Selective catalytic reduction of NOx over acid-leached mordenite catalysts
Selective catalytic reduction of NOx over acid-leached mordenite catalysts
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DOI：
10.1016/0920-5861(89)85049-7
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发表时间：
1989
期刊：
影响因子：
5.3
通讯作者：
L. Andersson;J. Brandin;C. Odenbrand
中科院分区：
文献类型：
--
作者：
L. Andersson;J. Brandin;C. Odenbrand
研究了丝光沸石催化剂选择性催化还原NO、NO2以及NO和NO2的混合物。酸浸得到的不同Si/Al比的丝光沸石催化剂的活性随丝光沸石中Al含量的增加而降低。活性随温度和酸浸的变化以及Fe和Al含量的变化表明路易斯酸是活性位点。这些路易斯酸可以是铁离子或布朗斯台德酸位点脱羟基形成的路易斯酸。浸出的丝光沸石上的 NO 还原活性与通过 IR 测量的吸附 NO + 的量相关。 NOx 还原活性显示，NO2/NOx 比率为 0.5 时转化率最大，表明 NO 氧化或 NO2 分解是整个还原过程中的限速步骤。
Selective catalytic reductions of NO, NO2and mixtures of NO and NO2over mordeninte catalysts were studied. The activity of mordenite catalysts with different Si/Al ratios, obtained through acid leaching, decreased with the Al content of the mordenite. The change activity with temperature and acid leaching together with the changes in contents of Fe and Al indicate that Lewis acids are active sites. These Lewis acids could be either Fe ions or Lewis acids formed on dehydroxylation of Broensted acid sites. Activities of NO reduction on leached mordenites were correlated to the amount of adsorbed NO+measured by IR. The activity in the reduction of NOxrevealed a maximal conversion at a NO2/NOxratio of 0.5, indicating that the oxidation of NO or the decomposition of NO2are the rate limiting step in the overall reduction.