Selective catalytic reduction of nitrogen oxides with NH3 over natural manganese ore at low temperature

被引：121
作者：
Park, TS
Jeong, SK
Hong, SH
Hong, SC
机构：
[1] Korea Univ, Dept Chem Engn, Sungbuk Gu, Seoul 136701, South Korea
[2] KOPEC Ltd, Yongin 449713, Kyonggi Do, South Korea
[3] Kyonggi Univ, Dept Environm Engn, Paldal Gu, Suwon 442760, Kyonggi Do, South Korea
来源：
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2001年 / 40卷 / 21期
关键词：
D O I：
10.1021/ie010218+
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The selective catalytic reduction of NOx (NO + NO2) at low temperature with ammonia has been investigated with natural manganese ore, pure manganese dioxide, and manganese dioxide supported alumina. The catalysts showed high activities for NOx reduction with NH3 in the presence Of O-2 at temperatures below 250 degreesC. The decrease of SCR activity without oxygen in the gas phase differed among the three catalysts in accord with their differing amounts of lattice oxygen. The SCR activity of the catalysts, in that case, decreased in the order MnO2 > NMO > MnO2/gamma -Al2O3. Small amounts Of SO2 deactivated the catalysts in the low-temperature range. An XRD analysis of the sulfated catalysts with differing temperature provides evidence that the formation of ammonium sulfates is the main poisoning route. These results could restrict the practical application of these catalysts to sulfur-free conditions.
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页码：4491 / 4495
页数：5
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