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

Abstract

Fe-MIL-101-NH2 was prepared by solvothermal method with ferric nitrate and 2-Aminoterephthalic Acid (DBC-NH2), and Fe-MIL-101-NH2 as precursor was calcined to prepare α-Fe2O3 catalyst. The optimum synthesis condition and the NO conversion efficiency of α-Fe2O3 were systematically investigated, and its crystallinity, micro-morphology and surface acidity were characterized. The results showed that α-Fe2O3 over calcination at 400 °C for 1 h had excellent catalytic activity, SO2 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-Fe2O3 remained above 90 %. The crystal structure of the catalyst was α-Fe2O3 which retained the original octahedral morphology of Fe-MIL-101-NH2 and increased a lot of new pores, leading to more abundant Lewis acid sites for promoting NO conversion efficiency.