Design Factors for NOx Reduction in Nitrogen Plasma

Abstract

The aim of this paper is to analyze the influence of plasma discharge reactor unit geometries on the efficiency of dry NO x reduction process in nitrogen plasma environments. The experimental setup consists of the versatile plasma discharge reactor unit powered by 10 kHz pulse HV supply and supplied by mass flow controllers with a simulated (NO+N 2 ) gas under different concentrations and flowing rates. The measurements are obtained by the means of a gas analyzer for NO/NO x concentration and a digital oscilloscope supplied with HV and current probes for discharge power computation. The number of surface discharge electrodes, the distance between them, their active area, the gas flow rate and concentration are studied while aiming at 30 g(NO 2 )/kWh energy efficiency and higher reduction efficiencies. These targets are keys to industrial application of plasma discharge reactor, as a way of reducing NO x from the regeneration phase, in the next generation diesel exhaust aftertreatment system and the results proved successful.

High-Efficiency Removal of NOx Using a Combined Adsorption-Discharge Plasma Catalytic Process

“…An improved process for removing low-concentration gas-phase pollutants has been proposed by several groups, − which operates in a cycled system consisted of an adsorption stage and a discharge stage. In the present work, we investigated the removal of NO x on various catalysts through the combined adsorption-discharge process without external heating.…”