Performance and mechanism of MnOx/γ-Al2O3 for low-temperature NO catalytic oxidation with O3/NO ratio of 0.5

被引:7
作者
Liu, Lijun [1 ]
Shen, Boxiong [1 ,2 ]
Si, Meng [1 ]
Lu, Fengju [1 ]
机构
[1] Hebei Univ Technol, Sch Energy & Environm Engn, Tianjin, Peoples R China
[2] Hebei Univ Technol, Sch Chem Engn, Tianjin, Peoples R China
基金
中国国家自然科学基金;
关键词
NO catalytic oxidation; MnOx/gamma-Al2O3; Ozone; Low temperature; SIMULTANEOUS REMOVAL; MANGANESE OXIDES; SPINEL CATALYST; DEEP OXIDATION; SO2; RESISTANCE; NITRIC-OXIDE; OZONE; REDUCTION; CO; ALUMINA;
D O I
10.1016/j.fuproc.2021.106979
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
In order to further improve the low-temperature oxidation performance of NO in flue gas, various manganese loadings supported on gamma-Al2O3 catalysts were synthesized for NO catalytic oxidation with low O-3/NO ratio of 0.5 at 80-200 degrees C, the key factors effecting NO conversion and the reaction mechanism were also investigated. Characterization results showed that strong redox behavior, high Mn3+ /Mn4+ and abundant chemisorbed oxygen were conducive to catalytic activity, thereby 20%-MnOx/gamma-Al2O3 calcined at 500 degrees C exhibited excellent performance. Meanwhile, there was a clear synergy between 20%-MnOx/gamma-Al2O3 and O-3. NO conversion was significantly higher in O-3 system and catalyst + O-3 system than that in catalyst + O-2 system, meanwhile catalyst + O-3 system exhibited higher NO conversion than O-3 system. Besides, NO conversion could be further improved with lower NO initial concentration, about 10% O-2 content and lower GHSV. Both H2O and SO2 exerted negligible impact on the catalytic activity of 20%-MnOx/gamma-Al2O3, but SO2 inhibited its catalytic activity irreversibly due to the deposition of S-species on the catalyst surface. According to the in-situ DRIFTS analysis, the intermediate by-products and their changes during the NO adsorption were recorded. Furthermore, a possible reaction mechanism of NO catalytic oxidation with O-3 was proposed.
引用
收藏
页数:13
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