Low-temperature selective catalytic reduction of NO with NH₃ over monolith catalyst of MnO_x/CeO₂¨CZrO₂¨CAl₂O₃

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• 作者：Qiulin  ; Zhang ; Chuntian  ; Qiu ; Haidi  ; Xu ; Tao  ; Lin  ; ;   ; ^{lintaochem@scu.edu.cn} ; Zhien  ; Lin ; Maochu  ; Gong ; Yaoqiang  ; Chen  ; ;   ; ^{nic7501@scu.edu.cn}
• 关键词：SCR ; Low temperature ; NO ; Monolith catalyst ; Manganese
• 刊名：Catalysis Today
• 出版年：2011
• 出版时间：25 October 2011
• 年：2011
• 卷：175
• 期：1
• 页码：171-176
• 全文大小：849 K

文摘

MnO_x/CeO₂¨CZrO₂¨CAl₂O₃ (MnO_x/CZA) catalysts with different amounts of manganese loading were prepared by incipient wetness impregnation method for selective catalytic reduction (SCR) of NO with NH₃ at low temperature. The catalysts were characterized by N₂ adsorption¨Cdesorption measurement, XRD, XPS, and H₂-TPR. Catalytic activity tests reveal that the MnO_x/CZA catalyst with 10 % manganese loading has the best catalytic activity, almost 90 % NO is translated to N₂ in the temperature range of 143?00 ¡ãC. The highly dispersed MnO_x species, the good oxidation activity of NO to NO₂, the existent synergistic effect between the manganese and cerium oxides, and the various oxidation states of manganese oxides may be the main reasons for the best SCR activity. In addition, the SCR activity is slightly influenced in the presence of SO₂ and H₂O, while such effect is restorable after heating treatment.