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| Experimental Study of Dimethyl-Ether Selective Catalytic Reduction NOx over Ag/Al2O3 Catalyst |
| LIU Jia, CHEN Xiao-Ling, WU Jiao, ZHOU Xiang-Man, ZHANG Wu-Gao |
| (Key Laboratory for Power Machinery and Engineering of Ministry of Education,Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract In order to expand the low temperature range of selective catalytic reduction (SCR) NOx by dimethyl-ether (DME), NOx conversion to N2 over Ag/γ-Al2O3catalyst was experimentally studied. The catalyst was prepared by using impregnation method, and the influence of the reaction temperature, the content of Ag, the oxygen concentration, NOx source and the molar ratio of DME/NO were investigated respectively. The results show that Ag/γ-Al2O3displays favorable activity even at 200 °C and the NOx conversion ratio increases at the beginning and then decreases as the temperature increasing. The NOx conversion ratio climbs up and then declines as the oxygen concentration increasing, and the best catalyst activity appears when oxygen content is about 8%. The Ag loading of about 3% can get best catalyst activity, and the DME/NO molar ratio for the highest NOx conversion is 2. The influence of NOx source on NOx conversion is very small.
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Received: 30 September 2010
Published: 29 June 2011
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