Application of Micro Plasma for NOx Removal

Abstract

In this paper, microplasma is investigated, which occurs between the narrow gap of the electrodes covered with dielectric materials. The discharge gap is set on the order of micrometers by changing a spacer from 0 to 100 μm. In this paper, the characteristics of microplasma, such as discharge voltages, discharge currents, and discharge power that is obtained with the help of Lissajous figures, and the relationships between these electric characteristics are presented. The characteristics of ozone generation by a microplasma electrode are investigated. Treatment by microplasma for the simulated exhaust gas, which contains NO x and C 3 H 8 as a role of HC and CO, is estimated experimentally. In the absence of O 2 , the exhaust gas is decomposed by nitrogen atomic species in particular. In the presence of O 2 , it is decomposed by nitrogen atomic species and oxidized by ozone. By-product analysis of treated gases is carried out by Fourier transform infrared spectroscopy and gas chromatography-mass spectrometry. When HC, NO x , and N 2 are included in the simulated exhaust gas, HCN, N 2 O, and CH 4 are confirmed as byproducts of the microplasma treatment.

Study of Sterilization and Disinfection in Room Air by Using Atmospheric Microplasma

“…Corresponding discharge current showed a typical waveform of dielectric barrier discharge. The microplasma reactor can generate atmospheric plasma at about 1 kV, since its discharge gap was narrow (about 10 to 100 μm) [12][13][14][15][16][17].…”

“…Water droplets from the nebulizer were entrained in the nitrogen gas that could generate the other active species in the microplasma discharge [14].…”

“…In this article, a technique for indoor air control by microplasma will be introduced. We investigated the sterilization or disinfection and its sterilization process for the airborne bacteria, and the surface colonized bacteria by using atmospheric microplasma [12][13][14][15][16][17].…”

Augmenting NO x reduction in diesel exhaust by combined plasma/ozone injection technique: a laboratory investigation

“…In the past few years, the electrical discharge approach or the non‐thermal plasma approach has been extensively used for controlling various gaseous pollutants including NO x and total hydrocarbons in actual/simulated diesel exhaust environments [1–10]. Due to the oxidising nature of the plasma, it has become a necessity now to additionally treat the exhaust (which is pre‐treated by plasma) by a catalyst/adsorbent.…”