二甲醚选择性催化还原NO_x的试验研究  

Experimental Study on Dimethyl-ether SCR NO_x Reduction

作　　者：闫应[1] 张武高[1] 陈晓玲[1] 刘佳[1] 

机构地区：[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

出　　处：《上海交通大学学报》2010年第10期1347-1351,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50676056)

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.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.

关 键 词：二甲醚 转化率 选择性催化还原 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]