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H2O和SO2在NH3选择性催化还原NOx过程中的影响 被引量:12

Effects of H_2O and SO_2 on NO_x Selective Catalytic Reduction by NH_3
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摘要 在连续流动固定床反应器上利用氨气作还原剂对一纳米级V-W/Ti基催化剂的选择性催化还原氮氧化物的反应进行了实验研究,分析了水蒸气和硫氧化物对脱除氮氧化物的影响。试验结果表明,气体组分中含水蒸气对SCR低温活性具有一定抑制作用;水蒸气的存在在较高温度时对氨直接氧化为氮氧化物也具有抑制作用,这间接提高了高温段的氮氧化物脱除效率。150℃~500℃时气体组分中含有硫氧化物可以提高SCR活性,氮氧化物脱除率在无、有硫氧化物的条件下由最高94%提升至98%。气体成分中同时含水蒸气和硫氧化物的情况下,在150℃~240℃SCR活性有较明显的提高,在350℃~500℃温度范围内对氮氧化物脱除率也存在一定的促进作用,但在低温时有硫酸铵盐结晶物质生成。 An experiment was conducted on a steady-flow reactor to study the effects of H2O and SO2 content on NOx reduction efficiency of a nanometre-class V-W/Ti catalyst. Experimental results show that H2O will inhibit the activity of SCR at lower temperature; and H2O will inhibit the oxidation reaction from NH3 to NOx at higher temperature, which can result in higher NOx conversion efficiency. At 150℃-500℃, SO2 can promote the activity of SCR. The NOx conversion efficiency when containing SO2 and not containing SO2 can reach 98 % and 94 % respectively. When containing both H2O and SO2, the activity of SCR will be obviously increased at 150℃-240℃ and the NOx conversion efficiency will be promote at 350 ℃-500 ℃, but the sulfates will appear at lower temperature.
出处 《内燃机工程》 EI CAS CSCD 北大核心 2008年第3期56-58,63,共4页 Chinese Internal Combustion Engine Engineering
关键词 内燃机 V2O5-WO3/TIO2催化剂 选择性催化还原反应 IC engine V2O5-WO3/TiO2 catalyst selective catalytic reduction
作者简介 陶建忠(1976-),男,博士生.主要研究方向为重型车用柴油机SCR技术.E—mail:taojz123@yahoo.com.cn。
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