Selective catalytic reduction of nitrogen oxides with NH3 over natural manganese ore at low temperature
Selective catalytic reduction of nitrogen oxides with NH3 over natural manganese ore at low temperature
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DOI：
10.1021/ie010218
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发表时间：
2001-10-17
影响因子：
4.2
通讯作者：
Hong, SC
中科院分区：
文献类型：
--
作者：
Park, TS;Jeong, SK;Hong, SC
使用天然锰矿、纯二氧化锰和二氧化锰负载氧化铝研究了氨在低温下选择性催化还原 NOx (NO + NO2) 的情况。该催化剂在O-2存在下在低于250℃的温度下表现出用NH 3 还原NOx的高活性。三种催化剂在气相中无氧的情况下 SCR 活性的降低因晶格氧含量的不同而有所不同。在这种情况下，催化剂的 SCR 活性按 MnO2 > NMO > MnO2/γ-Al2O3 的顺序降低。少量的 SO2 在低温范围内使催化剂失活。对不同温度下硫酸化催化剂的 XRD 分析表明，硫酸铵的形成是主要的中毒途径。这些结果可能限制这些催化剂在无硫条件下的实际应用。
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.