Non-oxidative methane coupling using Cu/ZnO/Al2O3 catalyst in DBD

Effect of Coexistent Hydrogen on the Selective Production of Ethane by Dehydrogenative Methane Coupling through Dielectric-Barrier Discharge under Ordinary Pressure at an Ambient Temperature

“…In our previous report [16], the methane conversion is limited to 9.5%, but the main product is ethane (nearly 60%) followed by propane (around 20%). The distributions of these main products by DBD are also similar values to the other reports [9][10][11][12][13][14][15], improving the methane conversion by use of catalysts, although the increase of C 2 selectivities has been limited by ca. 20%.…”

“…Subsequently, intensive investigations on dehydrogenative (nonoxidative) coupling of methane have been conducted in atmospheric nonthermal plasmas generated by spark discharge or dieletric-barrier discharge (DBD) without catalysts [9][10][11] and by DBD with special catalysts [12][13][14][15]. Ethane is the main product of these methane activation techniques, and the selectivity was as much as 60%, accompanying unsaturated and C3+ hydrocarbons.…”

Plasma Catalytic Conversion of CH4 to Alkanes, Olefins and H2 in a Packed Bed DBD Reactor

“…However, the gas-phase plasma reactions occur via a free radical mechanism [2] and may not be efficiently selective to desired products. In a plasma-catalyst hybrid system, reactive plasma species (e.g., radicals) can interact with the catalyst, which can influence the reaction pathways and the selectivity of the desired products [3][4][5][6][7][8][9][10][11][12][13]. The plasma provides the required energy for activation of the stable molecule by breaking the bond (e.g., C-H for methane activation) and generates a pool of radicals, which can react with the catalyst, as the medium that is capable of conducting the interaction among radicals, selectively shifting reaction pathways towards more value-added products.…”

“…The introduction of a packing material inside the plasma discharges can shift the distribution of products. Several catalyst-supports, such as alumina, silica and titania [7,14,15], with or without metals, such as Pt, Ni, Cu and Ru, were utilized for conversion of methane via a non-oxidative route in combination with dielectric barrier discharge (DBD) plasma reactors [8,10,[16][17][18]. Previous studies focused on the investigation of methane activation to higher hydrocarbons, where the separate role of metal and catalyst support and their synergy with DBD plasma was not fully clarified [17].…”

Conversion of Methane to C2Hydrocarbons and Hydrogen Using a Gliding Arc Reactor

“…This characteristic makes it suited to chemical synthesis selection [12] . For CH 4 conversion, various plasma generation methods are used, such as glow discharge [15,16] , dielectric barrier discharge (DBD) [13,17,18] , corona discharge [19,20] , radio frequency discharge (RF) [21∼23] , gliding arc discharge [10∼12,14] , and thermal plasma [24,25] . Table 1 shows the general comparison between nonthermal and thermal plasma in terms of some nonphysical factors.…”