摘要利用氨气作为还原剂来选择性催化还原NOx进而生成N2的技术是去除移动源和固定源中的NOx实用性最强的技术，即NH3-SCR技术。其中整个技术中最核心的就是钒基催化剂体系。因NH3-SCR技术中采用的传统V2O5-WO3/TiO2体系具有高温稳定性差、操作温度窗口窄等缺点而在应用中受限。所以本文从钒基催化剂的制备方法着手，采用共沉淀法与浸渍法相结合的方法对不同配比钒基催化剂的活性进行系统研究，选择出性能较优的催化剂，并与通过采用湿法浸渍法制得的传统V2O5-WO3/TiO2催化剂进行对比分析活性。结果表明，采用共沉淀法与浸渍法结合制备的V2O5/W0.2TiOx催化剂较传统的V2O5-WO3/TiO2催化剂高温稳定性更好。这对于开发高效、稳定、环境友好的催化剂体系来替代传统钒基催化剂用于NOx净化具有一定的启示意义。19045
关键词 氨选择性催化还原 钒基催化剂 高温稳定性 催化剂改进
毕业设计说明书（论文）外文摘要
Title:Improvement of Vanadium-Based Catalysts for the Selective Catalytic Reduction of NOx with NH3.
Abstract
Selective catalytic reduction of NOx to N2 with NH3 as reducing agents over catalytic materials is one of the most efficient and widely-used technique for the removal of NOx from mobile sources and stationary, i.e. NH3-SCR technology. The most important is vanadium-based catalyst system.But conventional NH3-SCR catalyst system V2O5-WO3/TiO2 owing to poor temperature stability, narrow operating temperature window and other shortcomings in the practical application is limited. From the preparation of vanadium-based catalyst to start, by co-precipitation method and impregnation method are combined with different ratios of active vanadium-based catalyst system to research, choose the optimum performance of the catalyst, and with the preparation of the wet impregnation V2O5-WO3/TiO2 catalyst analyze and compare performance . The results show that the co-precipitation method and impregnation method with prepared V2O5/ W0.2TiOx catalyst temperature has better performance than traditional V2O5-WO3/TiO2 .This is for the development of efficient, stable and environmentally friendly to replace traditional vanadium-based catalysts systems for NOx purification have some enlightenment.
Keywords: selective catalytic reduction of ammonia vanadium-based high temperature stability improvement of catalysts.
目 录
1 绪论 1
1.1 柴油车尾气NOx的处理 1
1.1.1 柴油车尾气NOx污染现状 1
1.1.2 柴油车尾气NOx的处理技术现状 1
1.2 NH3-SCR技术的催化剂 2
1.2.1 钒基氧化物催化剂 3
1.2.2 非钒金属氧化物催化剂 3
1.2.3 分子筛催化剂 5
1.3 催化反应机理 6
1.4 论文研究意义及实验设计 7
1.4.1 研究目的 7
1.4.2 研究实验设计 7
2 实验部分 8
2.1 实验药品和仪器设备 8
2.1.1 实验药品 8
2.1.2 实验仪器及设备 8
2.2 SCR反应实验装置 9
2.2.1 配气系统 9
2.2.2 反应系统 9
2.3 催化剂的制备 9
2.4 催化剂活性的评价 10
3 结果与讨论 12
3.1 W/Ti摩尔比对催化剂活性的影响 12
3.2 反应空速对催化剂活性的影响 14
3.3 与传统催化剂的活性高温焙烧对比 15 对传统V2O5-WO3/TiO2催化剂的选择性催化还原NOx性能的改进 :http://www.youerw.com/huaxue/lunwen_10244.html