Abstract Self-made porous halloysite/carbon composite (HAL/C) was used as a novel catalyst carrier which was prepared using halloysite as template, chitosan as carbon source and potassium carbonate as activating agent via one-step carbonization-activation. Then the manganese oxides (MnOx) supported HAL/C catalyst was prepared by impregnation method. The influences of contents of Mn and carbon in catalyst on the low-temperature selective catalytic reduction of NO by NH3 (NH3-SCR) were investigated. The Mn12-HAL/C-2 catalyst (mass ratio of chitosan to halloysite was 2 and Mn loading content was 12 wt%) exhibited the highest SCR performance, giving an NO conversion of 95–100% in the temperature range of 150–300 °C. For Mn12-HAL catalyst without carbon loading, the highest conversion of NO was 89% at 250 °C. Thus it could be inferred that the introduction of carbon could greatly improved low-temperature SCR performance. The addition of carbon contributed to a larger specific surface (1805 m2/g) for abundant oxygen-containing functional groups and weak acid sites for Mn12-HAL/C-2 catalyst which was favorable to adsorb more NH3 and facilitated SCR reaction process. As the increase of carbon, the weight loss of catalysts increased at higher temperature and the catalytic activity was declined.

中文翻译：

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负载锰氧化物的多孔埃洛石/碳复合材料的合成及催化性能用于 NH3 选择性催化还原 NO

摘要 以埃洛石为模板，壳聚糖为碳源，碳酸钾为活化剂，一步碳化-活化，制备了自制多孔埃洛石/碳复合材料（HAL/C）作为新型催化剂载体。然后通过浸渍法制备了锰氧化物(MnOx)负载的HAL/C催化剂。研究了催化剂中Mn和碳含量对NH3低温选择性催化还原NO(NH3-SCR)的影响。Mn12-HAL/C-2 催化剂（壳聚糖与埃洛石的质量比为 2，Mn 负载量为 12 wt%）表现出最高的 SCR 性能，在 150-300 的温度范围内，NO 转化率为 95-100% ℃。对于无碳负载的 Mn12-HAL 催化剂，NO 的最高转化率在 250 °C 时为 89%。因此可以推断，碳的引入可以大大提高低温 SCR 性能。碳的加入有助于为 Mn12-HAL/C-2 催化剂提供更大的含氧官能团和弱酸性位点的更大比表面积 (1805 m2/g)，有利于吸附更多的 NH3 并促进 SCR 反应过程。随着碳的增加，催化剂在较高温度下的失重增加，催化活性下降。