Metal-organic framework assisted preparation of α-Fe2O3 for selective catalytic reduction of NOX with NH3

Fe-MIL-101-NH 2 was prepared by solvothermal method with ferric nitrate and 2-Aminoterephthalic Acid (DBC-NH 2 ), and Fe-MIL-101-NH 2 as precursor was calcined to prepare α-Fe 2 O 3 catalyst. The optimum synthesis condition and the NO conversion efficiency of α-Fe 2 O 3 were systematically investigated, and its crystallinity, micro-morphology and surface acidity were characterized. The results showed that α-Fe 2 O 3 over calcination at 400 °C for 1 h had excellent catalytic activity, SO 2 tolerance, water resistance, and stability. When an initial NO concentration of 500 ppm, the gas hourly space velocity (GHSV) of 35000 h −1 , and a reaction temperature of 350 °C, the NO conversion efficiency of α-Fe 2 O 3 remained above 90 %. The crystal structure of the catalyst was α-Fe 2 O 3 which retained the original octahedral morphology of Fe-MIL-101-NH 2 and increased a lot of new pores, leading to more abundant Lewis acid sites for promoting NO conversion efficiency.