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甲烷在氧化铁表面还原NO的特性与反应机理研究

苏亚欣 ,  邓文义 ,  苏阿龙

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引用本文: 苏亚欣, 邓文义, 苏阿龙. 甲烷在氧化铁表面还原NO的特性与反应机理研究[J]. 燃料化学学报, 2013, 41(9): 1129-1135. shu
Citation:  SU Ya-xin, DENG Wen-yi, SU A-long. NO reduction by methane over iron oxides and the mechanism[J]. Journal of Fuel Chemistry and Technology, 2013, 41(9): 1129-1135. shu

甲烷在氧化铁表面还原NO的特性与反应机理研究

    通讯作者: 苏亚欣(1972-), 男, 博士, 副教授。 E-mail: suyx@dhu.edu.cn, Tel: 021-67792552。
  • 基金项目:

    国家自然科学基金(51278095) (51278095)

    上海市自然科学基金(11ZR1401000)。 (11ZR1401000)

摘要: 在程序控温电加热水平陶瓷管反应器中,在300~1 050 ℃,对N2气氛中甲烷在氧化铁(充分氧化后的铁丝网卷)表面还原NO的特性进行了实验研究,测试了NO脱除效率、CO生成量以及反应后铁样品表面组分和微观状态的变化特点,分析了甲烷在氧化铁表面还原NO的反应机理。在此基础上,在1 000 ℃时,对模拟烟气条件下甲烷在氧化铁表面还原NO的持久性进行了实验研究。结果表明,甲烷在氧化铁表面能够高效地还原NO。在N2气氛下,在850 ℃以上达到100%的NO脱除效率。在模拟烟气中,甲烷在氧化铁表面脱除NO的能力具有很好的持久性。实验结果表明,在1 000 ℃时,采用由体积分数为2.0%的O2、16.8%的 CO2和524×10-6的 NO,N2配平的模拟烟气,1.17% CH4能够在连续100 h内保持100%的NO脱除效率,而未出现下降的趋势。对反应机理的研究结果表明,甲烷在氧化铁表面还原NO的机理包括甲烷通过再燃机理还原NO以及甲烷通过在氧化铁表面还原氧化铁为金属铁、金属铁进而直接还原NO两种主要反应机理。其中,后者为主要反应机理。

English

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  • 收稿日期:  2012-12-31
  • 网络出版日期:  2013-02-28
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