- K and Cs Doped Ag/Al2O3 Catalyst for Selective Catalytic Reduction of NOx by Methane
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Komateedi N. Rao, Chang-Yong Yu, Choi-Hee Lack, Heon-Phil Ha
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J Korean Powder Metall Inst. 2011;18(6):510-516.
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DOI: https://doi.org/10.4150/KPMI.2011.18.6.510
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- In the present study, potassium and caesium doped Ag/Al_2O_3 catalysts were synthesized by simple wet impregnation method and evaluated for selective catalytic reduction (SCR) of NOx using methane. TEM analysis and diffraction patterns demonstrated the finely dispersed Ag particles. BET surface measurements reveal that the prepared materials have moderate to high surface area and the metal amount found from ICP analysis was well matching with the theoretical loadings. The synthesized K-Ag/Al_2O_3 and Cs-Ag/Al_2O_3 catalysts exhibited a promotional effect on deNOx activity in the presence of SO_2 and H_2O. The long-term isothermal studies at 550°C under oxygen rich condition showed the superior catalytic properties of the both alkali promoted samples. The crucial catalytic properties of materials are attributed to NO adsorption properties detected by the NO TPD.
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Citations to this article as recorded by  - Characteristics of Pt/C Nano-catalyst Synthesized by Arc Plasma Deposition
Hye-Sook Joo, Han-Shin Choi, Heon-Phil Ha, Do-Hyang Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 6. CrossRef
- 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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- 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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