活性炭的预处理对CeO2/AC催化剂NH3选择性催化还原NOx性能的影响

黄利华; 李雪; 陈耀强

活性炭的预处理对CeO₂/AC催化剂NH₃选择性催化还原NO_x性能的影响

1.
西南科技大学环境与资源学院, 四川绵阳 621010;
2.
四川大学化学学院, 四川成都 610064

详细信息

通讯作者:
黄利华,博士,讲师.E-mail:hlh8021@163.com

中图分类号: TO643
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出版历程
- 收稿日期: 2018-03-01
- 录用日期: 2018-06-26
- 修回日期: 2018-06-05
- 刊出日期: 2018-06-28

The effect of the oxidation method of an activated carbon on the selective catalytic reduction of NO_x with NH₃ over CeO₂/activated carbon catalysts

1.
Institute of Environment and Resource of Southwest University of Science and Technology, Mianyang 621010, China;
2.
College of Chemistry of Sichuan University, Chengdu 610064, China

摘要

摘要: 为了改善活性炭（AC）负载的CeO₂基催化剂的脱硝性能，采用空气热氧化或硝酸对活性炭进行预处理，考察了预处理方式对其负载的CeO₂基催化剂氨选择性催化还原（NH₃-SCR） NO_x反应性能的影响。对预处理后的活性炭及其负载的CeO₂基催化剂进行了红外光谱（FTIR）、NH₃程序升温脱附（NH₃-TPD）、N₂吸附-脱附、X射线衍射（XRD）及H₂-TPR等表征。结果表明：硝酸预处理显著增加了活性炭表面含氧官能团、增强了表面酸性，提高了其负载的CeO₂基催化剂的氧化还原性能，促进了催化剂表面NH₃的吸附和活化，使催化剂表现催化优异的NH₃-SCR脱硝性能。该催化剂对NO_x的起燃温度和完全转化温度分别为75℃和190℃，显著优于空气热氧化处理的活性炭制备的催化剂，但H₂O易导致催化剂活性下降。
- 活性炭 /
- 预处理 /
- CeO₂ /
- NH₃选择性催化还原 /
- NO_x
Abstract: An activated carbon (AC) was oxidized with air at 300℃ for 4 h or with 30 wt% HNO₃ at 60℃ for 4 h under reflux before it was loaded with CeO₂ by an impregnation method to prepare CeO₂/AC catalysts for the selective catalytic reduction of NO_x in flue gas with NH₃. The influence of the oxidation method on the performance of the catalysts was investigated. Both catalysts were characterized by FTIR, N₂ adsorption, XRD, temperature-programmed desorption of NH₃ and temperature-programmed reduction with H₂. Results showed that the HNO₃ oxidation increased both the number of oxygen functional groups and the surface acidity of the AC and the redox activity of the CeO₂/AC-HNO₃, which favored the adsorption and activation of NH₃ with the CeO₂/AC-HNO₃ and hence its catalytic performance. The onset and full conversion temperatures of NO_x over the CeO₂/AC-HNO₃ catalyst were 75 and 190℃, respectively, which were significantly lower than those over the CeO₂/AC-air catalyst. However, the activity of the CeO₂/AC-HNO₃ catalyst was easily inhibited by H₂O.
- Activated carbon /
- Pretreatment /
- CeO₂ /
- NH₃ selective catalytic reduction /
- NO_x

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