期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 16, 页码 14500-14508出版社
AMER CHEMICAL SOC
DOI: 10.1021/am5038164
关键词
nitrogen oxides; selective catalytic reduction; manganese-cerium-titanium mixed oxide; in situ drifts; redox cycle
资金
- National Natural Science Foundation of China [21377010, 21325731]
- Fundamental Research Funds for the Central Universities [YS1401]
- State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex [SCAPC201402]
- Chinese Ministry of Education [NCET-13-0650]
- National Research Foundation of Korea [10Z20130011056] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Mn-Ce-Ti mixed-oxide catalyst prepared by the hydrothermal method was investigated for the selective catalytic reduction (SCR) of NOx with NH3 in the presence of oxygen. It was found that the environmentally benign Mn-Ce-Ti catalyst exhibited excellent NH3-SCR activity and strong resistance against H2O and SO2 with a broad operation temperature window, which is very competitive for the practical application in controlling the NOx emission from diesel engines. On the basis of the catalyst characterization, the dual redox cycles (Mn4+ + Ce3+<-> Mn3+ + Ce4+, Mn4+ + Ti3+ <-> Mn3+ + Ti4+) and the amorphous structure play key roles for the high catalytic deNO(x) performance. Diffuse reflectance infrared Fourier transform spectroscopy studies showed that the synergetic effect between Mn and Ce contributes to the formation of reactive intermediate species, thus promoting the NH3-SCR to proceed.
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