- The Effects of Sulfate Formation and Mg Addition on the Selective Catalytic Reduction of NOx with CH4 on Ag/Al2O3 Catalysts
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Hee-Lack Choi, Chang-Yong Yu, Heon-Phil Ha
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J Korean Powder Metall Inst. 2011;18(2):159-167.
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DOI: https://doi.org/10.4150/KPMI.2011.18.2.159
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 Abstract
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- The influence of sulfate on the selective catalytic reduction of NO_x on the Ag/Al_2O_3 catalyst was studied when CH_4 was used as a reducing agent. Various preparation methods influenced differently on the deNO_x activity. Among the methods, cogelation precipitation gave best activity. When sulfates were formed on the surfaces of samples prepared by impregnated and deposition precipitation, deNO_x activity was enhanced as long as suitable forming condition is satisfied. The major sulfate formed in Ag/Al_2O_3 catalyst was the aluminum sulfate and it seems that this sulfate acted as a promoter. When Mg was added to the Ag/Al_2O_3 catalyst it promoted deNO_x activity at high temperature. Intentionally added sulfate also enhanced deNO_x activity, when their amount was confined less than 3 wt%.
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