锑掺杂对Mn-Ce/TiO2催化剂脱硝性能的影响

采用浸渍法制备了一系列Sb掺杂的Mn-Ce-Sb/TiO₂催化剂，考察了Sb/TiO₂摩尔比对催化剂脱硝性能的影响，采用X射线衍射、N₂吸附-脱附、NH₃程序升温脱附，H₂程序升温还原等表征手段对Mn-Ce/TiO₂和Mn-Ce-Sb/TiO₂(Sb/TiO₂摩尔比2∶10)催化剂进行表征，并对两种催化剂的脱硝性能、抗硫和抗水性能进行对比。结果表明：Sb的掺杂有利于催化剂的活性组分在载体上更好地分散，促进活性组分与载体之间的相互作用，促进低温氧化还原反应的进行；Mn-Ce-Sb/TiO₂催化剂具有较大的比表面积、较多的表面酸性位及优良的氧化还原性能，因此，与Mn-Ce/TiO₂催化剂相比，Mn-Ce-Sb/TiO₂催化剂具有更高的选择性催化还原NO活性及较好的抗硫、抗水性能。

EFFECT OF ANTIMONY DOPING ON DENITRATION PERFORMANCE OF Mn-Ce/TiO2 CATALYST

A series of Sb doped Mn-Ce-Sb/TiO₂ catalysts was prepared by impregnation method. The effect of Sb/TiO₂ molar ratio on the denitration performance of the catalysts was investigated. The catalysts Mn-Ce/TiO₂ and Mn-Ce-Sb/TiO₂ (Sb/TiO₂ molar ratio 2∶10) were characterized by XRD, BET, NH₃-TPD and H₂-TPR, and the denitration performance, sulfur resistance and water resistance of the two catalysts were compared. The results showed that Sb doping was beneficial to the dispersion of active components on the support, to the interaction between active components and support and the low temperature redox reaction. In addition, Mn-Ce-Sb/TiO₂ (2∶10) catalyst has larger specific surface area, more surface acidic sites and excellent redox performance. Therefore, compared with Mn-Ce/TiO₂ catalyst, Mn-Ce-Sb/TiO₂ (2∶10) catalyst has better SCR activity of NO_X, better resistance to sulfur and water.