Plasma-assisted catalytic oxidation of methane

Plasma-catalytic hybrid reactor: Application to methane removal

“…Before comparing the effect of thermal catalysis, plasmacatalysis, and plasma alone on the CH 4 conversion efficiency, it was evidenced that in the absence of plasma, ␥-Al 2 O 3 does not exhibit any catalytic activity for CH4 conversion at temperature lower than 450 • C. These results are in agreement with the work of Marques et al [28] who reported a very poor ␥-Al 2 O 3 activity at 450 • C (8 and 2% for GHSV = 20 000 and 40 000 h −1 , respectively) in more complex gas mixture representative CHP emissions, typically 150 ppm NO, 8% O 2 , 7% CO 2 , 1000 ppm CH 4 in N 2 as balance.…”

“…On the other hand, in the plasma-catalysis at high temperature, CO was oxidized to CO 2 by the Pd/Al 2 O 3 catalyst. This latter results show that at temperature higher than 300 • C the major effect is the catalytic effect, since the differences in CH 4 abatement are slight between the systems plasma ON and plasma OFF, which is agreement with the studies of Da Costa et al [26] and Marques et al [28].…”

“…NTP has been extensively used for several chemical and catalytic processes and only a few studies were related to the total oxidation of CH 4 . Examples are the treatment of diesel exhaust gases [12][13][14][15][16], abatement of volatile organic compounds [17][18][19][20][21], hydrocarbons reforming processes [22,23], partial oxidation [24,25], and total CH 4 oxidation in natural gas combined heat power [26][27][28].…”

Low temperature CO sensor based on cataluminescence from plasma-assisted catalytic oxidation on Ag doped alkaline-earth nanomaterials

“…[25][26][27] It could give electrons sufficient energy to cause the rupture of molecular bonds, thus enabling conventional high-temperature thermally driven reactions to proceed at low temperature and atmospheric pressure. [28][29][30] For CO oxidation, cold plasma can give enhanced CO conversion on CuO nanowires at a temperature of over 100 C. 31 Combining PAC and CTL, a plasmaassisted CTL method has been recently used for the sensing of hydrocarbons at a temperature of higher than 190 C. 32,33 However, considering the explosion hazards of CO at relatively high temperature, the sensing of CO at low temperature comes to be important.…”

Mass and Energy Spectrometry of Atmospheric Pressure Plasmas

“…For the former, Zhu et al20 showed the performance of 10% Ni/ Al 2 O 3 catalysts to be improved some 3% to 5% by treatment in a DBD in helium and attributed the improvement to the increased dispersion of the catalyst on the supporting structure. For the latter application, Marques et al21 experimented with a cylindrical, quartz‐tube, reactor which combined a DBD plasma in one section and a second region, positioned inside the reactor furnace, in which the catalyst was placed. The DBD was maintained between a tungsten wire of 0.9 mm diameter, and the 12 mm diameter quartz tube which was wound on its outside with a coil of, grounded, brass wire.…”