| 李航航,赵炜,王谦,吴里程.B改性钒钛催化剂低温NH3-SCR还原NOx[J].分子催化,2021,35(2):121-129 |
| B改性钒钛催化剂低温NH3-SCR还原NOx |
| Boron-modified Vanadia/titania Catalyst for Low-temperature NH3-SCR of NOx |
| 投稿时间：2020-11-08 修订日期：2021-01-13 |
| DOI：10.16084/j.issn1001-3555.2021.02.003 |
| 中文关键词: B改性 催化剂 选择性催化还原 SCR活性 脱硝率 |
| 英文关键词:boron-modified catalyst selective catalytic reduction SCR activity NOx removal efficiency |
| 基金项目:国家自然科学基金（51506077）；江苏省自然科学基金（BK20150488）；江苏省高校自然科学基金（15KJB610003）；江苏大学高级人才基金（15JDG156） |
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| 中文摘要: |
| 选择性催化还原（SCR）技术是降低柴油机NOx排放的常用技术，其核心部件为催化剂.目前最广泛使用的催化剂为V2O5/TiO2催化剂，但其存在一些缺点，如低温活性不佳、活性温度窗口较窄等.为了解决该催化剂存在的上述一系列问题，我们对V2O5/TiO2催化剂进行改性处理.采用溶胶-凝胶法和浸渍法制备了B改性的V2O5/TiO2催化剂，在标准工况下，在催化剂活性测试平台上对B改性后的催化剂进行活性测试实验，采用XRD、BET和NH3-TPD对催化剂结构进行表征.实验结果表明B改性能有效增大催化剂的比表面积和孔容，使催化剂表面弱酸量增加，进而表现出较高活性和稳定性.此外，研究了空速、氧气浓度、氨氮比以及SO2和H2O （g）对催化剂选择性催化还原NOx的影响.结果表明，改性催化剂具有较好的抗硫、抗水中毒能力. |
| 英文摘要: |
| Selective Catalytic Reduction (SCR) technology is a common method to reduce NOx emissions from diesel engines. The catalyst is the core component of the SCR process. The most widely used catalyst is V2O5/TiO2 catalyst, but it has some defects, such as poor low-temperature activity, narrow active temperature window, etc. In order to solve above-mentioned problems, a series of B-modified V2O5/TiO2 catalyst was prepared by the sol-gel and the impregnation methods. The activity test experiment of the B-modified catalyst was carried out on the catalyst activity test platform. The microstructure and acid site were investigated by XRD, BET and NH3-TPD methods. The results showed that the B modification could increase the specific surface area and the pore volume of the catalyst, and enhance the weak acid sites, which may result in high activity and stability of the catalyst. In addition, the effects of space velocity, O2 concentration, NH3/NO ratio, SO2 concentration and water vapor on the catalyst for selective catalytic reduction of NOx by NH3 were studied. The results show that the catalyst has preferable applicability and strong sulfur tolerance and hydrothermal stability. |
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