| 焙烧温度对Mn-Fe/CeO2-TiO2催化剂低温NH3选择性催化还原NO的影响 |
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| 引用本文： | 吴大旺,张秋林,林涛,龚茂初,陈耀强.焙烧温度对Mn-Fe/CeO2-TiO2催化剂低温NH3选择性催化还原NO的影响[J].化学研究与应用,2012,24(5):705-709. |
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| 作者姓名： | 吴大旺 张秋林 林涛 龚茂初 陈耀强 |
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| 作者单位： | 1. 黔南民族师范学院化学与化工系,贵州都匀 558000;四川大学绿色化学与技术教育部重点实验室,四川成都 610064
2. 四川大学绿色化学与技术教育部重点实验室,四川成都,610064 |
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| 基金项目： | 贵州省教育厅自然科学基金，国家自然科学基金 |
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| 摘 要： | 采用等体积浸渍法制备了Mn-Fe/CeO2-TiO2催化剂,考察了不同焙烧温度对其NH3选择性催化还原(SCR)NO活性及催化剂性能的影响。并用N2吸附-脱附,X射线衍射(XRD)和X射线光电子能谱(XPS)等手段对催化剂进行了表征。活性结果表明,随着焙烧温度的升高,Mn-Fe/CeO2-TiO2催化剂的催化活性先升高后降低。其中焙烧温度为500℃时Mn/CeO2-TiO2的NH3-SCR活性最佳,该催化剂在113～250℃之间表现出了良好NO去除效率。表征结果表明,500℃焙烧时,催化剂中Fe和Mn物种在CeO2-TiO2表面的分散效果最好。500℃焙烧时Mn-Fe/CeO2-TiO2表面Mn以+4价存在,Fe以+3、+2价存在,而Ce以+4、+3存在。
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| 关 键 词： | 焙烧温度 选择性催化还原(SCR) 氮氧化物 |
Effect of calcination temperature on performance of Mn-Fe/CeO2-TiO2catalyst for selective catalytic reduction of NO by NH3 at low temperature |
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| WU Da-wang
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ZHANG Qiu-lin
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LIN Tao
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GONG Mao-chu
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CHEN Yao-qiang.Effect of calcination temperature on performance of Mn-Fe/CeO2-TiO2catalyst for selective catalytic reduction of NO by NH3 at low temperature[J].Chemical Research and Application,2012,24(5):705-709. |
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| Authors: | WU Da-wang ZHANG Qiu-lin LIN Tao GONG Mao-chu CHEN Yao-qiang |
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| Institution: | 1.Chemistry and Chemical Engineering Department,Qiannan Normal University,Duyun 558000,China; 2.The key laboratory of Green Chemistry&Technology(Sichuan University),Ministry of Education,Chengdu 610064,China) |
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| Abstract: | The Mn-Fe/CeO2-TiO2 catalyst was prepared by the incipient wetness method,the influence of calcination temperature on the property and catalytic activity of Mn-Fe/CeO2-TiO2 was studied for selective catalytic reduction(SCR)of NO by NH3.The catalysts were characterized by N2-adsorption-desorption,X-ray diffraction and X-ray photoelectron spectroscopy.The performance results showed that the catalytic activities were first increased and subsequently decreased with the increase of calcination temperature.The catalyst calcined at 500℃ showed the best activity for NO reduction by NH3,and this catalyst exhibited high NO conversion in a wide temperature range of 113-250℃.The characterization results revealed that the Mn-Fe/CeO2-TiO2 catalyst calcined at 500℃ promoted the dispersion of Mn and Fe species on CeO2-TiO2.The XPS results indicated that the Mn species was existed in a valence of+4,Fe species was existed as a mixed valence of+3 and+2 and Ce species was a mixed valence of existed as+4 and+3. |
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| Keywords: | calcination temperature selective catalytic reduction(SCR) nitrogen oxides |
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