Mesoporous MnOx-CeO2 composites for NH3-SCR: the effect of preparation methods and a third dopant

被引：21

作者：

Li Weiman ^{[1
,2
,3
,4
]}

Liu Haidi ^{[1
]}

Chen Yunfa ^{[1
,4
]}

机构：

[1] Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China

[3] Zhongke Langfang Inst Proc Engn, Langfang Econ & Tech Dev Zone,Fenghua Rd 1, Langfang, Hebei, Peoples R China

[4] CAS Ctr Excellence Urban Atmospher Environm, Xiamen 361021, Peoples R China

来源：

RSC ADVANCES | 2019年 / 9卷 / 21期

关键词：

SELECTIVE CATALYTIC-REDUCTION; LOW-TEMPERATURE SCR; SO2; TOLERANCE; REACTION-MECHANISM; OXIDE CATALYSTS; NO REMOVAL; NI; RESISTANCE; NH3; CE;

D O I：

10.1039/c9ra00731h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this study, different preparation methods including an oxalate route, a nano-casting strategy and a traditional co-precipitation route were applied to obtain MnOx-CeO2 mixed oxides for selective catalytic reduction (SCR) of NO with NH3. The catalyst prepared from the oxalate route showed improved performance for NOx conversion and SO2 + H2O durability. To further improve the SO2 and H2O resistance of catalysts, ternary oxides were prepared from the oxalate route. The catalysts were studied by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis, X-ray photoelectron spectroscopy (XPS), H-2 temperature-programmed reduction (H-2-TPR), NH3 temperature-programmed desorption (NH3-TPD), SO2 temperature-programmed desorption (SO2-TPD), and in situ diffuse reflectance infrared fourier transform spectroscopy (in situ DRIFTS). The nickel-manganese-cerium ternary oxide showed the best SO2 and H2O durability. The reason can be ascribed to its smaller pores, amorphous structure, and moderate amount of surface Mn3+/oxygen species, which could decrease chemical adsorption of SO2.

引用

页码：11912 / 11921

页数：10