| 方祺隆,朱宝忠,孙运兰,尹寿来,訾朝辉,史金星,李国波.Mn-Fe/Al2O3催化剂的低温脱硝性能研究[J].分子催化,2018,32(4):305-314 |
| Mn-Fe/Al2O3催化剂的低温脱硝性能研究 |
| Study on the Performance of Low Temperature De-NOx Based on Mn-Fe/Al2O3 Catalysts |
| 投稿时间：2018-05-28 修订日期：2018-06-19 |
| DOI： |
| 中文关键词: Al2O3 Fe Mn 低温 选择催化还原 |
| 英文关键词:Al2O3 Fe Mn low-temperature SCR |
| 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）；安徽省教育厅重点项目（No.KJ2016A090） |
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| 中文摘要: |
| 以Al2O3为载体，Fe、Mn为活性组分，采用浸渍法制备了Mn-Fe/Al2O3催化剂，研究了Mn-Fe/Al2O3催化剂的低温脱硝性能.实验结果表明，Fe负载量为7%时，7Fe/Al2O3催化剂显示出较佳的低温脱硝性能；添加Mn能明显改变7Fe/Al2O3催化剂低温脱硝性能，其中当Mn/Fe质量比为11：7时，11Mn7Fe/Al2O3催化剂获得最佳低温脱硝效率.对催化剂的表征结果表明，比表面积和孔径的大小不是决定催化剂性能高低的主要因素；MnO2和Fe2O3在xMn7Fe/Al2O3催化剂中具有较强的相互作用，影响活性组分微观晶体结构，改善活性组分分散程度，从而提高了催化剂的低温脱硝性能；Fe的添加使催化剂表面酸性位点数目增加，从而提高7Fe/Al2O3催化剂的低温脱硝效率.添加Mn不仅增多了11Mn7Fe/Al2O3催化剂表面酸性位点数目增加，而且使催化剂表面出现新的中强性酸位点，使其低温脱硝效率进一步提高；经过详细分析，结果表明表面吸附氧Oβ、Mn4+和Fe3+的含量较高是11Mn7Fe/Al2O3催化剂脱硝活性较高的主要原因. |
| 英文摘要: |
| A series of Mn-Fe/Al2O3 catalysts which were prepared using Al2O3 as support and iron and manganese as active components by impregnation method.These catalysts were used to investigate low temperature selective catalytic reduction of NO with ammonia. The experimental results show that the 7Fe/Al2O3 catalyst exhibits the best NO<i>x conversion when the Fe loading is 7%. The denitration performance of the 7Fe/Al2O3 catalyst significantly changes with the addition of Mn, and the 11Mn7Fe/Al2O3 catalyst achieves the best low-temperature denitration efficiency when the mass ratio of Mn/Fe is 11:7. The characterization results of the catalysts show that the specific surface area is not the main factor determining the performance of the catalyst. For the xMn7Fe/Al2O3 catalyst, there are strong interactions between MnO2 and Fe2O3, which affect each other's microscopic crystal structure and improve the dispersion of the active components. The addition of Fe increases the number of acid sites on the surface of the catalyst, thereby improving the denitrification activity of the 7Fe/Al2O3 catalyst. The addition of Mn not only increases the number of acid sites on the surface of 11Mn7Fe/Al2O3 catalyst, but also makes the surface of the catalyst appear with new moderately strong acid sites, which further improves the efficiency of low-temperature denitration. The higher contents of surface adsorbed oxygen Oβ, Mn4+, and Fe3+ are the reason for high denitrification activity of 11Mn7Fe/Al2O3 catalyst. |
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