Catalytic behavior and synergistic effect of nonthermal plasma and CuO/AC catalyst for benzene destruction

Abstract

Nonthermal plasma-catalysis hybrid technology (NTP-C) operated at ambient temperature and pressure offers an innovative and effective approach to solving the problem of dilute volatile organic compounds pollution. Herein, the destruction of benzene (50-450 ppm) over an in-plasma NTP-C composite system was investigated. The AO x /active carbon (AO x /AC), AO x /3A molecular sieve (AO x /MS), and AO x /c-Al 2 O 3 (A = Fe, Ag, Zn, Mn, and Cu) catalysts were prepared by the incipientwetness impregnation method. The destruction performances of NTP alone and NTP-C are compared under different reaction conditions, such as inlet reactant concentration, catalyst type, and energy density. AC exhibits the best benzene removal efficiency among three catalyst supports, and the performances of AO x /AC under different conditions follow the trend ofThe NTP with CuO/AC system exhibits the highest benzene elimination capability with almost 90.6 % inlet benzene removed at energy density of 70 and 270 J L -1 . The strong adsorption ability of AC and the optimal catalytic ability of crystalline structure of CuO on the AC support may be contributed to the excellent performance of CuO/AC. It is found that the NO x by-product also can be well controlled over NTP-CuO/AC system. Additionally, the surface of CuO/AC is more slipperier and homogeneous with the reaction proceeding, indicating higher stability of CuO/AC.

Treatment of hospital indoor air by a hybrid system of combined plasma with photocatalysis: Case of trichloromethane

“…Fig.15presents the variation of RS at various voltages and RH using three processes at a fixed chloroform content obviously, the RS varies from 1.38 to 1.26 for RH when the RH varies from 5 to 90% and RS varies from 1.15 to 1.19 when input voltage varies from 9 to 21 kV, respectively. This synergistic effect is observed under different parameters and are in good agreement with those obtained by several groups[9,11,13,14,38].Figure16 shows that the increase of the relative humidity (90%) induces a decrease of the IBE of CO at each value of voltage injected. This decrease is more pronounced at 21kV: the IBE CO 64% at a RH of 90 %.…”

“…That could be explained by the fact that more electrons and reactive species (such as O • ) were formed and then leads to ozone production (Eqs. 9 and 10) [37,38]. .…”

Abatement of VOCs Using Packed Bed Non-Thermal Plasma Reactors: A Review

“…As shown in Figure 2, the presence of packing materials in the discharge region maximizes the number of micro streamers and thus producing more high energy electrons [18]. These energetic electrons produce reactive intermediates resulting in increased VOC removal efficiency when compared to the unpacked reactors [57,73,74]. Surface discharges produced along the surface of the packing material may distribute the plasma more evenly and intensively throughout the reactor [75] and the catalytic reactions occur on the surface of the packing material.…”

“…This is because porous alumina possess electron-accepting acidic center which acts as an adsorption material for compound with π-electrons [101]. He et al [73] reported that the activated carbon exhibits higher removal efficiency of benzene due to its higher surface area (S BET = 609.3 m 2 /g) when compared to other packing materials such as alumina (S BET = 230 m 2 /g) and molecular sieve (S BET = 45 m 2 /g).…”

Enhanced plasma-catalytic decomposition of toluene over Co–Ce binary metal oxide catalysts with high energy efficiency

“…6,7 Catalysts are identied to play an important role in further advancing the plasma-catalytic performance and energy efficiency of IPC system. 8 Heterogeneous catalysts have been employed for VOC decomposition, e.g., noble metals, 9,10 metal oxides, [11][12][13][14] and their combinations. [15][16][17][18][19][20][21] Among these catalysts, metal oxide catalysts (e.g., CoO x , 11 MnO x , 12 CuO 13 and CeO 2 14 ) attract tremendous interest in consideration of the high catalytic activity, good economics and superior poisoning resistance.…”