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N Atom Radicals and N2(A3∑u+) Found To Be Responsible for Nitrogen Oxides Conversion in Nonthermal Nitrogen Plasma

“…Application of short-duration high-voltage pulses to a wire-cylinder reactor producing nonthermal plasma induced by highly nonhomogeneous electric fields (corona discharge processes) has been extensively investigated − and used for conversion of nitrogen oxides (NO x ). − When the wire electrode is positively charged, induced plasma channels (positive streamers) propagate from the wire anode to the cylinder cathode, and the discharge pulse itself is then called a positive corona discharge. The energetic electrons in the streamer can excite molecular nitrogen and produce many kinds of chemically active species, including metastable excited states (like N 2 (A 3 ∑ u + )), radicals (like N atoms), and cations (like N 2 + ), depending on the electron energy.…”

Energy Consumption and Optimal Reactor Configuration for Nonthermal Plasma Conversion of N2O in Nitrogen and N2O in Argon

“…For example, ammonia, calcium hydroxide, and hydrated lime have been tested as additives to the flue gas by Dinelli et al The test results have confirmed the physical feasibility of the process. Chung et al have found that electrical energy consumption per converted NO molecule has a minimum value of 17 eV when pentanol is injected. When ethylene and propylene are injected, 30 and 22 eV of electrical energy are required for the conversion of a NO molecule.…”

“…(2) The second category of approaches to reducing energy consumption is optimization of the electrical circuit for efficient energy transfer to the reactor, which refers to the efficiency of converting wall plug electrical power into power deposited by electrons into the plasma reactor. Chung et al demonstrated that the ratio of the pulse-forming capacitance to reactor capacitance plays an important role in the energy-transfer efficiency to the reactor. However, we note that the capacitance of the reactor varies with the development of corona discharges.…”

“…Mok et al, on the other hand, found that, when the pulse-forming capacitance was 5 times larger than the geometric capacitance of the reactor, the energy utilization efficiency was maximized. Recently, Chung et al reported that the maximum energy-transfer efficiency could be obtained when the pulse-forming capacitance is 3.4 times larger than the reactor capacitance. Korzekwa et al performed an energy balance analysis on the pulsed-corona-discharge system using a hydrogen-filled spark gap switch.…”