Study of Catalytic Combustion of Dioxins on Ce-V-Ti Catalysts Modified by Graphene Oxide in Simulating Iron Ore Sintering Flue Gas

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.

Research advances in chlorinated benzene-containing compound oxidation catalyzed by metal oxides: activity-enhanced strategies and reaction-facilitated mechanisms

“…The basic O 2− substance is then attacked to form phenolate, and the synergistic action of Brønsted acid and gas oxygen can greatly promote the production of reactive acetaldehyde and its resonant isomer enol. [57][58][59][60][61][62][63][64][65] The catalytic oxidation process can be described by the following equations.…”

“…125 Effects of supporting materials. The carriers that bind CeO 2 usually include molecular sieves, 120,127 graphenes, 62,134 and layered clay. 135 Literature indicated that the catalytic activity of supported catalysts is affected by the particle size of the active com- ponents.…”

“…The carriers that bind CeO 2 usually include molecular sieves, 120,127 graphenes, 62,134 and layered clay. 135…”

“…Ce–V–Ti/GO (graphene oxide) exhibited superior activity with high SSA, abundant B-acid sites, and strong adsorption capacity ( T 60 = 100 °C, T 80 = 150 °C, GHSV = 30 000 h −1 ). 63 After that, they introduce Ti into the carrier to modify GO, and 90% CB conversion was achieved at 236 °C by Ce–V/Ti–GO with 0.7% GO vector. Here, the interaction between Ce and GO has a significant effect on the low-temperature activity.…”

Effect of Na2CO3, HF, and CO2 Treatment on the Regeneration of Exhausted Activated Carbon Used in Sintering Flue Gas

“…A work by Guo et al reported that the amount of organic pollutant phenol and its derivatives in EAC from coking wastewater can be extracted by the low boiling point organic solvents and the regeneration efficiency is 98.27% . However, the EAC produced in the sintering flue gas purification process contains a variety of high thermal stability pollutants such as sulfate, alkali metal, and dust, − which makes it is difficult to regenerate by traditional technology. Up to now, the regeneration technology of EAC from sintering flue gas has not been systematically studied.…”