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- Title
Mn–Co binary oxides for low‐temperature catalytic oxidation of NO: effect of SO<sub>2</sub> and regeneration.
- Authors
Tang, Xiaolong; Chen, Du; Chu, Chao; Gao, Fengyu; Yi, Honghong; Wang, Chengzhi
- Abstract
BACKGROUND: In this paper, Mn–Co binary oxides prepared by an (NH4)2CO3‐assisted co‐precipitation method were used for the catalytic oxidation of NO at low temperatures. RESULTS: Experimental results showed that the Mn–Co binary catalysts prepared with manganese acetate and cobalt nitrate exhibited the highest oxidation activity, obtaining a NO conversion of 76% at 200 °C and 80% at 250 °C. The passivation effect of SO2 was found to be irreversible in the examination of the resistance to SO2 or/and H2O(g). Furthermore, characterization by X‐ray Photoelectron Spectroscopy (XPS), Fourier Transform infrared spectroscopy (FTIR), and in situ Diffuse Reflectance Infrared Fourier Transform spectroscopy (DRIFTs) revealed that the passivation effect was due to the bidentate and surface or bulk‐like sulfates generated on the surface of the catalyst. CONCLUSION: The analysis of intermediate species during the in situ DRIFTs characterization revealed that these sulfate species competed with nitrate/nitrite species for adsorption and affected the activity. Moreover, the poisoned catalysts could be regenerated to remove the majority of the bidentate and surface or bulk‐like sulfates from the surface and maintain the excellent NO catalytic oxidation activity. © 2021 Society of Chemical Industry (SCI).
- Subjects
SOCIETY of Chemical Industry (Great Britain); CATALYSTS; CATALYTIC oxidation; FOURIER transform infrared spectroscopy; MANGANESE acetate; X-ray photoelectron spectroscopy; CHEMICAL industry; NITRITES; OXIDES
- Publication
Journal of Chemical Technology & Biotechnology, 2021, Vol 96, Issue 10, p2956
- ISSN
0268-2575
- Publication type
Article
- DOI
10.1002/jctb.6852