals (homogeneous reaction) and the oxidation of SO2 at aerosol surfaces (heterogeneous reaction). For the experiment of homogeneous reaction, SO2 was added to synthetic flue gas without initial NO and without ammonia and the mixture was irradiated with electron beam. The SO2 removal was measured as a function of temperature and water vapour concentration at constant dose. For the experiment of heterogeneous reaction, SO2 was added to nucleating sulfuric acid aerosol. No SO2 removal was observed in this case. So, it can be concluded that the heterogeneous oxidation of SO2 is negligible in the absence of ammonia. Therefore, the oxidation of SO2 must be interpreted merely by homogeneous gas phase chemistry. The gas phase kinetics are derived from comparison of experimental results and computer modelling. 相似文献
2.
《中国化学快报》2021,32(10):2963-2974
The simultaneous removal of SO2, NOx and Hg0 from industrial exhaust flue gas has drawn worldwide attention in recent years. A particularly attractive technique is selective catalytic reduction, which effectively removes SO2, NOx and Hg0 at low temperatures. This paper first reviews the simultaneous removal of SO2, NOx and Hg0 by unsupported and supported catalysts. It then describes and compares the research progress of various carriers, eg., carbon-based materials, metal oxides, silica, molecular sieves, metal-organic frameworks, and pillared interlayered clays, in the simultaneous removal of SO2, NOx and Hg0. The effects of flue-gas components (such as O2, NH3, HCl, H2O, SO2, NO, and Hg0) on the removal of SO2, NOx, and Hg0 are discussed comprehensively and systematically. After summarizing the pollutant-removal mechanism, the review discusses future developments in the simultaneous removal of SO2, NOx and Hg0 by catalysts. 相似文献