| Mn掺杂Ce0.7Zr0.3O2催化剂同时去除碳烟和氮氧化物的性能 |
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| 引用本文： | 朱昌权,梁 红,李树华,洪燕霞,叶代启.Mn掺杂Ce0.7Zr0.3O2催化剂同时去除碳烟和氮氧化物的性能[J].无机化学学报,2011,27(6):1093-1100. |
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| 作者姓名： | 朱昌权 梁 红 李树华 洪燕霞 叶代启 |
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| 作者单位： | 1. 广州大学化学化工学院,广州,510006
2. 华南理工大学环境科学与工程学院,广州,510006 |
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| 基金项目： | 广东省自然科学基金，广东省社会发展科技项目 |
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| 摘 要： | 采用柠檬酸络合燃烧法制备了一系列x%Mn/Ce0.7Zr0.3O2(x=0,5,10,15,30,50)复合金属氧化物催化剂,对其同时去除柴油机尾气中碳烟颗粒物(PM)和氮氧化物(NOx)反应的催化活性进行了评价,并采用XRD、低温氮吸附-脱附、H2-TPR、O2-TPD和原位漫反射红外光谱(in situ DRIFTS)等技术对催化剂的性能进行了表征。结果表明,不同含量Mn掺杂入铈锆固溶体中均形成了三元固溶体催化剂,在同时去除PM和NOx的催化反应中,固溶体催化剂的催化活性与其氧化能力直接相关。其中30%Mn/Ce0.7Zr0.3O2催化剂具有较好的同时去除PM和NOx的催化活性,催化去除PM的Ti和Tm分别为298和504℃,NO的转化率达到30.6%。结合O2-TPD和原位红外结果可知,30%Mn/Ce0.7Zr0.3O2表面吸附的超氧物种(O2-)及其与NO反应生成的硝酸盐物种(NO3-)是同时去除PM和NO反应的主要活性物种,进而指出PM和NO在30%Mn/Ce0.7Zr0.3O2表面反应过程中形成了异氰酸盐(-NCO)中间物种,在原位红外实验的基础上提出了30%Mn/Ce0.7Zr0.3O2复合氧化物催化剂同时去除PM和NOx的反应机理。
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| 关 键 词： | 铈锆固溶体 碳烟颗粒物 氮氧化物 原位红外 |
Performance of Mn Doped Ce0.7Zr0.3O2 Catalysts for Simultaneous Removal of PM and NOx |
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| ZHU Chang-Quan,LIANG Hong,LI Shu-Hu,HONG Yan-Xia and YE Dai-Qi.Performance of Mn Doped Ce0.7Zr0.3O2 Catalysts for Simultaneous Removal of PM and NOx[J].Chinese Journal of Inorganic Chemistry,2011,27(6):1093-1100. |
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| Authors: | ZHU Chang-Quan LIANG Hong LI Shu-Hu HONG Yan-Xia and YE Dai-Qi |
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| Institution: | College of Chemistry and chemical Engineering, Guangzhou University, Guangzhou 510006, China,College of Chemistry and chemical Engineering, Guangzhou University, Guangzhou 510006, China,College of Chemistry and chemical Engineering, Guangzhou University, Guangzhou 510006, China,College of Chemistry and chemical Engineering, Guangzhou University, Guangzhou 510006, China and College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China |
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| Abstract: | A series of x%Mn/Ce0.7Zr0.3O2(x=0,5,10,15,30,50) metal oxide catalysts were prepared by complexing combustion method with citric acid.The catalysts have been investigated to remove of carbon particulate matter(PM) and nitrogen oxides(NOx) emitted from diesel engines.The samples were characterized by XRD,low temperature adsorption-desorption,H2-TPR,O2-TPD and in situ Diffuse Reflectance IR Fourier-Transform spectroscopy(in situ DRIFTs).The results indicate that the ceria-zirconia solid solutions with differe... |
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| Keywords: | ceria-zirconia solid solutions PM NOx in situ DRIFTS |
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