Decomposition of high-level ozone under high humidity over Mn–Fe catalyst: The influence of iron precursors

Abstract

a b s t r a c t a r t i c l e i n f oManganese-iron mixed oxide, an efficient and stable catalyst, has been successfully used in the decomposition of ozone. The influence of different iron precursors on the catalytic decomposition activity of high-level ozone under high-humidity over manganese-iron catalysts prepared using a hydrothermal approach was studied. The catalytic performance over MnFe 0.5 O x -Fe(NO 3 ) 3 was much better than that of MnFe 0.5 O x -FeSO 4 and MnFe 0.5 O x -FeCl 3 . From the results of characterization by N 2 physical adsorption, XRD, XPS and SEM, it was concluded that the largest specific surface area, the lowest crystallinity, the most evenly distributed particle size and the most surface-active Mn 2+ and Mn 3+ led to the best catalytic activity for the MnFe 0.5 O x -Fe(NO 3 ) 3 catalyst.

Non-Thermal Plasma Combined with Cordierite-Supported Mn and Fe Based Catalysts for the Decomposition of Diethylether

“…This observation suggested a strong interaction between the Mn and Fe species, which likely existed as an amorphous mixed oxide. A similar result was reported by Lian et al for a bimetallic Mn-Fe catalyst prepared by a hydrothermal method [20]. …”

“…This result clearly showed the synergistic effect of Mn and Fe on the decomposition of ozone. The low crystallinity of the Mn-Fe mixed oxide, as observed by XRD, which indicated more defects and possibly an enhanced surface area, is believed to favor the decomposition of ozone [20]. The deactivated Fe/cordierite was then regenerated at 250 °C for 1.0 h in ambient air to continue investigating the catalyst performance toward ozone decomposition in the presence of oxygen plasma.…”

Fe0.5MnO x · nH2O nanolayers synthesized via successive ionic layer deposition and their use in voltammetric nonenzymatic determination of hydrogen peroxide

“…After the treatment of the substrate in the manganese acetate solution and washing its excess, the layer of the adsorbed manganese hydroxide is formed on the surface: (1) During treatment in the potassium ferrate solution, the ferrate anions are involved in the redox reaction with manganese (II) ions adsorbed on the surface, and this reaction leads to the oxidation of Mn(II) to Mn(IV) and reduction of Fe(VI) to Fe (III), which are sparingly soluble and form the layer of double iron and manganese oxide on the surface.…”

“…This feature defines the practical importance of oxides which serve as catalysts in the oxidation of organic compounds and ozone decomposition [1], impulse oxygen sources [2] and one of the reagents in the thermochemical cycle during the production of hydrogen [3]. Other applications of these oxides are as electrodes for supercapacitors [4] and lithium-ionic current sources [5], magnetic materials [6], and sorbents for the removal of arsenites and selenites from aqueous solutions [7,8].…”

“…The mixed iron-manganese oxides can be obtained via sintering [2,3], hydrothermal methods [1,8], ultrasonic treatment of solutions [9], precipitation from solutions [7], microemulsions [10] and at the electrode surface [4], sole-gel technology [6], and other methods.…”