期刊
ACS CATALYSIS
卷 8, 期 5, 页码 3865-3874出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b00267
关键词
DeNO(x); density functional theory; diffuse reflectance infrared Fourier transform; mesoporous MnO2; selective catalytic reduction
资金
- National Natural Science Foundation of China [51772008]
- Singapore Academic Research Fund [RG121/16, RG11/17, RG114/17]
- Singapore Agency for Science, Technology and Research (A*STAR) AME IRG grant [A1783c0007]
A solvent-free synthetic method was employed for the construction of mesoporous alpha-MnO2 nanosheets. Benefiting from a solid interface reaction, the obtained MnO2 nanosheets with large oxygen vacancies exhibit a high surface area of up to 339 m(2)/g and a mesopore size of 4 nm. The MnO2 nanosheets as a catalyst were applied in NH3-assisted selective catalytic reduction (NH3-SCR) of DeNO(x) at a relatively low temperature range. The conversion efficiency could reach 100% under a gas hourly space velocity (GHSV) of 700000 h(-1) at 100 degrees C. To gain insight into the mechanism about NH3-SCR of nitric oxide on the MnO2 nanosheets, temperature-programmed desorption of NH3, a density functional theory study, and in situ diffuse reflectance infrared Fourier transform spectra were carried out, revealing the cooperative effect of catalytic sites on the reduction of nitric oxide. This work provides a strategy for the facile preparation of porous catalysts in low-temperature DeNO(x).
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