Preparation of soybean oil factory sludge catalyst and its application in selective catalytic oxidation denitration process

摘要

SCO (selective catalytic oxidation) was a new denitration process, and it was used in low temperature environment and in this study. The soybean oil factory sludge (named SOFS) was a solid waste, but preparing it as a denitration catalyst can reduce environmental pollution. SOFS was activated by using equal volume of solution, and it was activated by strong acids (HCl, HNO3, HClO4), strong alkalis (LiOH, NaOH, KOH), different concentrations (5%, 10%, 15%, 20%) and different activation time (2 h, 3 h, 4 h, 5 h). And then muffle furnace roasting and plasma roasting methods were selected to prepare MnO/SOFS catalyst with incipient impregnation. The catalyst was characterized by Fourier Transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM). The experimental results showed that: (1) The optimum activation conditions for denitration catalyst were obtained, LiOH had the best activation effect, its concentration was 15%, and its activation time was 4 h; compared with the original SOFS, the denitration rate increased from 78% to 90%. (2) MnO/SOFS catalyst roasted by the plasma had the best denitration effect, its denitration rate reached 98%, and the conditions of the plasma were O-2 flow rate of 800 ml/min, calcination power of 60 W and calcination time of 30 min. (C) 2019 Published by Elsevier Ltd.