Browse Publications Technical Papers 2003-01-1185
2003-03-03

Simultaneous Removal of NOX and Particles from Diesel Engine Exhaust Using Plasma and Oxidative Catalyst 2003-01-1185

In this study, performance of a coaxial -type packed - bed plasma reactor was investigated for simultaneous removal of NOX and diesel exhaust particles (DEP) from diesel exhaust. The plasma reactor was a concentric cylinder with a single layer of catalytic pellets (gamma-alumina or Pt -alumina) set between electrodes. Pulsed square high voltage was used. 6.0 L/min of diesel engine exhaust was used as the test gas, and space velocity was 36,000 hr-1 in this plasma reactor. The pressure drop across the reactor was about 380-540 Pa. Experiment was carried out under rich oxygen gas conditions (13- 15%) and low temperature (423K). The DEP was collected by the catalytic pellets. NO was oxidized to NO2 in the plasma and adsorbed by the catalytic pellets along with DEP. Exposing the catalysts to the pulsed plasma, collected DEP was continuously oxidized to CO2. More than 95% of DEP (including sub-nano size particles) from diesel exhaust was collected and oxidized using plasma and catalyst. At the same time, NOX and hydrocarbon were converted into N2, CO2and H2O. 73% removal rate of NOX was obtained in the test at low energy 43 J/L (44 eV/molecule NO). We found simultaneous removal effect continued for 20-30 minutes after switching off the plasma.

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