Abatement of mixed volatile organic compounds in a catalytic hybrid surface/packed-bed discharge plasma reactor

doi:10.1007/s11783-018-1017-z

Front. Environ. Sci. Eng.

2018, Vol. 12

Issue (2) : 15 https://doi.org/10.1007/s11783-018-1017-z

RESEARCH ARTICLE

Abatement of mixed volatile organic compounds in a catalytic hybrid surface/packed-bed discharge plasma reactor

Lianjie Guo^1,³, Nan Jiang^1,^2,³, Jie Li^1,^2,³(

), Kefeng Shang^1,^2,³, Na Lu^1,^2,³, Yan Wu^1,^2,³

¹. Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), Dalian University of Technology, Dalian 116024, China
². School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
³. School of Environmental Science & Technology, Dalian University of Technology, Dalian 116024, China

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Abstract

• Mixed VOCs were successfully degraded by HSPBD reactor with Ag-Ce/γ-Al₂O₃ catalyst at room temperature.

• The removal performance of single-component and mixed VOCs were compared in both NTP and PPC processes.

• The single-component and mixed VOCs decomposition products after plasma-catalysis treatment were analyzed.

• There existed an optimal gas humid to achieve the highest mixed VOCs removal efficiency.

In this study, post plasma-catalysis degradation of mixed volatile organic compounds (benzene, toluene, and xylene) has been performed in a hybrid surface/packed-bed discharge plasma reactor with Ag-Ce/ g-Al₂O₃ catalyst at room temperature. The effect of relative air humidity on mixed VOCs degradation has also been investigated in both plasma-only and PPC systems. In comparison to the plasma-only system, a significant improvement can be observed in the degradation performance of mixed VOCs in PPC system with Ag-Ce/ g-Al₂O₃ catalyst. In PPC system, 68% benzene, 89% toluene, and 94% xylene were degraded at 800 J·L^-¹, respectively, which were 25%, 11%, and 9% higher than those in plasma-only system. This result can be attributed to the high catalytic activity of Ag-Ce/ g-Al₂O₃ catalyst to effectively decompose O₃ and lead to generating more reactive species which are capable of destructing the VOCs molecules completely. Moreover, the presence of Ag-Ce/ g-Al₂O₃ catalyst in plasma significantly decreased the emission of discharge byproducts (NO_x and O₃) and promoted the mineralization of mixed VOCs towards CO₂. Adding a small amount of water vapor into PPC system enhanced the degradation efficiencies of mixed VOCs, however, further increasing water vapor had a negative impact on the degradation efficiencies, which was primarily attributed to the quenching of energetic electrons by water vapor in plasma and the competitive adsorption of water vapor on the catalyst surface. Meanwhile, the catalysts before and after discharge were characterized by the Brunauer-Emment-Teller and X-ray photoelectron spectroscopy.

Keywords Mixed VOCs HSPBD plasma reactor Degradation Catalyst Relative humidity

Corresponding Author(s): Jie Li

Issue Date: 23 January 2018

Cite this article:

Lianjie Guo,Nan Jiang,Jie Li, et al. Abatement of mixed volatile organic compounds in a catalytic hybrid surface/packed-bed discharge plasma reactor[J]. Front. Environ. Sci. Eng., 2018, 12(2): 15.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-018-1017-z
https://academic.hep.com.cn/fese/EN/Y2018/V12/I2/15

Fig.1 Schematic diagram of the experimental setup

Fig.2 Discharge voltage and current waveforms, gap current (i_g) and displacement current (i_d) of (a) the positive pulse and (b) the negative pulse

Tab.1 Physicochemical characteristics of the support and catalysts

Fig.3 XPS spectra of Ag /γ-Al₂O₃, Ce/γ-Al₂O₃, Ag-Ce/γ-Al₂O₃ and Ag-Ce/γ-Al₂O₃ (afer discharging 2 h) (a) Ag 3d (b) Ce 3d

Tab.2 Surface Ce element states of different catalysts

Fig.4 The degradation efficiencies of single-component VOCs and mixed VOCs in NTP and PPC processes

Fig.5 The variation of the concentration of mixed VOCs with/without catalyst

Fig.6 Energy yield concerning single-component and mixed VOCs as a function of SIE in NTP and PPC systems

Fig.7 FTIR spectra of gaseous products in hybrid surface/packed-bed discharge plasma reactor

Fig.8 CO₂ selectivities as a function of the SIE in NTP and PPC processes

Fig.9 NO₂ concentration as a function of the SIE in NTP and PPC processes

Fig.10 Effects of the relative humidity on degradation efficiencies and O₃ concentration of mixed VOCs in NTP and PPC processes at 23 kV

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