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Experimental Study on Dimethylether SCR NOx Reduction
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YAN Ying,ZHANG Wugao,CHEN Xiaoling,LIU Jia
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(Key Laboratory for Power Machinery and Engineering of Ministry of Education, Shanghai Jiaotong University, Shanghai 200240, China)
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Abstract Selective catalytic reduction (SCR) activity for NOx conversion to N2 over 7% MoO3/γAl2O3 (mass fraction) was investigated with Dimethylether (DME) as a reductant. The effects of the reaction temperature, DME/NO ratio as well as the oxygen inlet concentration were studied respectively. The carboncontaining product distributions were presented. NOx conversion with NO and NO2 respectively as NOx source was also investigated. The results show that between the range of 250℃ to 500℃, under atmospheric pressure, when operation temperature increases, NOx conversion increases at the beginning and then decreases. DME/NO ratio has a little impact on NO conversion. When the oxygen inlet concentration increases, NOx conversion increases at the beginning and then decreases, and the highest conversion rate of NO is about 53% when the oxygen inlet concentration is 5%. NO2 is easier for selective reduction than NO with DME as the reductant. The main carboncontaining products are CO and CO2, while a little CH3OH and H2CO have also been detected during the experiment.
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Received: 10 November 2009
Published: 31 October 2010
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