Preparation and low temperature denitrification properties of ferric oxide red supported manganese oxide and manganese cerium co-oxide catalyst

Iron oxide red (IOR) is a kind of byproduct from spray pyrolysis treatment process of pickling waste liquid. In this project, manganese oxide and manganese cerium co-oxide were loaded onto the surface of IORto prepare IOR supported manganese oxide (Mn x /IOR) and IOR supported manganese-cerium co-oxide (Mnx-Cey/IOR) catalysts by a simple combustion method. Low temperature NH3-selective catalytic reduction (NH3-SCR) denitrification properties of the synthetic catalysts were studied. XRD , SEM, EDS , TEM, BET, XPS, H 2 -TPR and NH 3 -TPD were used to characterize the physiochemical properties of the catalysts. The results show that during the combustion process for preparing Mnx/IOR catalyst, MnO x , almost all in amorphous phase, can be well distributed on the surface of the IOR carrier. The NO x conversions of Mn x /IOR catalyst gradually increase with the increase of MnO x loading amount within a specific working temperature range (<200 °C). When MnO x loading amount x is 0.43, the NO x conversion is up to 85% at most. The low temperature NH 3 -SCR activity of Mn x /IOR catalyst can be enhanced remarkably by introducing cerium . The NO x conversions of Mn 0.43 -Ce y /IOR catalyst at the operating temperature range (<200 °C) increase steadily with the cerium adding amount increasing. All the Mn 0.43 -Ce y /IOR catalysts show excellent denitrification efficiency (more than 90%) at about 160 °C. Compared with Mn 0.43 /IOR catalyst, Mn 0.43 -Ce 0.1 /IOR shows excellent denitrification performance and application prospect because of its higher manganese valence state, enhanced redox capacity, larger specific surface area, and significantly improved surface acidity and anti-SO 2 poisoning ability.