1. Catalytic activity of porous manganese oxides for benzene oxidation improved via citric acid solution combustion synthesis.
- Author
-
Guo H, Zhang Z, Jiang Z, Chen M, Einaga H, and Shangguan W
- Subjects
- Citric Acid, Oxides, Porosity, Benzene, Manganese
- 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 MnOx , 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 T90 (the temperature when 90% of benzene was catalytically oxidized) of 212℃. Further investigation showed that C2M1 was Mn2 O3 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 CO2 and H2 O., Competing Interests: Declaration of competing interest We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted., (Copyright © 2020. Published by Elsevier B.V.)- Published
- 2020
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