期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 363, 期 -, 页码 439-446出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.09.054
关键词
NO oxidation; CePO4; Selective catalytic reduction; Langmuir-Hinshelwood (LH) mechanism; Monodentate nitrates
资金
- National Natural Science Foundation of China [21403167]
- Yanchang Petroleum Group Supporting Program [JT4117SKF0012]
- Shaanxi Province Key Scientific Research Project [2017ZDXM-GY-083]
- Shanxi Key Scientific and Technological Innovation Team [2016KCT-15]
The MOx (M = Cu, Mn, Co)/CePO4 support was firstly prepared via the hydrothermal and impregnated method. Selective catalytic reduction of NO with NH3 (NH3-SCR) results showed that the MnOx, modifications greatly improved the SCR activities at low temperatures. The NOx conversion of the MnOx/CePO4 catalyst was above 80% even at 180 degrees C. In-situ DRIFTS results suggest that the SCR reaction is majorly conducted between the absorbed monodentate nitrate and NH3 species (i.e., the Langmuir-Hinshelwood mechanism). MOx (M = Cu, Mn, Co) exists in the formation of nano-size particles obtained by SEM and TEM directly. These nano-size particles can provide active surface adsorbed oxygen and thus improve the NO oxidation ability as indicated by the O-2-TPD and NO oxidation tests. The process of NO oxidation to NO2 plays a key role to produce the absorbed monodentate nitrate as indicated by the In-situ DRIFTS. The support CePO4 acts as the acid sites to form highly active NH4+ species. The synergic effect between the MnOx and CePO4 contributed to the high SCR activity over the MnOx/CePO4 catalyst. Additionally, the MOx/CePO4 catalyst exhibits an excellent water tolerance and N-2 selectivity. Consequently, the MnOx/CePO4 catalyst becomes the potential catalyst for the practical process.
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