Study on denitration performance of mineral catalyst prepared by high energy ball milling of rare earth concentrate supported Fe2O3 for NH3-SCR

Abstract

A series of mineral catalysts were prepared by soaking in ferric nitrate solution (0 mol/L, 0.1 mol/L, 0.5 mol/L, 1.0 mol/L), high-energy ball milling and microwave roasting. The denitration performance of the mineral catalyst NH3-SCR prepared by high-energy ball milling of Fe2O3 supported on rare earth concentrate was studied. XRD, SEM, EDS, NH3-TPD, H2-TPR, XPS and other means were used to characterize the mineral phase structure, surface morphology, adsorption capacity, reduction performance and surface elements of the catalyst. meanwhile, the denitration activity of the samples was evaluated and compared in the reactor of catalyst evaluation system. The results show that under the experimental conditions of ferric nitrate solution 0.5 mol/L, high-energy ball milling for 120min, ball-to-material ratio 3:1, ball milling speed 1200r/min, microwave roasting in air for 20min, and optimum reaction temperature 350 °C, the NO removal rate can reach 92%. In this paper, the key basic problems of preparing mineral catalysts by high-energy ball milling with rare earth concentrate supported Fe2O3 are revealed, which is a beneficial exploration for high-value utilization of rare earth concentrate resources.