Hydroxyl Radicals Formation in Dielectric Barrier Discharge During Decomposition of Toluene

Abstract

A method based on high performance liquid chromatography (HPLC), has been developed to measure hydroxyl radical ( Á OH) in plasma reactors. The determination was performed indirectly by detecting the products of the reaction of Á OH with salicylic acid (SAL). The applicability, and effect of time, specific input energy (SIE), relative humidity (RH), catalyst were investigated. It was found that 3 h was the optimal trapping time; concentration of Á OH was (5.9-23.6) 9 10 13 radicals/cm 3 at SIE range. The highest Á OH yield and toluene removal efficiency (g) were achieved with a RH of 20%. With MnO x , g was two times that without catalyst, while Á OH yield in gas stream was one-sixth that without catalyst. However, if summed with Á OH adsorbed on catalyst surface, the total Á OH yield was the same as without catalyst. Experiments performed with/without toluene allowed to determine the role of Á OH on decomposition of toluene in air plasma.

Non-thermal plasma abatement of trichloroethylene with DC corona discharges

“…Guo et al determined the concentration of OH radicals during the decomposition of toluene in air with a dielectric barrier discharge operated at atmospheric pressure and with varying RH. The highest toluene RE was achieved at a RH of 20% which corresponded with the maximum OH yield [21]. Although higher RH were not examined in this study, the RE reached a maximum value at RH of almost 20%.…”

CO2 dissociation in a packed bed DBD reactor: First steps towards a better understanding of plasma catalysis

“…The most important element that is limiting this understanding and further progress is the fact that no distinction can be made between the chemical and physical effects that may cause the synergy between plasma and catalyst. Most works combine a plasma with a commercial catalyst, being a catalytic active element deposited on a support and sometimes also containing binders and promoters [31,[37][38][39][40][41][42]51,[54][55][56][57][58][59][60][61][62].…”

Coupling of CH4 to C2 Hydrocarbons in a Packed Bed DBD Plasma Reactor: The Effect of Dielectric Constant and Porosity of the Packing

“…As a consequence, the catalyst shows a different performance when used as the packing in a plasma reactor to its performance in a conventional thermal catalytic reactor. Several studies have investigated these mutual effects of plasma and catalyst on each other and their synergy for different applications such as methane reforming, CO 2 conversion, and the removal of volatile organic compounds (i.e., VOCs like toluene) [2][3][4][5][6][7][8][9][10]. According to the existing literature, different parameters such as dielectric constant, surface area, porosity, packing density, and the shape of the packing are considered as the parameters that effectively change the conversion and the yield of products [11][12][13][14][15][16][17].…”