Selective catalytic oxidation of NO with O2 over Ce-doped MnOx/TiO2 catalysts

被引：89

作者：

Li, Xiaohai ^{[1
]}

Zhang, Shule ^{[1
]}

Jia, Yong ^{[1
]}

Liu, Xiaoxiao ^{[1
]}

Zhong, Qin ^{[1
]}

机构：

[1] Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China

来源：

JOURNAL OF NATURAL GAS CHEMISTRY | 2012年 / 21卷 / 01期

基金：

中国国家自然科学基金;

关键词：

selective catalytic oxidation (SCO) of NO; MnOx/TiO2; catalysts; Ce-doped catalysts; MIXED-OXIDE CATALYSTS; SURFACE-PROPERTIES; MESOPOROUS SILICA; SOOT OXIDATION; TIO2; TEMPERATURE; REDUCTION; NH3; IRON; COMBUSTION;

D O I：

10.1016/S1003-9953(11)60327-7

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A series of Ce-doped MnOx/TiO2 catalysts were prepared by impregnation method and used for catalytic oxidation of NO in the presence of excess O-2. The sample with the Ce doping concentration of Ce/Mn=1/3 and calcined at 300 degrees C shows a superior activity for NO oxidation to NO2. On Ce(1)Mn(3)Ti catalyst, 58% NO conversion was obtained at 200 degrees C and 85% NO conversion at 250 degrees C with a GHSV of 41000 h(-1), which was much higher than that over MnOx/TiO2 catalyst (48% at 250 degrees C). Characterization results implied that the higher activity of Ce(1)Mn(3)Ti could be attributed to the enrichment of well-dispersed MnOx on the surface and the abundance of Mn3+ and Ti3+ species. The addition of Ce into MnOx/TiO2 could improve oxygen storage capacity and facilitate oxygen mobility of the catalyst as shown by PL and ESR, so that its activity for NO oxidation could be enhanced. The effect of H2O and SO2 on the catalyst activity was also investigated.

引用

页码：17 / 24

页数：8

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