初湿浸渍
催化作用
选择性催化还原
氨
X射线光电子能谱
兴奋剂
化学
核化学
热液循环
无机化学
材料科学
化学工程
选择性
有机化学
光电子学
工程类
作者
Dong Zhang,Ralph T. Yang
标识
DOI:10.1016/j.apcata.2017.06.021
摘要
One-pot synthesized Cu-SAPO-34 was prepared. Fe and MnCe (at Mn/Ce = 3/7) species were doped on the Cu-SPAO-34 samples by incipient wetness impregnation. The introduction of Fe and MnCe using incipient wetness impregnation enhanced the ammonia selective catalytic reduction (SCR) activity and resulted in the best SCR performance for meeting diesel engine emission control requirement. The 1%Fe/1%MnCe/3.86%Cu-SAPO-34 catalyst showed higher hydrothermal stability than 1%Fe/1%MnCe/Cu-SSZ-13. It also exhibited higher SO2 resistance and wider temperature window, and yielded less N2O product. N2O formation was systematically investigated to study the mechanism. The catalysts were characterized by XRD, XPS, H2-TPR and NH3-TPD. The addition of Fe and MnCe increased Lewis acidity, which was beneficial to SCR activity. The lower oxidation state Fe species (Fe2+) was also responsible for the enhanced SCR activities.
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