Structural and surface effect of MnO2 for low temperature selective catalytic reduction of NO with NH3

摘要：

　　α-and β-MnO2 with different phase structures were prepared by hydrothermal method and investigated for low temperature SCR.The α-MnO2 catalyst showed higher activity than the β-MnO2 catalyst at low temperature region.Characterization results revealed that the activity predominately depended on the tunnel (or layer) structure and surface chemisorbed oxygen rather than BET surface area,crystallinity,surface Mn4+/Mn3+ ratio and redox property.α-MnO2 showed the highest activity on account of 2×2 tunnel and the most surface oxygen to promote the NH3 adsorption and activation.β-MnO2 exhibited less activity because of 1 × 1 tunnel structure and little surface absorbed oxygen.Further,DFT calculations were used to model the clean and defect surface as well as the NH3 adsorptions on the tunnels of α-and β-MnO2 model surfaces.

关键词： MnO2 phase structure tunnel DFT SCR low temperature

作者: Yue Peng Huazhen Chang Yun Dai Junhua Li

作者单位: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China

会议类型: 国际会议

会议名称: 2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)

会议地点: 大连

会议语种:英文

页码: 307-311

在线出版日期: 2013-06-04（万方平台首次上网日期，不代表论文的发表时间）