Modeling Particle Matter Collection in an Electrostatic Precipitator and Reduction of Nitrogen Dioxide and Nitric Oxide with Plasma Assisted Alumina-Supported Platinum Catalysts Modified with Cerium at Diesel Engine Exhaust

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2025年3月12日

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Araz Balali Oskouei,
Javad Koohsorkhi,
Mehdi Mehrpooya

摘要

In this work, feasibility of using electrostatic precipitator and plasma assisted catalyst with excess oxygen and water vapor at the diesel engine exhaust is analyzed in cold start time, the period after engine start, which catalyst is not hot enough to have its maximum efficiency for reducing particulate matters and nitrogen oxides. For the first time, diesel exhaust submicron particulate matter 0.4 μm tracing with COMSOL 3.5 in high velocities with space charge density specifically was achieved. The optimization criteria for best performance of the electrostatic precipitator was determined and the collection efficiency for particles 1 $\upmu\text{m}$ $μ m$ and 0.4 $\upmu\text{m}$ $μ m$ was at least 90% and near 70% respectively. In the plasma part, catalyst transient temperature, steady-state reduction of nitrogen oxide, and cold star time are investigated with respect to velocities and temperatures. During cold start time with using plasma in presence of 20% oxygen and 5% water vapor, nitrogen dioxide and nitric oxide total reduction efficiency increased 21% and 22% in that order.