| 铁氧化物在流化床温度和CO气氛下的形态迁移及其对NO催化还原 |
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| 引用本文： | 吕佳宇,胡丽琳,宋天星,张扬,张海,马素霞,吕俊复.铁氧化物在流化床温度和CO气氛下的形态迁移及其对NO催化还原[J].化工进展,2020,39(11):4474-4479. |
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| 作者姓名： | 吕佳宇 胡丽琳 宋天星 张扬 张海 马素霞 吕俊复 |
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| 作者单位： | 1.太原理工大学电气与动力工程学院，山西 太原 030024;2.清华大学能源与动力工程系，热科学与动力工程 教育部重点实验室，北京 100084 |
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| 基金项目： | 山西省科技重大专项;国家自然科学基金 |
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| 摘 要： | 利用小型固定床实验台实验研究了铁氧化物在典型流化床温度和CO还原性气氛下的形态迁移及其生成物对NO的催化还原作用，采用分级还原结合X射线衍射（XRD）表征分析，确定铁氧化物与CO和NO反应后生成物的价态及各种铁氧化物对NO的还原机制。结果表明，Fe2O3在实验条件下可依次被CO还原为Fe3O4、FeO和单质铁，反应过程中随着还原度的增加，还原速率逐级下降，从Fe2O3还原到Fe3O4的速率最高，FeO还原到Fe速率最低，在实验温度范围内，床温升高有利于提高Fe2O3到Fe3O4的还原速率和还原度。不同形态的铁氧化物对NO的催化还原特性不同，Fe2O3及其部分还原后生成的Fe3O4都不能直接与NO反应，Fe2O3对CO催化还原NO的效果很弱，而Fe3O4对CO还原NO的反应却有很强的催化作用，而进一步还原生成FeO与单质铁还可直接与NO反应。
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| 关 键 词： | 氧化铁 还原 形态迁移 催化剂 流化床 |
Occurrence transformation of iron oxides and their catalytic reduction of NO under fluidized bed temperature and CO |
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| LYU Jiayu,HU Lilin,SONG Tianxing,ZHANG Yang,ZHANG Hai,MA Suxia,LYU Junfu.Occurrence transformation of iron oxides and their catalytic reduction of NO under fluidized bed temperature and CO[J].Chemical Industry and Engineering Progress,2020,39(11):4474-4479. |
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| Authors: | LYU Jiayu HU Lilin SONG Tianxing ZHANG Yang ZHANG Hai MA Suxia LYU Junfu |
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| Affiliation: | 1.College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
2.Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | The occurrence transformation of iron oxides during their catalytic reduction of NO under typical fluidized bed temperatures and CO atmosphere was experimentally investigated in a fixed bed reactor using the staging reduction method. With the assistance of XRD characterization, the occurrences of the products of the reducing reactions and their catalytic NO reduction mechanisms were identified. The results revealed that Fe2O3 was reduced by CO to Fe3O4, FeO and Fe successively under the experimental conditions. With the increase of reduction degree, the reduction rate gradually decreased. The reduction rate of Fe2O3 to Fe3O4 was rapid, but that of FeO to Fe became very low. In the experimental temperature range, the increase of bed temperature was beneficial to the increase of the reduction rate and to the reduction degree of Fe2O3 to Fe3O4. Moreover, different oxides have their distinct NO reduction characteristics. Fe2O3 and the partially reduced Fe3O4 barely reacted with NO directly but Fe3O4 had strong catalytic effect for the NO reduction by CO which however was not the case for Fe2O3. The further reduced FeO and Fe can also react with NO directly. |
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| Keywords: | iron oxides reduction occurrence transformation catalyst fluidized bed |
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