Removal of Carbon Nanoparticle using NO_2 Oxidation Technique

摘要

In diesel engine, generally, the removal of carbon nanoparticles has been based on a filtration system or oxidation reactor with O_2 at high temperatures of above 800 °C. Recently, NO_2 has been found to be a more efficient oxidant than O_2 at lower temperatures in the range of 200~500 °C. Small amounts of NO_2 in the range of a few hundreds of ppm by volume can promote the continuous oxidation of carbon particulates. Thus far, experiments involving diesel PM (particulate matter) oxidation by NO_2 are only practiced as regards the soot deposited on filters or plates. However, in aerosol state, depending on the surrounding temperature and the NO_2 concentration, the carbon nanoparticle removal rate is significantly different. Therefore, the study of nano-sized carbon aerosol oxidation in various gas circumstances is required. In this study, the oxidation characteristics of nano-sized carbon aerosol particles in NO_2 condition are investigated.