Removal of gas phase low-concentration toluene over Mn, Ag and Ce modified HZSM-5 catalysts by periodical operation of adsorption and non-thermal plasma regeneration

Wang, Wenzheng; Wang, Honglei; Zhu, Tianle; Fan, Xing

doi:10.1016/j.jhazmat.2015.03.013

Cited by 86 publications

(28 citation statements)

References 45 publications

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“…Introducing Ag, Mn and Ce into AC leads to a decrease in S BET , pore volume and pore diameter when compared to pure AC because the small‐diameter pores have been partially blocked. Qin et al and Wang et al both found a similar reduction in S BET of their γ‐Al 2 O 3 and HZSM‐5 catalysts when Ag and Mn were introduced, respectively.…”

Section: Resultsmentioning

confidence: 82%

“…Several researchers have reported that manganese oxide catalysts have an opposite effect on VOC catalytic performance because the adsorption and catalytic oxidization of chlorobenzene maybe occur at the same active sites on the manganese catalyst surface and the adsorbed chlorobenzene affects the mobility of the oxygen species making them less reactive . The introduction of Ag may change the adsorption of chlorobenzene to the Ag sites due to the strong intermolecular forces observed between Ag and chlorobenzene, which releases the active sites for reaction …”

Section: Resultsmentioning

confidence: 99%

“…Manganese oxide (MnO x ) has been paid a significant amount of attention due to its capacity to store oxygen and ability to decompose ozone to generate active oxygen species required for the oxidation of VOCs . Wang et al have reported that Ag/HZSM‐5 exhibits not only a large adsorption capacity for toluene, but also enhanced catalytic performance when compared to Ce/HZSM‐5 and Mn/HZSM‐5 . In addition to the active component in the catalysts, the supporting material plays an important role in increasing the adsorption and catalytic capacity.…”

Section: Introductionmentioning

confidence: 99%

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

Jiang

Cao

Chen

et al. 2019

J of Chemical Tech & Biotech

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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

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Jiang

Cao

Chen

et al. 2019

J of Chemical Tech & Biotech

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“…Wang et al have tested various metal loaded zeolites (Ag/HZSM-5, Mn/HZSM-5, Ce/HZSM-5, Ag-Mn/HZSM-5) to remove low concentration of toluene (C6H5CH3) by intermittent use of adsorption and non-thermal plasma regeneration [43]. In this investigation, a link tooth wheel-cylinder DC plasma reactor is placed upstream of the adsorption/catalyst reactor, which is supported by a glass sieve plate.…”

Section: Sequential Treatment (Adsorption Followed By Ntp Oxidation)mentioning

confidence: 99%

Abatement of VOCs with Alternate Adsorption and Plasma-Assisted Regeneration: A Review

et al. 2015

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Abstract:Energy consumption is an important concern for the removal of volatile organic compounds (VOCs) from waste air with non-thermal plasma (NTP). Although the combination of NTP with heterogeneous catalysis has shown to reduce the formation of unwanted by-products and improve the energy efficiency of the process, further optimization of these hybrid systems is still necessary to evolve to a competitive air purification technology. A newly developed innovative technique, i.e., the cyclic operation of VOC adsorption and NTP-assisted regeneration has attracted growing interest of researchers due to the optimized energy consumption and cost-effectiveness. This paper reviews this new technique for the abatement of VOCs as well as for regeneration of adsorbents. In the first part, a comparison of the energy consumption between sequential and continuous treatment is given. Next, studies dealing with adsorption followed by NTP oxidation are reviewed. Particular attention is paid to the adsorption mechanisms and the regeneration of catalysts with in-plasma and post-plasma processes. Finally, the influence of critical process parameters on the adsorption and regeneration steps is summarized.

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“…Unfortunately, the NTP technology also leads to harmful by-product (such as NOx, CO and ozone) formation and low carbon dioxide selectivity [4][5]. Recently, NTP combining with heterogeneous catalysis oxidation has been developed, which can eliminate toxic pollutants, reduce the formation of undesirable by-products and improve the carbon dioxide selectivity at ambient temperature [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

In situ FT-IR study and evaluation of toluene abatement in different plasma catalytic systems over metal oxides loaded γ-Al2O3

Wang

Chen

et al. 2016

Catalysis Communications

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Removal of gas phase low-concentration toluene over Mn, Ag and Ce modified HZSM-5 catalysts by periodical operation of adsorption and non-thermal plasma regeneration

Cited by 86 publications

References 45 publications

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

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

Abatement of VOCs with Alternate Adsorption and Plasma-Assisted Regeneration: A Review

In situ FT-IR study and evaluation of toluene abatement in different plasma catalytic systems over metal oxides loaded γ-Al2O3

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