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中文摘要：
采用等体积浸渍法在不同温度下焙烧制备了一系列 MnO2-CeO2/Zr0.25Ti0.25Al0.5O1.75 整体式催化剂样品, 并用低温 N2 吸附-脱附、储氧量、X 射线衍射、X 射线光电子能谱和 NH3 程序升温脱附等对催化剂进行了表征, 考察了催化剂上 NH3 选择性催化还原 （SCR） NO 的活性. 结果表明, 随着焙烧温度的升高, 催化剂的比表面积和孔体积逐渐减小, 平均孔径逐渐增大, 储氧能力逐渐降低. 在 500~700 oC 焙烧时, 催化剂主要以无定形或微晶的形式存在; 在 500 oC 焙烧时, 催化剂表面 Mn 与载体之间的相互作用较强, 表面酸量最高, 有利于提高 SCR 活性. 尽管在 600 和 700 oC 焙烧的催化剂仍具有较高的 SCR 活性, 且表现出一定的抗 H2O 和 SO2 性能, 但活性有所下降. 800 oC 焙烧后催化剂的活性显著降低.
英文摘要：
The MnO2-CeO2/Zr0.25Ti0. 25Al0. 5O1.75 monolith catalyst was prepared by the incipient wetness method. The influence of calcination temperature on the textural and structural properties as well as the catalytic activity for selective catalytic reduction （SCR） of NO by NH3 was investigated by N2 adsorption-desorption at low temperature, oxygen storage capacity （OSC）, X-ray diffraction, X-ray photoelectron spectroscopy, and NH3 temperature-programmed desorption. The results showed that the specific surface area, pore volume, and OSC of the catalyst decreased, while the average pore diameter increased with the increase of calcination temperature. The catalyst presented as amorphous or crystallite when calcined in the temperature range of 500-700 ℃. The catalyst calcined at 500℃ showed the largest surface acid amount and the strong interaction between the surface Mn and the support, which were beneficial to the SCR activity. The activity decreased with the increase of the calcination temperature. The activity was still considerable when the catalyst was calcined at 600 and 700 ℃, but the activity obviously decreased at 800℃.
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