摘要
随着科学技术的不断发展和人民生活质量的逐渐提高，我国也面临严重的环境问题，尤其是NO x的危害。NO x气体对人的呼吸道造成伤害，破坏臭氧层，诱发白内障和皮肤病，造成酸雨等一系列问题。选择性催化还原技术（SCR）去除NO x气体具有高效性和低温性能，成为了去除NO x气体的核心技术。在众多的过渡金属氧化物中，锰基催化剂有高的催化活性和氧化性，较低成本和无毒性，较好抗烧结性能等性能，因此被大量研究。
av是什么本文研究MnO2材料的结构与性能关系，通过水热法合成了三种不同形貌的催化剂，包括MnO2纳米棒、MnO2纳米片和MnO2纳米球。通过SEM、XRD、TEM测试，表明三种MnO2样品都具有较好的晶体结构。通过NH3-SCR测试，表明三种不同结构的MnO2样品的SCR活性变化趋势：纳米球>纳米片>纳米棒，纳米球在200到350°C区间达到100%的NO x转化效率。此外，为了研究MnO2纳米球较高活性可能存在的反应机理，我们详细的做了H2-TPR、NH3-TPD、BET、XPS和in-situ DRIFT等表征。研究发现样品材料表面的化学氧，比表面积，还原性和酸性位点对NO x的去除效率有重要的影响。同时，我们还测试了在SCR 反应中时间、H2O和SO2气体对测试样品活性的影响。
其次，通过水热合成法成功制备出不同Fe/Mn比例的MnFeO x纳米棒。通过NH3-SCR测试，表明Fe元素的掺杂可以使MnFeO x纳米棒的活性提高，使MnFe(0.1)O x纳米棒取得了较高的SCR活性，在200°C时dufu
NO x转化率可达到100%。通过SEM、TEM、XRD、H2-TPR、NH3-TPD、BET、XPS和in-situ DRIFT等表征，表明Fe元素掺杂使催化剂表面结构发生变化，MnFe(0.1)O x纳米棒吸附氨物质的能力增强，酸性位点的数量增加，同时样品的分散度扩大，继而比表面积增大。通过全面测试及其详细的分析，提出了反应机理。
关键词：MnFe(0.1)O x纳米棒，MnO2，NO x，SCR
ABSTRACT
With the continuous development of science and technology and improvement of people's living standards, our country environmental pollution problems become increasingly rious, especially the harm of NO x gas. NO x gas damage the human respiratory tract damage, destruction of the ozone layer, induced cataracts and skin dias, resulting in acid rain and a ries of problems. Selective Catalytic Reduction (SCR) has the high efficiency and low temperature performance of NO x removal and has become the core technology for NO x removal.Among the many transition metal oxides, the mangane-bad catalyst has a high catalytic activity and oxidation resistance, relatively low toxicity and cost, and good sintering resistance, and therefore is widely concerned.
In this paper, the relationship between structure and properties of MnO2 catalysis was studied. Thre
e catalysts with different morphology of MnO2nanorods, MnO2 nanosheets and MnO2nanospheres were synthesized by hydrothermal method. The results show that the three kinds of MnO2 catalysts have good morphology and crystal structure by SEM, TEM and XRD. The NH3-SCR test showed that the SCR activity of the three different structures was: nanospheres>nanosheets>nanorods, and the nanospheres obtained 100% NO x conversion efficiency in the range of 200 to 350 °C. In addition, in order to study the probable mechanism for best removal efficiency of nanosphere, XRD, H2-TPR, NH3-TPD, BET, XPS and in-situ DRIFT have been done in detail. It is found that surface chemisorbed oxygen, specific surface area, reducibility and acid sites have great influences on the NO remove efficiency in SCR reaction. By the way, how veral process parameters affect NO x removal efficiency were still been carried out, such as time, H2O and SO2.
Secondly, MnFeO x nanorods with different Fe/Mn molar ratios were successfully synthesized by hydrothermal method. The NH3-SCR test showed that the Fe element added could improve the activity of the MnFeO x nanorod catalyst, and MnFe(0.1)O x nanorods can obtain high SCR activity and the NO x conversion rate can reach 100% at 200 °C. The surface structure of the catalyst was changed by Fe, TEM, XRD, H2-TPR, TPD, BET, XPS and in-situ DRIFT. The MnFe(0.1)O x nanorods adsorbed ammonia Enhanced, the number of acid sites incread, the dispersion of the ca
talyst expanded, and then the specific surface area incread. Through the above characterization and its detailed analysis, the possible reaction mechanism is put
forward.
KEY WORDS: MnFe(0.1)O x Nanorods, MnO2, NO x, SCR
目录
第1章绪论 (1)
1.1 研究背景 (1)
1.1.1 我国的环境现状 (1)
1.1.2 NO x的来源及危害 (1)
1.1.3关于NO x的控制政策 (2)
1.2 NO x的产生机理及控制技术 (3)
1.2.1 NO x的产生机理 (3)
colour怎么读1.2.2 NO x的控制技术 (4)
1.3 SCR脱硝技术的发展与应用现状 (7)
1.3.1 NH3-SCR反应的基本原理 (7)
1.3.2 NH3-SCR反应的过程与机理 (8)
1.3.3 现有NH3-SCR催化剂存在的问题 (8)
1.4 锰基脱硝催化剂 (9)
英文证明信1.5 本文的选题依据及研究内容 (10)
1.5.1选题依据 (10)
diskman1.5.2研究内容 (11)
第2章实验部分 (13)
2.1 实验药品与设备 (13)
2.1.1实验设备 (13)
2.1.2 实验药品 (13)
2.2 催化剂活性测试 (14)
2.2.1催化剂活性测试装置 (14)
2.2.2 催化剂活性测试方法 (16)
2.3 催化剂表征方法 (16)
2.3.1 扫描电子显微镜（SEM） (17)
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2.3.2 透射电子显微镜（TEM） (17)
2.3.3 X射线衍射光谱（XRD） (17)
yny2.3.4 H2程序升温还原分析（H2-TPR） (17)
2.3.5 NH3程序升温脱附分析（NH3-TPD） (17)
2.3.6 X射线光电子能谱（XPS） (18)
2.3.7比表面积和孔径分布（BET） (18)
2.3.8 傅立叶变换红外光谱（In-situ DRIFT） (18)
electronicmusic>back on第3章MnO2纳米催化剂在氨的SCR反应中去除NO x的结构和性能关系 (19)
3.1 样品的制备 (19)
3.2 样品的表征 (19)
3.3 结果分析与讨论 (19)
3.3.1 结构特征 (19)
3.3.2 NH3-SCR活性 (28)
3.3 原位红外分析 (34)
3.3.4 机理分析 (37)
3.4 本章小结 (38)
第4章MnFeO x纳米棒在低温通过NH3选择性催化还原NO x (41)
4.1 样品的制备 (41)
4.2 样品的表征 (41)
4.3 结果分析与讨论 (41)
4.3.1 结构性能 (41)
4.3.2 NH3-SCR活性 (48)
4.3.3 In-situ DRIFT (52)
4.3.4反应机理分析 (53)
4.4 本章小结 (54)
sign是什么意思第5章创新点、结论与展望 (57)
5.1 创新点 (57)
