Citation: Fawei Lin, Zhihua Wang, Jiaming Shao, Dingkun Yuan, Yong He, Yanqun Zhu, Kefa Cen. Promotional effect of spherical alumina loading with manganese-based bimetallic oxides on nitric-oxide deep oxidation by ozone[J]. Chinese Journal of Catalysis, ;2017, 38(7): 1270-1280. doi: 10.1016/S1872-2067(17)62860-2 shu

Promotional effect of spherical alumina loading with manganese-based bimetallic oxides on nitric-oxide deep oxidation by ozone

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received Date: 14 April 2017
Revised Date: 17 May 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (51422605) and the Provincial Natural Science Foundation of Zhejiang, China (LR16E060001).

Nitric oxide (NO) deep oxidation to dinitrogen pentoxide (N₂O₅) by ozone together with wet scrub-bing has become a promising technology for nitrogen-oxide (NO_x) removal in industrial boilers. Catalysts were introduced to enhance the N₂O₅ formation rate with less ozone injection and leakage. A series of monometallic catalysts (manganese, cobalt, cerium, iron, copper, and chromium) as pre-pared by the sol-gel method were tested. The manganese oxides achieved an almost 80% conver-sion efficiency at an ozone (O₃)/NO molar ratio of 2.0 in 0.12 s. The crystalline structure and porous parameters were determined. The thermodynamic reaction threshold of NO conversion to N₂O₅ is oxidation with an O₃/NO molar ratio of 1.5. Spherical alumina was selected as the support to achieve the threshold, which was believed to improve the catalytic activity by increasing the surface area and the gas-solid contact time. Based on the manganese oxides, cerium, iron, chromium, cop-per, and cobalt were introduced as promoters. Cerium and iron improved the deep-oxidation effi-ciency compared with manganese/spherical alumina, with less than 50 mg/m³ of outlet NO + nitro-gen oxide, and less than 25 mg/m³ of residual ozone at an O₃/NO molar ratio of 1.5. The other three metal oxides inhibited catalytic activity. X-ray diffraction, nitrogen adsorption, hydrogen tempera-ture-programmed reduction, and X-ray photoelectron spectroscopy results indicate that the cata-lytic activity is affected by the synergistic action of NO_x oxidation and ozone decomposition.
- Nitric oxide,
- Deep oxidation,
- Catalyst,
- Ozone,
- Transition metal oxide
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