Gas-Phase Pollutant Decomposition with Non-Thermal Plasmas: Simple Removal Equations and Figures-of Merit
LOS ALAMOS NATIONAL LAB NM
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Non-thermal plasmas NTPs are a type of advanced oxidation and reduction technology for treating gas-phase chemical pollutants. Such plasmas are good sources of highly reactive oxidative and reductive species free radicals and others, e.g., OP3, OH, N, H, NH, CH, O3, O2 delta-1, and plasma electrons. Because radical-attack reaction rate constants are very large for many chemical species, entrained pollutants are readily decomposed by NTPs. Via these reactive species, one can direct electrical energy into favorable gas chemistry through energetic electrons, rather than using the energy to heat the gas. NTPs are commonly created by an electrical discharge in a gas or the injection of an energetic electron beam into a gas. Both methods create secondary plasma electrons, with a distribution of electron energies defined by an average electron energy or electron temperature. In NTPs, the electrons are highly energetic hot and the ions and background gas species are at near-ambient temperature cold. For this reason, these plasmas are sometimes called cold plasmas.
- Physical Chemistry
- Plasma Physics and Magnetohydrodynamics