Abstract
Treatment with selective catalytic oxidation (SCO) is an effective technology applied recently for conversion of nitrogen oxides pollution control. In order to solve the problems of high cost and difficulties in practical application of SCO catalyst, it was put forward using the solid waste sludge from soybean oil plant as catalyst carrier to prepare denitration catalyst. The sludge was treated by alkaline activation and then MnOx-based sludge was prepared by impregnation. Finally, MnOx-based sludge was calcined in the muffle furnace. The effects of activation and calcination conditions on catalyst activity were investigated. Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the activity of the sludge based denitration catalyst, and the structure and activity of the sludge based denitration catalyst were furtherly confirmed. According to the achieved results, (1) after activated by LiOH with a mass concentration of 15% for 4 hours, the surface of the sludge catalyst has more alkali functional groups, making the denitration of sludge catalyst the best; (2) the MnOx-based catalyst calcined in the muffle furnace with calcination temperature of 450 °C for 4 hours has obvious denitration efficiency.
Highlights
The smaller the carbon to nitrogen atomic ratio (C/N) of the sludge catalyst is, the greater the effect of removing nitrogen oxides is[4]
The activation sludge with a mass concentration of 15% LiOH has the best removal effect on NO
In the reaction time of 2–17 min, the removal rate of NO in sludge activated by LiOH with 15% mass concentration was significantly higher than others
Summary
The smaller the carbon to nitrogen atomic ratio (C/N) of the sludge catalyst is, the greater the effect of removing nitrogen oxides is[4]. The carbon to nitrogen atomic ratio (C/N) of soybean oil sludge and its carbon content are lower than that of municipal sewage sludge. Heavy metal content of more than 50 metals in soybean oil sludge was detected by ICP (Inductive Coupled Plasma Emission Spectrometer)[5]. These metal oxides can improve the catalytic activity of soybean oil sludge catalyst. Soybean Oil sludge is a good choice for the catalyst of SCO to remove nitrogen oxides. This study originally proposed to use soybean oil sludge as the denitration catalyst carrier and carry out the alkaline activation treatment of the sludge and use the impregnation method to prepare the MnOx supported catalyst. It is necessary to analyze the surface physicochemical characteristics of catalyst and investigate the influences of various factors on the removal rate of nitrogen oxides to achieve the optimum conditions for processes
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
