Abstract
Ce-V-Ti and Ce-V-Ti/GO catalysts synthesized by the sol-gel method were used for the catalytic combustion of dioxins at a low temperature under simulating sintering flue gas in this paper. The catalytic mechanism of Ce-V-Ti catalysts modified with graphene oxides (GO) at a low temperature was revealed through X-ray diffractometer (XRD), Brunauer–Emmett–Teller (BET), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), H2-temperature-programmed reduction (H2-TPR) and Fourier transform infrared (FTIR). During the tests, chlorobenzene (CB) was used as a model reagent since the dioxins are poisonous. The results showed that introducing GO to Ce-V-Ti catalysts can improve the specific surface area and promote the CB adsorption on the surface of catalysts. Simultaneously, the Ce-V-Ti with 0.7 wt % GO support showed the high activity with the conversion of 60% at 100 °C and 80% at 150 °C. The adsorb ability of catalysts is strengthened by the electron interaction between GO and CB through π-π bond. In the case of Ce-V-Ti catalysts, Ce played a major catalytic role and V acted as a co-catalytic composition. After GO modification, the concentration of Ce3+ and V4+ were enlarged. The synergy between Ce3+ and V3+ played the critical role on the low-temperature performance of catalysts under sintering flue gas.
Highlights
Dioxin can cause a series of environmental problems such as photochemical smog, atmospheric ozone depletion and ground-level ozone generation, which are considered to be extremely hazardous contaminants due to serious carcinogenicity and different discharges from the body [1]
Catalysts are crucial for the catalytic combustion of dioxins at low temperature
During the past few decades there are a number of catalysts developed for dioxin catalytic combustion, most of which can be classified into three types: noble metals [5,6], transition metals [7,8] and zeolites [9,10]
Summary
Dioxin (polychlorinated dibenzofurans and polychlorinated dibenzodioxins) can cause a series of environmental problems such as photochemical smog, atmospheric ozone depletion and ground-level ozone generation, which are considered to be extremely hazardous contaminants due to serious carcinogenicity and different discharges from the body [1] It is mainly generated from a wide range of industrial processes or incineration of municipal and medical wastes. Catalytic combustion of dioxins at low temperature (100–200 ◦ C) attracts considerable attention for energy conservation and emission reduction during the iron ore sintering process. The catalytic combustion of dioxins has not been industrialized, so developing catalysts based on transition metal oxides with high catalytic activity at low temperature is of great significance. The catalytic mechanism was supposed on the results of characterizations
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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.
