V2O5-Sb2O3-TiO2催化剂 低温NH3还原NO及其抗H2O和SO2毒化性能

曹政; 黄妍; 彭莉莉; 李建光

V₂O₅-Sb₂O₃-TiO₂催化剂低温NH₃还原NO及其抗H₂O和SO₂毒化性能

曹政^1,2,
黄妍^1,,
彭莉莉¹,
李建光¹

1.
湘潭大学化工学院环境工程系, 湖南湘潭 411105;
2.
包钢钢联给水厂,内蒙古包头 014000

基金项目: 湖南省科技厅项目(2011FJ3090); 湖南省自然科学基金(07JJ4003)。

详细信息

通讯作者:
黄妍, E-mail: xtuhy@163.com。

中图分类号: O643.3
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出版历程
- 收稿日期: 2011-04-11
- 修回日期: 2011-07-29
- 刊出日期: 2012-04-30

Selective catalytic reduction of NO with ammonia over V₂O₅-Sb₂O₃-TiO₂ at low temperature and resistance to H₂O and SO₂ poisoning

1.
Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, China;
2.
Baotou Iron and Streel Group Co., Ltd., Baotou 014000, China

摘要

摘要: 浸渍法制备了催化剂V₂O₅-Sb₂O₃-TiO₂,考察了V₂O₅、Sb₂O₃负载量、pH值和焙烧温度对催化剂V₂O₅- Sb₂O₃-TiO₂低温氨选择性催化还原(SCR)NO活性的影响;同时,考察了催化剂V₂O₅-Sb₂O₃-TiO₂抗H₂O和SO₂毒化性能。结果表明,V₂O₅和Sb₂O₃负载量分别为5%和2%、焙烧温度为400℃、pH值为4时,催化剂SCR活性最好,反应温度220℃时,可达97%。Sb₂O₃的加入不仅能增强V₂O₅/TiO₂的催化活性,而且能明显提高催化剂的抗H₂O和SO₂毒化性能。SO₂、NO吸附暂态反应和TG-DTG测试表明,Sb₂O₃的促进机制主要是促进了催化剂在SO₂存在条件下对NO的吸附,同时,减弱了硫酸铵盐与催化剂之间的相互作用,硫酸铵盐更容易分解。
- V₂O₅-Sb₂O₃ -TiO₂ /
- 低温 /
- 选择性催化还原 /
- NO
Abstract: The V₂O₅-Sb₂O₃-TiO₂ catalyst was prepared by impregnation method. The influences of V₂O₅and Sb₂O₃ loading, pH value, and calcination temperature on the low temperature selective catalytic reduction (SCR) activities of NO with ammonia over V₂O₅-Sb₂O₃-TiO₂ catalyst were studied. The performance of V₂O₅-Sb-TiO₂ catalyst in resisting the H₂O and SO₂ poisoning was also discussed. The results show that the catalyst has the best SCR activity. When the V₂O₅ and Sb₂O₃ loading is 5% and 2%, respectively, the calcination temperature is 400℃, and the pH value is 4. The NO removal efficiency of 97% is obtained at the reaction temperature of 220℃. The addition of Sb₂O₃ not only strengthens the catalytic activity of V₂O₅-TiO₂, but also improves the resistance to the deactivation by both H₂O and SO₂. The SO₂ and NO adsorption transient response and TG-DTG test demonstrate that the promoting mechanism of Sb₂O₃is mainly to promote the catalyst adsorption of NO, and weaken the interaction between ammonium sulfate and the catalyst, which can result in the decomposition of ammonium sulfate easier.
- V₂O₅-Sb₂O₃ -TiO₂ /
- low temperature /
- selective catalytic reduction /
- NO

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参考文献(24)

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