| 富氧条件下NO_x的选择催化还原:载体与活性组分的影响 |
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| 引用本文： | 陈栋.富氧条件下NO_x的选择催化还原:载体与活性组分的影响[J].北京工商大学学报(自然科学版),2002,20(3):7-12. |
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| 作者姓名： | 陈栋 |
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| 作者单位： | 北京工商大学,化学与环境工程学院,北京,100037 |
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| 摘 要： | 考察了不同载体 ,如微孔沸石 P、ZSM- 5和 Beta,中孔材料 MCM- 41以及 γ- Al2 O3 等负载Co催化剂在富氧条件下对丙烷选择性催化 NOx 还原的活性 .用 N2 吸附等温线、程序升温还原( TPR)及 X光光电子能谱 ( XPS)等方法表征了载体的孔结构和 Co的化学态并与反应活性关联 .结果表明 :载体的结构和孔道以及 Co组分的化学态决定了 NOx 选择催化还原活性 ,催化剂对 NOx催化转化活性次序如下 :Co/Beta>Co/ZSM- 5 Co/P≌ Co/γ- Al2 O3 >Co/MCM- 41 ,适宜的孔径以及保持 Co组分在孔道内为 Co2 + 结构是 Co/Beta活性最高的主要原因
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| 关 键 词： | 氮氧化物 选择催化还原 Co催化剂 孔结构 TPR XPS |
| 文章编号： | 1671-1513(2002)03-0007-06 |
SELECTIVE CATALYTIC REDUCTION OF NOx UNDER EXCESSIVE OXYGEN CONDITION: EFFECTS OF SUPPORTS AND COBALT SPECIES |
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| CHEN Dong.SELECTIVE CATALYTIC REDUCTION OF NOx UNDER EXCESSIVE OXYGEN CONDITION: EFFECTS OF SUPPORTS AND COBALT SPECIES[J].Journal of Beijing Technology and Business University:Natural Science Edition,2002,20(3):7-12. |
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| Authors: | CHEN Dong |
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| Abstract: | Investigated the selective catalytic reduction (SCR) of NO x by C 3H 8 in the presence of excessive oxygen for Cobalt species loaded over different supports, such as zeolite P, ZSM 5 Beta, mesoporous MCM 41 and γ Al 2O 3. The activity of catalyst has been interrelate to pore structure of support and chemical state of Cobalt species, which were characterized by N 2 isotherms, TPR and XPS. Experimental results show that both the pore size of support and the chemical state of Cobalt species determine the activity of SCR of NO x . The activity of Co containing catalysts is following the order: Co/Beta>Co/ZSM 5Co/P≌Co/ γ Al 2O 3>Co/MCM 41. The suitable pore size and the presence of pure ionic 2+ Cobalt species account for the highest activity of Co/Beta among all catalysts. |
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| Keywords: | NO x selective catalytic reduction Cobalt catalyst pore structure TPR XPS |
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