Catalytic Conversions of Polychlorinated Benzenes and Dioxins with Low-chlorine Using V2O5/TiO2

Abstract

Chlorinated benzene, especially 1,2-dichlorobenzene (1,2-DCB), has been widely used as one of surrogate compounds of dioxin to find the noble methods to control dioxin. However, the relationship between the catalytic activity of dioxin surrogate compound and dioxin has not been understood quite well. In this work, we used a vanadium based catalyst (V 2 O 5 /TiO 2 ) to compare catalytic activity of chlorinated benzenes and dibenzo-p-dioxins with low-chlorine content using the lab-scale system. We investigated the catalytic conversions of low-chlorinated dioxins, [2-monochlorodibenzo-p-dioxin (2-MCDD), 2,3-dichlorodibenzo-p-dioxin (2,3-DCDD)] and polychlorinated benzenes [1,2-DCB, 1,2,3,4-tetrachlorobenzene (1,2,3,4-TeCB), pentachlorobenzene (PeCB), hexachlorobenzene (HCB)] using a V 2 O 5 /TiO 2 catalyst to understand quantitative relationship between dioxin and benzene with the chlorination level. The catalytic decomposition of chlorinated aromatic compounds was following 1,2-DCB > 1,2,3,4-TeCB > 2-MCDD > PeCB ≥ 2,3-DCDD > HCB. It might be more reasonable that PeCB or HCB should be used as the dioxin surrogate compound rather than 1,2-DCB. Also, we investigated the effect of both O 2 content and space velocity (SV) on the catalytic decomposition of 1,2-DCB in the presence of V 2 O 5 /TiO 2 catalyst because these factors should be considered significantly in combustion facilities to control various pollutants. The decomposition of 1,2-DCB shows dependency on the SV while the effect of oxygen content on the catalytic decomposition is negligible in the range of 5-20%.

Dissociative adsorption of 2,3,7,8-TCDD on the surfaces of typical metal oxides: a first-principles density functional theory study

“…In the previous experimental research studies, PCDD/Fs are often replaced by model compounds, such as chlorobenzenes 4,9,15 and chlorophenols, 16,17 which are less toxic and more convenient for detection. However, as reported in several studies, [18][19][20] the catalytic performance and mechanism for these model compounds may not be consistent with those for PCDD/Fs due to the significant differences between their chemical structures. Furthermore, some important intermediates that formed during the process of the reactions might be too transient to be discernible by the experimental studies.…”

Ball Milling Synthesized MnOx as Highly Active Catalyst for Gaseous POPs Removal: Significance of Mechanochemically Induced Oxygen Vacancies

“…Since HCBz is a perfect surrogate of PCDD/Fs, PCBs, and PeCBz in catalytic destruction reaction, , BM synthesized MnO x with excellent HCBz removal performance is potentially effective for the destruction of other POPs. More over, the facile scalable catalyst production facilitates the construction of catalyst module.…”

Regenerable magnetic octahedral layer catalyst for gaseous UPOPs removal

“…S3). HCBz was adopted as a surrogate of UPOPs [37]. It can be observed that the fabrication of Fe 3 O 4 on OL lowered the catalytic activity, probably due to the partially coverage of reactive surface.…”