Highly Efficient Conversion of Methane to Olefins via a Recycle-Plasma-Catalyst Reactor

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

“…CH4 + e -→ CH3 + H + e -(1)  CH3 + CH3 → C2H6 5CH4 + e -→ CH2 +2H + e -(2)  CH2 + CH2 → C2H4 (6) CH4 + e -→ CH + 3H + e -(3)  CH + CH → C2H2 7CH4 + e -→ C + 4H + e -(4)  C + C → C2 (8) Further radical chain reactions occur inside the plasma discharges to form C3 compounds via interactions of primary radicals (e.g., CH3) and secondary radicals (e.g., C2H5) as specified in reactions 9 and 10:…”

“…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.…”

Low energy cost conversion of methane to ethylene in a hybrid plasma-catalytic reactor system

“…Discharge interruptions and catalyst clogging caused by carbon formation are the main reasons of unstable performance. Addition of O2 [32], or use of a sequence of reactors [34,35], a plasma and a catalytic one, have been proposed as solutions at the expense of increasing energy consumption, as the catalytic reactor requires additional energy to reach temperatures suitable for the hydrogenation reaction. From an industrial perspective, reactor cascades would increase the capital investment while pure O2 would be an additional expensive utility.…”

“…They reported 52.1% global C2H4 yield. Working the same way, Wang and Guan [35] optimized this system further by introducing recycle streams and reached 55% global C2H4 yield. In these works, the significantly high energy cost of C2H4 production was the major disadvantage of the process.…”

Microfluidic chips for plasma flow chemistry: application to controlled oxidative processes

“…), ozone gener-ation [7][8][9][10][11][12] , air and water depollution (including volative organic compounds removal) 9,[13][14][15][16] or plasma-assisted combustion 17 . Meanwhile, plasmachemical synthesis has barely ventured beyond (nano-)material synthesis [18][19][20][21][22][23][24] , plasma-assisted polymerization [25][26][27] and a couple of gas-phase reactions (including benzene hydroxylation [28][29][30][31][32] and methane reforming [33][34][35][36][37] ).…”