Toluene removal by a DBD-type plasma combined with metal oxides catalysts supported by nickel foam

Plasma Reactivity and Plasma-Surface Interactions During Treatment of Toluene by a Dielectric Barrier Discharge

“…On the other hand, Falkenstein [19] found that, at [Tol] 0 = 100 ppm and at room temperature, b decreases from 295 J/L in N 2 down to 195 J/L in N 2 /O 2 with 2% of oxygen (i.e by a factor of 1.5), using a plane-to-plane DBD reactor with an AC excitation. This is the optimum oxygen percentage value mentioned in this work, also obtained by Guo et al [29] for a wire-to-plate DBD and similar other parameters; the removal efficiency decreases when the oxygen percentage increases above 2%. However, Chang and Chang [15] measured continuous increasing removal efficiency when the oxygen percentage increases from 0 up to 21%, at a constant applied voltage of the AC excitation for a cylindrical DBD, at 100°C.…”

“…7 are plotted concentrations of C 2 H 2 , CH 4 , and HCN as functions of the HV-pulse frequency, for 400 ppm of toluene and a temperature of 50°C. These molecules have also been detected in other type of plasma reactors [24,29,54]. Their presence strengthens that toluene is dissociated in the plasma through, at least, two types of reactions: (i) abstraction of the methyl group, (ii) breaking of the benzene ring, as suggested for the first time by Urashima et al [55].…”

“…Since the first work by Yamamoto et al [11], electron beams as well as several types of discharge such as dielectric barrier (DBD) or corona discharges, capillary discharge, DC glow discharge, multi hollow needle discharge, and also various types of packed-bed reactors, have been studied for the treatment of toluene in air [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Some results were published concerning the efficiency of the nitrogen plasma to remove toluene and about the influence of the oxygen percentage added to N 2 [15,19,23,24,29]. It appears that the optimum oxygen content is only 2%, and that the highest removal efficiency achieved in the oxygen free plasma is not negligible as compared to the efficiency in mixtures with oxygen.…”

Toluene decomposition performance and NOx by-product formation during a DBD-catalyst process

“…Notable improvements in inhibition of their formation can be achieved through the plasma-catalysis process, which introduces a catalyst into the discharge zone. Metal oxides have been widely used as active components in the removal of organic compounds (Das and Parida, 2007;Guo et al, 2007;Sano et al, 2006;Karuppiah et al, 2012;Lahousse et al, 1998).…”

Decomposition of benzene by non-thermal plasma processing: Photocatalyst and ozone effect

“…These studies showed that the combination of discharge plasma with catalyst is a very effective method in VOCs removal. (Wallis, 2007;Durme et al, 2007;Magureanu, 2005;Delagrange et al, 2007;Guo et al, 2007). In this paper, the combination of nonthermal plasma was tried with nanometer titanium dioxide (TiO 2 ) photocatalyst for benzene removal, in order to further reduced the energy consumption and harmful byproducts in plasma process.…”