Removal of chlorobenzene using a sequential adsorption–plasma catalytic system over Ag‐, Ce‐ and Mn‐modified activated carbon catalysts

Abstract

BACKGROUND A dielectric barrier discharge reactor coupled with a series of activated carbon (AC) catalysts was applied to remove low concentrations of chlorobenzene. The catalysts were prepared via an impregnation method and their adsorption capacity and plasma‐catalytic ability examined in a sequential adsorption–plasma oxidation process. RESULTS Ag/AC had the longest breakthrough time and highest breakthrough capacity among the catalysts studied. At the discharge stage, the Ag/AC catalyst had the highest CO2 yield, chlorobenzene mineralization rate and carbon balance, and the lowest emission of chlorobenzene when compared with the other catalysts under the same conditions. However, the Ag/AC catalyst exhibited the worst reducing ozone generation performance, while the Mn/AC catalyst showed the best ozone decomposition ability. The organic intermediates produced using Ag/AC and Ce/AC were simpler and in lower concentrations than those formed using Mn/AC. The adsorption capacity and catalytic activity of the Ag/AC catalyst showed no obvious decrease after five cycles. Fourier transform infrared and scanning electron microscopy–energy dispersive spectroscopy analyses after the reaction showed that some nitrogen organic intermediates and chlorine substances produced via the degradation of chlorobenzene were adsorbed onto the catalyst surface. CONCLUSIONS Ag/AC exhibited a longer breakthrough time, higher breakthrough capacity, higher CO2 yield, less chlorobenzene emission and better carbon balance when compared with the other catalysts. © 2019 Society of Chemical Industry

Advance in Using Plasma Technology for Modification or Fabrication of Carbon‐Based Materials and Their Applications in Environmental, Material, and Energy Fields

“…Jiang et al. [ 70 ] proposed a combined system of AC supported metals coupled with a NTP plasma to remove chlorobenzene (one type of VOC) from the air. Through the adsorption‐plasma oxidation process, Ag/AC achieved the highest breakthrough capacity with higher CO 2 yields and fewer chlorobenzene emissions compared to untreated AC, Ce/AC, and Mn/AC.…”

The Adsorption of Ozone on the Solid Catalyst Surface and the Catalytic Reaction Mechanism for Organic Components

“…AC, one of the common carbon‐based supports, supported MnO x /SiO 2 composite, Co, Ag, Ce, and Mn or was modified with them to prepare new catalysts, which were used in catalytic ozonation of benzene derivatives [23d–f] . Compared with the catalytic activities of AC modified by Ag, Ce, and Mn (named Ag/AC, Ce/AC, and Mn/AC catalysts) on decomposing chlorobenzene with ozone, Ag/AC had the best catalytic activity, and its adsorption capacity and catalytic activity did not show obvious decrease after five cycles [23f] …”

Excellent oxidation activity of toluene over core–shell structure Mn2O3@MnO2: role of surface lattice oxygen and Mn species

“…In order to solve the problems of pollution caused by VOCs, many control technologies have been proposed, including adsorption, 7 condensation, 8 biodegradation 9 and catalytic oxidation 10‐12 . Among them, catalytic oxidation technology is considered as one of the optimal methods because of the advantages of low reaction temperature, low operation cost, high elimination efficiency and lack of secondary pollution to the environment 13 .…”