| 訾朝辉,朱宝忠,孙运兰,尹寿来,李国波,朱自成,方祺隆,陈诚.MnOx/Al2O3催化剂低温SCR脱硝性能[J].分子催化,2018,32(3):249-260 |
| MnOx/Al2O3催化剂低温SCR脱硝性能 |
| Low-Temperature Selective Catalytic Reduction of NOx with Ammonia over MnOx/Al2O3 Catalysts |
| 投稿时间：2018-03-14 修订日期：2018-04-17 |
| DOI： |
| 中文关键词: 低温 SCR Mn Al2O3 |
| 英文关键词:low temperature SCR Mn Al2O3 |
| 基金项目:国家自然科学基金资助项目（No.51676001）；安徽省自然科学基金资助项目（No.1608085ME104）；高校优秀青年人才支持计划重点资助项目（No.gxyqZD2016074，gxyqZD2017038）；后备人才资助项目（（No.2017H131））；安徽省教育厅重点项目（No.KJ2016A090） |
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| 中文摘要: |
| 采用浸渍法制备了MnOx/Al2O3低温脱硝催化剂，研究了Mn的含量对MnOx/Al2O3催化剂低温烟气中NOx脱除率的影响，并通过XRD、SEM、BET、XPS、NH3-TPD和H2-TPR等手段对催化剂进行了表征.结果表明，当Mn含量为9%，空速为45 000 h-1时，MnOx/Al2O3催化剂NOx脱除率最高，在220℃时达79%；9MnOx/Al2O3催化剂表面MnOx氧化物分散较均匀，且稳定性及抗H2O性能较好，但抗SO2性能有待提高；MnOx/Al2O3催化剂孔径主要分布在4~20 nm范围内，Mn含量对催化剂孔径变化影响较小；催化剂中活性组分Mn主要以Mn3+和Mn4+的形式存在；Mn4+和Oα含量增加有利于NOx的脱除；且添加Mn后，活性酸位点的数量增长，增强了催化剂还原能力，促进了NOx脱除率的增加. |
| 英文摘要: |
| MnOx/Al2O3 low-temperature denitration catalyst was prepared by impregnation method to investigate the effects of manganese content on the NOx conversions at low temperature. These catalysts were characterized by X-ray diffraction (XRD), N2 adsorption-desorption isotherms analysis, X-ray photoelectron spectroscopy (XPS), temperature programmed desorption of NH3 (NH3-TPD) and temperature program reduction by hydrogen (H2-TPR).The results show that the MnOx/Al2O3 catalyst with 9% Mn exhibits the best NOx conversion for a 45 000 h-1 space velocity, and the NOx conversion reaches 80.7% at 220℃. The MnOx oxide on the surface of the 9MnOx/Al2O3 catalyst disperses more uniformly, and the stability and the resistance to H2O are good, but the sulfur-resisting characteristics should be improved. The pore size of the catalyst is mainly concentrated at 4~20 nm, and the pore sizes change little with the increase of Mn loading. The active components on the catalyst surface are mainly Mn3+ and Mn4+. The increase of Mn4+ and Oα contents are beneficial to improve the NOx conversion of MnOx/Al2O3 catalyst. After Mn loading can provide more active acid sites, improve the reduction capacity of the catalyst, and promote catalyst activity. |
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