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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
Reduction of N2O in the presence of Fe and its oxides with CO at programmed temperature
【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N2 O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N2 O分解的初始温度和提高N2 O向N2 的转化率 .在Fe和CO的作用下 ,N2 O的初始分解温度为 92 0K和 10 0 0K .在 112 3K时 ,N2 O的转化率达到 95 %和 80 % .TG/DSC曲线表明了在Fe与N2 O反应过程中CO的作用表现为通过与N2 O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N2 O反应后的氧化物为Fe2 O3 ;扫描电镜对反应后Fe表面物理形态的研究发现 ,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
【Abstract】 Nitrous oxide(N 2O) is a greenhouse gas. With the development of fluidized bed combustion, the emission of the N 2O is generally observed. Chemical reactions between Fe and its oxides, N 2O and CO were investigated with TG\|FTIR. The oxides of iron were found to be relatively un\|reactive to the destruction of N 2O. The decomposition temperatures of N 2O were 1000K and 920K in the presence of Fe with/without CO, and the conversions of N 2O to N 2 at 1123K were 95% and 80%, respectively. TG/DSC curves confirmed that the most of iron oxides produced by Fe N 2O reaction could be reduced to metallic iron in the presence of CO. XRD pattern revealed that the N 2O reacted with iron to yield Fe 2O 3 as the major product. ESM showed that very porous structure was formed when N 2O reacted with Fe and CO. The results showed that Iron is a strong reducing agent for N 2O reduction.
- 【文献出处】 环境科学学报 ,Acta Scientiae Circumstantiae , 编辑部邮箱 ,2001年02期
- 【分类号】X131.1
- 【被引频次】14
- 【下载频次】157