TiO2与Al2O3载体对V基催化剂脱硝活性影响的研究

摘要采用过量浸渍法制备一系列不同的钒负载量的V2O5/TiO2和V2O5/Al2O3催化剂，对各催化剂进行NH3选择性催化还原NOx性能评价，实验结果表明，V2O5/TiO2催化剂在脱硝活性明显高于V2O5/Al2O3催化剂。在此基础上，采用DFT理论计算以及XRD、Uv-vis、EIS、XPS和EPR等表征分析催化剂。计算与表征结果显示， VTi本身的激发电子能力和传递电荷能力强于VAl，而V基为吸电基，该机制促进了还原态V2O5物种的生成，其作为超氧自由基形成的中心能够促进催化剂表面超氧自由基数量的增加，因此VTi体系催化剂具有较高的脱硝活性。20685
关键词 V2O5/TiO2催化剂 V2O5/Al2O3催化剂 DFT 还原态V2O5 超氧自由基
毕业论文设计说明书（论文）外文摘要
Title   The study on the influence of TiO2 and Al2O3 carrier on the
         denitration activity of V-based catalyst
Abstract
V2O5/Al2O3 and V2O5/TiO2 catalysts with different vanadium loadings were prepared by excessive impregnation method. For all the catalysts, the performance evaluation of selective catalytic reduction (SCR) of NO with NH3 were measured. The experimental results showed that the activity of V2O5/TiO2 catalysts was significantly higher than V2O5/Al2O3 catalysts in the denitration. On this basis, we analyzed the catalysts by the use of DFT theoretical calculations and XRD, Uv-vis, EIS, XPS and EPR characterization methods. The calculation and characterization results showed that the electron excitation and charge transfer of the V2O5/TiO2 catalyst were stronger than the V2O5/Al2O3 catalyst.Considering of the V2O5 was the electron withdrawing group, therefore, the reduced V2O5 might more easily form over the V2O5/TiO2 catalyst, and the reduced V2O5 resulted in the increase of the amounts of superoxide ions as the formation center of the superoxide ions.Therefore, the VTi catalyst system has a higher denitration activity.
Keywords V2O5/Al2O3 catalysts V2O5/TiO2 catalysts DFT Reduced V2O5 Superoxideions
目   次
1 引言    1
1.1 研究背景    1
1.1.1 氮氧化物（NOx）的危害及控制技术    1
1.1.2 选择性催化还原（SCR）工艺的基本原理    2
1.1.3 选择性催化还原（SCR）工艺流程布置    3
1.1.4 国内外SCR应用情况    4
1.2 SCR催化剂研究进展    4
1.2.1 贵金属催化剂    5
1.2.2 金属氧化物催化剂    5
1.2.3 分子筛催化剂    7
1.2.4 碳基催化剂    8
1.3 实验思路及要解决的问题    8
    2 实验    9
2.1 催化剂的制备    9
2.2 活性测试    11
2.3 催化剂的表征    12
2.3.1 X射线衍射分析    12
2.3.2 紫外可见吸收光谱    13
2.3.3 催化剂阻抗测试    13
2.3.4 X射线光电子能谱    13
2.3.5 电子顺磁共振技术    13
2.4 仪器与试剂    13
2.4.1 实验仪器    13
2.4.2 实验试剂    14
    3 结果与讨论    16
3.1 不同负载量的V/Ti和V/Al催化剂活性测试结果    16 TiO2与Al2O3载体对V基催化剂脱硝活性影响的研究:http://www.youerw.com/huaxue/lunwen_12559.html