Preparation of nanosized Mn3O4/SBA-15 catalyst for complete oxidation of low concentration EtOH in aqueous solution with H2O2

Yi Fan Han*, Fengxi Chen, Kanaparthi Ramesh, Ziyi Zhong, Effendi Widjaja, Luwei Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

A new heterogeneous Fenton-like system consisting of nano-composite Mn3O4/SBA-15 catalyst has been developed for the complete oxidation of low concentration ethanol (100 ppm) by H2O2 in aqueous solution. A novel preparation method has been developed to synthesize nanoparticles of Mn3O4 by thermolysis of manganese (II) acetylacetonate on SBA-15. Mn3O4/SBA-15 was characterized by various techniques like TEM, XRD, Raman spectroscopy and N2 adsorption isotherms. TEM images demonstrate that Mn3O4 nanocrystals located mainly inside the SBA-15 pores. The reaction rate for ethanol oxidation can be strongly affected by several factors, including reaction temperature, pH value, catalyst/solution ratio and concentration of ethanol. A plausible reaction mechanism has been proposed in order to explain the kinetic data. The rate for the reaction is supposed to associate with the concentration of intermediates (radicals: {radical dot}OH, O2- and {radical dot}HO2) that are derived from the decomposition of H2O2 during reaction. The complete oxidation of ethanol can be remarkably improved only under the circumstances: (i) the intermediates are stabilized, such as stronger acidic conditions and high temperature or (ii) scavenging those radicals is reduced, such as less amount of catalyst and high concentration of reactant. Nevertheless, the reactivity of the presented catalytic system is still lower comparing to the conventional homogenous Fenton process, Fe2+/H2O2. A possible reason is that the concentration of intermediates in the latter is relatively high.

Original languageEnglish
Pages (from-to)227-234
Number of pages8
JournalApplied Catalysis B: Environmental
Volume76
Issue number3-4
DOIs
StatePublished - 15 Nov 2007
Externally publishedYes

Keywords

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

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