氧化铁催化甲烷脱硝的实验研究  

NO Reduction by Methane with Fe_2O_3 Catalyst

作　　者：徐伟[1] 黄晓煜[1] 马光宇[1] 韩晓东[1] 佟会玲[2] 陈昌和[2] 

机构地区：[1]鞍山钢铁集团公司,辽宁鞍山114009 [2]清华大学热能动力工程与热科学重点实验室,北京100084

出　　处：《环境科学与技术》2012年第4期47-51,73,共6页Environmental Science & Technology

基　　金：清华大学试验室开放基金(LF20071985)

摘　　要：文章使用固定床反应器在350℃～850℃范围内对氧化铁催化甲烷脱硝进行了实验研究。研究结果发现在有2％氧气存在条件下，氧化铁催化甲烷脱硝的效果最高只有20％，而且在350℃～750℃范围的氧化铁催化甲烷脱硝反应机理与850℃时的脱硝反应机理并不相同。在高温的850oC～950℃范围无氧气条件下，NQ转化率随着温度升高而单调增加，随CH4／NO摩尔比的增加而升高，氧化铁催化甲烷脱硝的最佳效果可以达到将近100％。通过进一步分析发现高温850oc～950℃无氧气条件下的脱硝反应机理是在催化剂表面进行了氧化还原反应，即首先发生了CH4与Fe20。的气固反应，将FeI晚还原为Fe3O4，而后Fe3O4再与NO反应将其还原为N2。This paper investigates NO reduction by methane via Fe2O3 catalyst in a fixed bed reactor under 350-950 ℃. The experimental results indicate that Fe2O3 has only 20% of maximum catalytic effect on NO reduction with 2% O2 present, and the reaction mechanism of NO reduction by methane via Fe203 catalyst is different within the temperature range. But the Fe203 has a very good catalytic effect close to 100% on NO reduction in the absence of 02 within the range of 850-950 ~C. The NOx conversion increases monotonically with increasing temperature and molar ratio of CH4/NO. It indicates that the reaction mechanism of NO reduction in the absence of 02 within the range of 850-950 ℃ is the re-dox reactions on the Fe2O3 catalyst surface, That is the gas-solid reactions of CH4 and Fe203 occurred firstly, and the Fe2O3 was reduced to Fe3O4, then the Fe3O4 reduced NO to N2.

关 键 词：脱硝 甲烷 氧化铁 

分 类 号：X132[环境科学与工程—环境科学]