Catalytic Oxidation of Nitric Oxide over Mn–Fe Metal Oxides Catalysts

概要

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A series of manganese–ferrum oxides (Mn–Fe) catalysts were prepared by organic solvent method and tested for low temperature catalytic oxidation of nitric oxide (NO). The effects of doping of PEG1000 and Fe were studied. These catalysts were characterized by X-ray diffraction (XRD) Brunauer-Emmett-teller measurements (BET) and scanning electron microscope (SEM) methods. Screening and optimization of catalysts formulation and preparation conditions could be achieved by the orthogonal tests, and the influencing law was analyzed. In this method, effects of (Mn7++Mn2+) : Fe3+, Mn7+ : Mn2+, PEG1000/(Mn7++Mn2++Fe3+), agitation temperature and calcination temperature were investigated. The experimental results showed that the best catalyst yielded 91% NO conversion at 100°C (volume fraction of NO was 500 ppm, O2 was 3%, space velocity was 45,000 h−1), and the most active catalyst was obtained with a molar PEG/(Mn7++Mn2++Fe3+) ratio of 1.0%. Orthogonal tests showed that the most obvious effect factor on NO conversion was calcination temperature. The effect order was calcination temperature>PEG1000/(Mn7++Mn2++Fe3+)>Mn7+ : Mn2+>(Mn7++Mn2+) : Fe3+>agitation temperature.
The Society of Chemical Engineers, Japanの論文