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Research advances in selective catalytic reduction of NO_x over transition metal-based zeolite catalysts

JIANG Jianqing1,PAN Hua2,SUN Guojin1,SHAO Zhenhua1,SHI Yao1(1 Industrial Ecology and Environment Research Institute,Zhejiang University,Hangzhou 310028,Zhejiang,China;2 Department of Environmental Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)  
A general review is given over the research advances in SCR of NOx with ammonia or hydrocarbons over transition metal-based zeolite catalysts in last 10 years.In NH3-SCR system,Cu and Fe based zeolite catalysts are particularly addressed,the deactivation reasons of these catalysts is discussed as well.In HC-SCR system,the effects of different metals,zeolite types,reducing agents,water vapor,sulfur dioxide on the activity of catalysts are summarized,and the well accepted reaction mechanism of HC-SCR is introduced.The future research directions for SCR over zeolite-based catalyst are also included.
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