| 宋忠贤,宁平,李昊,张秋林,张金辉,张腾飞,黄真真.不同Ce/Mn摩尔比对CeO2-MnOx催化剂低温NH3选择性催化还原NO的影响[J].分子催化,2015,(5):422-430 |
| 不同Ce/Mn摩尔比对CeO2-MnOx催化剂低温NH3选择性催化还原NO的影响 |
| Effect of Ce/Mn Molar Ratios on the Low-Temperature Catalytic Activity of CeO2-MnOx Catalyst for Selective Catalytic Reduction of NO by NH3 |
| 投稿时间：2015-08-12 修订日期：2015-10-21 |
| DOI： |
| 中文关键词: 选择性催化还原 低温活性 酸性位点 Mn4+物种 |
| 英文关键词:selective catalytic reduction low-temperature catalytic activity acid sites manganese oxides |
| 基金项目:国家自然科学基金 |
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| 中文摘要: |
| 以高锰酸钾和硝酸锰为锰源，采用改进的共沉淀法制备了不同Ce/Mn摩尔比的CeO2-MnOx催化剂。以NH3为还原剂，考察了催化剂低温（小于150 oC）NH3选择性催化还原NO的性能。并采用XRD, BET, H2-TPR, NH3-TPD和XPS等手段对催化剂的物理化学性质进行表征。结果表明，CeO2-MnOx催化剂在50-150 oC温度区间内表现出了良好的催化活性。引入适量的Ce可以有效地改变催化剂的晶粒大小，增强其氧化还原能力；而Mn的加入，促进了其低温SCR活性。当Ce/Mn摩尔比为1:3时(C1M3)，低温活性最佳，在82-150 oC温度区间内NO去除率达到90%以上，这主要是由于C1M3催化剂有较高含量的表面吸附氧、大量的弱酸性位点、良好的氧化还原性能以及表面较高含量的Mn4+物种。 |
| 英文摘要: |
| CeO2-MnOx catalysts were prepared by improved co-precipitation method using potassium permanganate and manganese nitrate as manganese sources, and the effect of different Ce/Mn molar ratio on the SCR performance was investigated. The catalysts were characterized by XRD, BET, H2-TPR, NH3-TPD and XPS. The results indicated that the CeO2-MnOx catslysts exhibited the excellent catalytic activity at 50-150 oC. The crystal sizes and redox properties of CeO2-MnOx catalysts were dramatically affected with the addition of Ce speices, and the introduction of Mn species could contribute to the low-temperature catalytic activity. When the Ce/Mn molar ratio was 1:3 (C1M3), the C1M3 catalyst showed the best catalytic activity and above 90% NO conversion was obtained at 82-150 oC. The excellent SCR activity of C1M3 was attributed to its higher surface oxygen species, its excellent redox property, its abundant weak acid sites and its higher surface Mn4+ species, which were dependent on the Ce/Mn malor ratios. |
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