Catalytic activity of porous manganese oxides for benzene oxidation improved via citric acid solution combustion synthesis

Hao Guo, Zhixiang Zhang, Zhi Jiang, Mingxia Chen, Hisahiro Einaga, Wenfeng Shangguan

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Various manganese oxides (MnOx) 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 Mn2O3 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 H2O.

Original languageEnglish
Pages (from-to)196-204
Number of pages9
JournalJournal of Environmental Sciences (China)
Volume98
DOIs
Publication statusPublished - Dec 2020

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Environmental Science(all)

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