Experimental Study on Denitration and Mercury Removal Performance by Sulfur-Tolerant ATP Catalyst

Low temperature denitration and mercury removal catalysts generally possess poor sulfur resistance. The Mn-ATP and Mn-Ce-ATP catalysts with different ratios were prepared by impregnation method based on attapulgite. The catalytic performance of the catalyst for Hg0 and NO and the sulfur resistance in sulfur-containing flue gas were studied under simulated coal-fired flue gas conditions in the laboratory. The results showed that both Mn-ATP and Mn-Ce-ATP catalysts have good effects on denitration and mercury removal, but Mn-ATP was obviously deactivated after the addition of SO2. The addition of Ce significantly improved the low-temperature denitration and Hg0 oxidation performance of the catalyst in the presence of SO2. Among them, at 250℃, the 8%Mn-5%Ce-ATP catalyst still maintained 79% mercury removal efficiency and 60% denitrification efficiency after the introduction of 400 ppm SO2. It is of great significance for energy saving and emission reduction and operation cost reduction of coal-fired power plants to develop a new SCR catalyst to ensure its high efficiency of denitration and mercury removal.