摘要
采用浸渍法模拟低温选择性催化还原(SCR)催化剂MnOx-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。
The poisoning effects of alkali metals on low-temperature selective catalytic reduction （SCR） catalyst MnOx-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） , N2 adsorption-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 nrooerties, induce the loss in surface area and surface acidity_
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2012年第12期1487-1491,共5页
Journal of Fuel Chemistry and Technology
基金
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)
关键词
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
low-temperature selective catalyst reduction
zirconia-pillared interlayered clay
MnOx
Ce02
alkali earth metal
poisoning
