Facile synthesis of porous α-Fe2O3 nanostructures from MIL-100(Fe) via sacrificial templating method, as efficient catalysts for NH3-SCR reaction

Abstract A novel porous α-Fe2O3 nanocatalyst (Fe2O3-2S) was prepared via two-step controlled calcination process using MIL-100(Fe) as both precursor and template. The experimental results showed the preservation of the morphology structure of the original solid. A reference α-Fe2O3 catalyst (Fe2O3-1S) was also developed by one-step calcination, whose original morphology and structure collapsed. The samples were systematically characterized to assess structure, texture, morphology and surface composition, as well as reducibility and surface acidity. The Fe2O3-2S catalyst showed excellent NH3-SCR activity with 100% NOx conversion from 250 to 325 °C and high SO2/H2O duration and stability. The catalytic performance of Fe2O3-2S was explained by the structural, morphological, and chemical properties of the sample, particularly, the high surface area (227 m2/g) and surface oxygen (Oα). In addition, the reducible and acid properties of this sample were superior to those of Fe2O3-1S, which were beneficial for the catalytic performance.