Study on catalysts for catalytic oxidation of gaseous elemental mercury
用于气态零价汞转化的催化剂研究

How to make elemental mercury removed efficiently is the key point for the control of mercury emission from the coal-fired flue gas. To obtain a high conversion from elemental mercury to its oxidation state, which can be easily captured by flue gas desulfurization systems, some catalysts were employed to assist with the oxidation of elemental mercury in the presence of hydrogen chloride,and four metals (strontium, cerium, tungsten, molybdenum) were used tentatively to modify the Mn-catalyst to improve their tolerance capacity to sulfur dioxide(SO2). The results showed that the manganese oxide displayed the highest catalytic oxidative efficiency at 573 K, and the removal efficiency of mercury by manganese can reach 93% and 78% without SO2 and with 1 400 mg/m3 SO2, respectively. Once modified with molybdenum, the removal efficiency of manganese oxides was above 90% with 1 400 mg/m3 SO2, which was significantly higher than the catalysts modified with the other elements.