Complete oxidation of low concentration ethanol in aqueous solution with H2O2 on nanosized Mn3O4/SBA-15 catalyst

Yi Fan Han*, Fengxi Chen, Ziyi Zhong, Kanaparthi Ramesh, Luwei Chen, Dou Jian, Wong Wan Ling

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

In the present study, a new heterogeneous Fenton-like system consisting of nano-composite Mn3O4/SBA-15 catalyst and H2O2 has been investigated for the complete oxidation of ethanol (100 ppm) in aqueous solution. Experimental data show that the relative reaction rate for ethanol oxidation can be strongly influenced by several factors, such as reaction temperature, pH value, ratio of catalyst/solution and the concentration of ethanol. A plausible reaction mechanism has been proposed to explain the reaction behavior. The rate for the complete oxidation is supposed to be dependent on the concentration of intermediates (radicals: {radical dot}OH, O2-, and {radical dot}HO2) that are derived from the decomposition of H2O2. In any case, the complete oxidation of ethanol can be improved only under the conditions that (i) the intermediates are stabilized, such as stronger acid solution and high temperatures, or (ii) scavenging those radicals due to the catalyst is reduced, such as less amount of catalyst and high concentration of reactant. Nevertheless, the reactivity of the presented catalyst is still slightly inferior to the conventional homogenous Fenton catalyst, Fe2+-H2O2. A possible reason is that the concentration of intermediates in the latter is might be relatively high.

Original languageEnglish
Pages (from-to)276-281
Number of pages6
JournalChemical Engineering Journal
Volume134
Issue number1-3
DOIs
StatePublished - 1 Nov 2007
Externally publishedYes

Keywords

  • Catalytic oxidation
  • Complete oxidation of ethanol
  • Fenton catalyst
  • Hydrogen peroxide
  • MnO/SBA-15

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