Degradation of benzene, toluene, xylene with high GHSV by double dielectric barrier discharge combined with Mn3O4/activated carbon fibers

2021 ◽  
Author(s):  
Xin Liu ◽  
Jianqi Liu ◽  
Jia-yao Chen ◽  
Fangchuan Zhong
Keyword(s):  
Activated Carbon ◽  
Dielectric Barrier Discharge ◽  
Oxygen Content ◽  
Carbon Fibers ◽  
Barrier Discharge ◽  
Catalytic Performance ◽  
Activated Carbon Fibers ◽  
Dielectric Barrier ◽  
Benzene Toluene ◽  
By Products

Abstract A novel strategy for degradation of high gaseous hourly space velocity (GHSV) benzene, toluene, xylene (BTX) by double dielectric barrier discharge (DDBD) coupled with Mn3O4/ activated carbon fibers (ACF) catalysts was proposed in this work. A series of Mn3O4/ACF catalysts were synthesized by hydrothermal method and characterized. The results showed that all the prepared catalysts could improve the degradation of BTX in DDBD system and inhibit the production of ozone. Among the catalysts with different Mn loading, the 5.6%Mn3O4/ACF, with the highest Mn(+3) content (43.2%) and the highest absorbed oxygen content (38.5%), presented the best catalytic performance. In 5.6%Mn3O4/ACF+DDBD system, the degradation efficiency of benzene, toluene and xylene could reach 49.9%, 79.7% and 97.1% respectively with SIE of 400 J L-1. The carbon balance and CO2 selectivity, meanwhile, were 83.3% and 51.1%, respectively. It seemed that Mn(+3) and absorbed oxygen content could be a reference for the catalytic performance of Mn3O4/ACF catalysts. The higher the Mn (Ⅲ) and absorbed oxygen, the better the catalytic performance of the Mn3O4/ACF catalysts. The organic by-products were identified by chromatography-mass spectrometry (GC-MS), and a possible reaction mechanism of BTX in DDBD reactor and catalyst surface was proposed based on the composition of organic by-products.

scholarly journals Enhanced Photo-Catalytic Performance of Activated Carbon Fibers for Water Treatment

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1794 ◽  
Author(s):  
Konstantinos V. Plakas ◽  
Athina Taxintari ◽  
Anastasios J. Karabelas
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Treatment Time ◽  
Catalytic Performance ◽  
Dip Coating ◽  
Activated Carbon Fiber ◽  
Activated Carbon Fibers ◽  
Tio2 Sample ◽  
Phenol Adsorption ◽  
Electrophoretic Coating

The synthesis, characterization, and performance of composite photocatalytic adsorbents are investigated in this work using the dip-coating and the electrophoretic coating methods for the deposition of titanium dioxide (TiO2) on porous activated carbon fiber (ACF) substrates. The adsorption and photocatalytic efficiency of the synthesized catalytic adsorbents were compared using phenol as the model pollutant. Both immobilization techniques resulted in composite ACF/TiO2 adsorbents characterized by large surface area (844.67 ± 45.58 m2 g−1), uniform distribution of TiO2 nanoparticles on the activated carbon fibers, and high phenol adsorption. The method and the treatment time affected the phenol adsorption, while the highest sorption was determined in the case of the ACF/TiO2 sample prepared by the electrophoretic coating method (at 20 V) for an electrolysis time of 120 s (7.93 mgphenol g−1ACF/TiO2). The UV-A irradiation of most ACF/TiO2 samples led to a faster removal of phenol from water as a result of the combined sorption and heterogeneous photocatalysis. The stability and the effective regeneration of the most promising composite photocatalytic adsorbent was proved by multiple filtration and UV-A irradiation cycles.

scholarly journals Abatement of Toluene by Reverse-Flow Nonthermal Plasma Reactor Coupled with Catalyst

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 511 ◽  
Author(s):  
Wenjun Liang ◽  
Huipin Sun ◽  
Xiujuan Shi ◽  
Yuxue Zhu
Keyword(s):  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Reverse Flow ◽  
Plasma Reactor ◽  
Nonthermal Plasma ◽  
Toluene Degradation ◽  
Dielectric Barrier ◽  
Reactor Temperature ◽  
Dbd Reactor ◽  
By Products

In order to make full use of the heat in nonthermal plasma systems and decrease the generation of by-products, a reverse-flow nonthermal plasma reactor coupled with catalyst was used for the abatement of toluene. In this study, the toluene degradation performance of different reactors was compared under the same conditions. The mechanism of toluene abatement by nonthermal plasma coupled with catalyst was explored, combined with the generation of ozone (O3), NO2, and organic by-products during the reaction process. It was found that a long reverse cycle time of the reactor and a short residence time of toluene decreased the internal reactor temperature, which was not beneficial for the degradation of toluene. Compared with the dielectric barrier discharge (DBD) reactor, toluene degradation efficiency in the double dielectric barrier discharge (DDBD) reactor was improved at the same discharge energy level, but the concentrations of NO2 and O3 in the effluent were relatively high; this was improved after the introduction of a catalyst. In the reverse-flow nonthermal plasma reactor coupled with catalyst, the CO2 selectivity was the highest, while the selectivity and amount of NO2 was the lowest and aromatics, acids, and ketones were the main gaseous organic by-products in the effluent. The reverse-flow DBD-catalyst reactor was successful in decreasing organic by-products, while the types of organic by-products in the DDBD reactor were much more than those in the DBD reactor.

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