Methanol oxidation in dry and humid air by dielectric barrier discharge plasma combined with MnO2–CuO based catalysts

Abstract

Presence of humidity in polluted gas streams is a key parameter to give a realistic view of a depollution process efficiency. With this in mind, the elimination of methanol by non thermal plasma in presence of a MnO2-CuO based catalyst and 35 % relative humidity (20°C, atmospheric pressure) was achieved. The reactor allows the treatment of low concentration pollutants (25-200 ppm) at weak residence time (0.36s) in air at atmospheric pressure. Based on conversion rate and CO2 selectivity, a 5 % MnO2/ 5 % CuO/ Al2O3 catalyst was selected within an array of catalysts prepared by different impregnation methods with various metal oxide ratios. The presence of humidity affected methanol conversion, ozone concentration and selectivities to by-products. Beneficial effects of humidity were observed on by-products elimination and CO2 selectivity despite a lower methanol conversion compared to dry air conditions.

Depolymerization of inulin in the highly reactive gas phase of a non thermal plasma at atmospheric pressure

“…Based on previous studies the depolymerization was achieved by reaction with active oxygen (ROS)/nitrogen (RNS) species. The slight increase of the reactor's temperature would lead to the release of water molecules from highly hygroscopic inulin and would enhance the formation of H 2 O 2 …”

MnO2‐Based Materials for Environmental Applications

“…Moreover, other MnO 2 /metal oxides binary heterojunctions used for environmental purification have also been reported by researchers, including CuO/MnO 2 for the catalytic oxidation of acid fuchsin dye, [ 218 ] toluene, [ 219 ] methanol oxidation, [ 220 ] CO [ 221 ] and iopamidol; [ 222 ] MnO 2 /ZnO for the catalytic oxidation of Rhodamine B (RhB) [ 223 ] and tetracycline, [ 224 ] as well as MW absorption; [ 225 ] MnO 2 /Al 2 O 3 for the catalytic oxidation of toluene [ 226 ] and adsorption removal of Pb(II), [ 227 ] etc.…”

Characteristics and mechanism of toluene removal by double dielectric barrier discharge combined with an Fe2O3/TiO2/γ-Al2O3 catalyst

“…12 In order to reduce the yield of by-products in the process of removing low-temperature plasma generated by dielectric barrier discharge to remove VOCs and improve the reaction efficiency, a catalyst is usually used for the cooperative reaction. Studies [13][14][15][16][17][18][19][20] have shown that catalysts can effectively increase the reaction area, improve the removal efficiency of VOCs along with the selectivity of CO 2 , and reduce the formation of by-products. 21…”