| 程序升温条件下铁及其氧化物在CO存在时对N2O的还原机理 |
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| 引用本文： | 周浩生,陆继东,周琥,徐益谦.程序升温条件下铁及其氧化物在CO存在时对N2O的还原机理[J].环境科学学报,2001,21(2):167-171. |
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| 作者姓名： | 周浩生 陆继东 周琥 徐益谦 |
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| 作者单位： | [1]东南大学热能工程研究所，南京210096 [2]华中理工大学煤 |
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| 基金项目： | 博士后科学基金；国家重点基础研究发展规划项目资助(1999022209) |
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| 摘 要： | 应用热综合分析仪（TG－FTIR）研究了在还原性气氛下Fe及其氧化物对N2O的催化还原 作用。研究发现铁氧化物对氮氧化物的催化还原能力相当弱，而Fe可以高效地降低N2O分解的初始温度和提高N2O向N2的转化率。在Fe和CO的作用下，N2O的初始分解温度为920K和1000K。在1123K时，N2O的转化率达到95％和805。TG／DSC曲线表明了在Fe与N2O反应过程中CO的作用表现为通过与N2O在反应表面的竞争吸附使铁氧化物还原为金属铁，X射线衍射证明Fe与N2O反应后的氧化物为Fe2O3；扫描电镜对反应后Fe表面物理形态的研究发展，在CO作用下，Fe的表面呈松散结构，可以保证Fe对氮氧化物反应的连续进行。
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| 关 键 词： | 催化 氧化亚氮 铁 氧化物 程序升温条件 还原 大气污染 |
| 文章编号： | 0253-2468(2001)-02-0167-05 |
| 收稿时间： | 2000/2/25 0:00:00 |
| 修稿时间： | 2000年2月25日 |
Reduction of N2O in the presence of Fe and its oxides with CO at programmed temperature |
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| ZHOU Haosheng,LU Jidong,ZHOU Hu and XU Yiqian.Reduction of N2O in the presence of Fe and its oxides with CO at programmed temperature[J].Acta Scientiae Circumstantiae,2001,21(2):167-171. |
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| Authors: | ZHOU Haosheng LU Jidong ZHOU Hu and XU Yiqian |
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| Institution: | Thermoenergy Engineering Research Institute, Southeast University, Nanjing 210096,National Laboratory of Coal Combustion, Huazhong University of Science and Technology, Hubei, Wuhan 430074,National Laboratory of Coal Combustion, Huazhong University of Science and Technology, Hubei, Wuhan 430074 and Thermoenergy Engineering Research Institute, Southeast University, Nanjing 210096 |
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| Abstract: | Nitrous oxide(N2O) is a greenhouse gas. With the development of fluidized bed combustion, the emission of the N2O is generally observed. Chemical reactions between Fe and its oxides, N2O and CO were investigated with TG-FTIR. The oxides of iron were found to be relatively un-reactive to the destruction of N2O. The decomposition temperatures of N2O were 1000K and 920K in the presence of Fe with/without CO, and the conversions of N2O to N2O at 1123K were 95% and 80%, respectively. TG/DSC curves confirmed that the most of iron oxides produced by Fe N2O reaction could be reduced to metallic iron in the presence of CO. XRD pattern revealed that the N2O reacted with iron to yield Fe2O3 as the major product. ESM showed that very porous structure was formed when N2O reacted with Fe and CO. The results showed that Iron is a strong reducing agent for N2O reduction. |
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| Keywords: | Catalyst nitrous oxide iron oxides |
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