碱土金属对MnOx-CeO2/ZrO2-PILC催化剂SCR活性影响研究

沈伯雄; 陈建宏; 姚燕; 胡国丽

碱土金属对MnO_x-CeO₂/ZrO₂-PILC催化剂SCR活性影响研究

南开大学环境科学与工程学院, 天津 300071

基金项目: 国家自然科学基金(51176077,50976050); 天津市自然科学基金(12JCZDJC29300); 环保公益性行业科研专项经费(201109004)。

详细信息

通讯作者:
沈伯雄, 教授, Tel: 18622132754, E-mail: shenbx@nankai.edu.cn。

中图分类号: X701
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出版历程
- 收稿日期: 2012-02-08
- 修回日期: 2012-05-28
- 刊出日期: 2012-12-31

Effects of alkali metals on catalyst of MnO_x-CeO₂/ZrO₂-PILC in the low-temperature selective catalytic reduction

College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China

摘要

摘要: 采用浸渍法模拟低温选择性催化还原(SCR)催化剂MnO_x-CeO₂/ZrO₂-PILC的碱土金属中毒特性,研究了碱土金属及其负载量对中毒程度的影响。实验表明,钙/镁的添加会引起催化剂中毒,催化剂中毒失活程度与碱土金属的负载量有关。运用 X射线衍射(XRD)、H₂程序升温还原( H₂-TPR)、氮气吸脱附及 NH₃程序升温脱附(NH₃-TPD)对新鲜催化剂以及碱土金属中毒后的催化剂进行了表征。结果表明,钙/镁中毒后催化剂的比表面积降低、催化剂氧化还原性和表面酸性减少,进而造成催化剂失活。
- 低温选择性催化还原 /
- 锆基层柱黏土 /
- 氧化锰 /
- 氧化铈 /
- 碱土金属氧化物 /
- 中毒
Abstract: The poisoning effects of alkali metals on low-temperature selective catalytic reduction (SCR) catalyst MnO_x-CeO₂/ZrO₂-PILC were invested by the method of impregnation in the laboratory. It was indicated that the addition of Ca/Mg would decrease the activities of the catalyst, and the poisoning effects were contacted with the amount and acidity of the doped-alkali metal. X-ray diffraction (XRD), H₂-temperature programmed reduction (H₂-TPR), N₂adsorption-desorption and temperature-programmed desorption of NH₃ (NH₃-TPD) were used to characterize the properties of the fresh and alkali earth doped catalysts. According to the results, the doped-alkali metals would inhibit the reduction properties, induce the loss in surface area and surface acidity.
- low-temperature selective catalyst reduction /
- zirconia-pillared interlayered clay /
- MnO_x /
- CeO₂ /
- alkali earth metal /
- poisoning

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