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Catalytic activity of porous manganese oxides for benzene oxidation improved via citric acid solution combustion synthesis.
- Source :
-
Journal of Environmental Sciences (Elsevier) . Dec2020, Vol. 98, p196-204. 9p. - Publication Year :
- 2020
-
Abstract
- Various manganese oxides (MnO x) prepared via citric acid solution combustion synthesis were applied for catalytic oxidation of benzene. The results showed the ratios of citric acid/manganese nitrate in synthesizing process positively affected the physicochemical properties of MnO x , e.g., BET (Brunauer-Emmett-Teller) surface area, porous structure, reducibility and so on, which were in close relationship with their catalytic performance. Of all the catalysts, the sample prepared at a citric acid/manganese nitrate ratio of 2:1 (C2M1) displayed the best catalytic activity with T 90 (the temperature when 90% of benzene was catalytically oxidized) of 212℃. Further investigation showed that C2M1 was Mn 2 O 3 with abundant nano-pores, the largest surface area and the proper ratio of surface Mn4+/Mn3+, resulting in preferable low-temperature reducibility and abundant surface active adsorbed oxygen species. The analysis results of the in-situ Fourier transform infrared spectroscopy (in-situ FTIR) revealed that the benzene was successively oxidized to phenolate, o -benzoquinone, small molecules (such as maleates, acetates, and vinyl), and finally transformed to CO 2 and H 2 O. Image, graphical abstract [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10010742
- Volume :
- 98
- Database :
- Academic Search Index
- Journal :
- Journal of Environmental Sciences (Elsevier)
- Publication Type :
- Academic Journal
- Accession number :
- 146535517
- Full Text :
- https://doi.org/10.1016/j.jes.2020.06.008