Low temperature selective catalytic reduction of NO with NH₃ over Mn supported on Ce₀.₆₅Zr₀.₃₅O₂ prepared by supercritical method: Effect of Mn precursors on NO reduction
2012
Ko, Jeong Huy | Park, Sung Hoon | Jeon, Jong-Ki | Kim, Seung-Soo | Kim, Sang Chai | Kim, Ji Man | Chang, Daejun | Park, Young-Kwon
Catalysts for low-temperature selective catalytic reduction were developed using Ce₀.₆₅Zr₀.₃₅O₂ (CZO) generated via hydrothermal synthesis in supercritical water as the support. To evaluate the manganese precursors, which are known to have good de-NOx performance at low temperature, manganese acetate (MA) and manganese nitrate (MN) were impregnated on the CZO support. The developed catalysts were characterized using N₂ adsorption–desorption, TGA, XRD, XPS and TPR. De-NOx experiments were carried out using a NOx analyzer to evaluate the performance of the developed catalysts. The MA-impregnated catalyst exhibited higher de-NOx efficiency than that impregnated with MN. This result was attributed to the difference in crystal phase and concentration of surface Mn and the resulting difference in the reducing ability.
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