标题：Selective catalytic reduction of NOxwith NH3over titanium modified FexMgyOzcatalysts: Performance and characterization
作者：Xu, Liting ;Niu, Shengli ;Wang, Dong ;Lu, Chunmei ;Zhang, Qi ;Zhang, Kang ;Li, Jing
作者机构：[Xu, Liting ;Niu, Shengli ;Lu, Chunmei ;Zhang, Qi ;Zhang, Kang ] School of Energy and Power Engineering, Shandong University, Jinan; 250061, China;[Li 更多
来源：Journal of Industrial and Engineering Chemistry
摘要：A series of titanium modified FexMgyOzcatalysts were prepared by coprecipitation method and impregnation-coprecipitation method with microwave assistant and their catalytic capability in selective catalytic reduction (SCR) was evaluated. Appropriate amount of either titanium or TiO2could both improve the catalytic performance of FexMgyOzcatalyst, especially above 350 °C. 7.5%Ti–FexMgyOzcatalyst with wide temperature range of 225–400 °C could achieve the maximum NOxconversion of 100%, while FexMgyOz/TiO2(b) catalyst exhibited the best catalytic performance in the present of H2O and SO2. Characterization results exhibited that γ-Fe2O3was the main active phase, TiO2was mainly in the form of anatase TiO2and both titanium and magnesium existed in amorphous phase. The crystalline grain could be refined with the addition of either titanium or TiO2, as well as the increase of BET surface area and pore volume. The acid sites, redox ability and the chemisorbed oxygen were the most important factors in SCR reaction. The introduction of titanium and TiO2had the effect of increasing the strength of the acid sites, which could attribute to the improvement of catalytic performance over titanium modified FexMgyOzcatalysts.
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