上海交通大学学报

上海交通大学学报（自然版）

• 能源与动力工程 • 上一篇    下一篇

二甲醚选择性催化还原NOx的试验研究

闫应，张武高，陈晓玲，刘佳
  

  1. (上海交通大学 动力机械与工程教育部重点实验室， 上海 200240)
  • 收稿日期:2009-11-10 修回日期:1900-01-01 出版日期:2010-10-31 发布日期:2010-10-31

Experimental Study on Dimethylether SCR NOx Reduction

YAN Ying,ZHANG Wugao,CHEN Xiaoling,LIU Jia
  

  1. (Key Laboratory for Power Machinery and Engineering of Ministry of Education, Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2009-11-10 Revised:1900-01-01 Online:2010-10-31 Published:2010-10-31

摘要： 使用7% MoO3/γAl2O3（质量分数）为催化剂，对二甲醚（DME）作为还原剂选择性催化还原（SCR）降低NOx进行了试验研究.分别考察了反应温度、氧含量、DME与NO的比例对NO转化率的影响，测定了产物中的碳分布，并对NO与NO2分别作为NOx源进行了转化率比较.研究结果表明：常压条件下，在250~500 ℃内，随着反应温度的升高，NOx转化率先增大后减小；醚氮比对NO转化率的影响不明显；随着氧含量的增加，NOx转化率先增大后减小，当φO2=5%时，NO最高转化率约为53%；NO2比NO更容易被DME催化还原；含碳主要产物为CO、CO2，有少量甲醇（CH3OH）、甲醛（H2CO）生成.

关键词: 二甲醚, 转化率, 选择性催化还原

Abstract: Selective catalytic reduction (SCR) activity for NOx conversion to N2 over 7% MoO3/γAl2O3 (mass fraction) was investigated with Dimethylether (DME) as a reductant. The effects of the reaction temperature, DME/NO ratio as well as the oxygen inlet concentration were studied respectively. The carboncontaining 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 carboncontaining products are CO and CO2, while a little CH3OH and H2CO have also been detected during the experiment.

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