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低温条件下Nano-MnO_x上NH₃选择性催化还原NO

Nano-MnO_x Catalyst for the Selective Catalytic Reduction of NO by NH₃ in Low-temperature

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【Author】 TANG Xiao-long~1,HAO Ji-ming~2,XU Wen-guo~1,LI Junhua~2(1.Institute for Chemical Physics,Beijing Institute of Technology,Beijing 100081,China;2.Department of Environmental Science & Engineering,Tsinghua University,Beijing 100084,China)

【机构】北京理工大学化学物理研究所；清华大学环境科学与工程系；清华大学环境科学与工程系北京100081；北京100084；北京100081；

【摘要】采用流变相法制备了无载体Nano-MnOx催化剂,在低温条件下(50~150℃)以NH3为还原剂系统考察了氮氧化物的选择催化还原特性.结果表明,流变相法制备的Nano-MnOx催化剂具有良好的低温催化活性.实验条件下,80℃即可获得98.25%的NO转化率,100~150℃内NO几乎完全转化;SO2和H2O会与NO和NH3在催化剂表面产生竞争吸附,导致催化活性下降,但该影响是可逆的.经分析,较大的比表面积和较低的晶化度是Nano-MnOx具有良好低温活性的2个主要原因.更多还原

【Abstract】 Nanometer particles composed of manganese oxides（Nano-MnO_x）,which prepared by rheological phase reaction method,show superior low-temperature SCR activity for NO with NH₃ in the presence of excess O₂.In experiments,the NO conversion is 98.25% at 80℃,and nearly 100% NO could be converted in 100～150℃.Due to the reason of competing adsorption,H₂O has a slight impact on the activity and the deactivation of SO₂ is reversible.The experiments implied that the superior low-temperature catalytic activity of Nano-MnO_x was mainly due to its high BET specific areas and poor crystallinity.更多还原