1998-10-19

Analysis of Plasma-Catalysis for Diesel NOx Remediation 982429

A dielectric barrier discharge device has been built to test nonthermal plasma discharges for simulated diesel exhaust NOx removal. The device has also been tested with selected catalysts located after the plasma. Emissions are measured by conventional automotive emission analyzers, plus FTIR.
Dielectric barrier discharges without catalyst convert input NO to a mix of NO2, HONO, HNO3, and organic nitrates. At 30 J/l energy deposition, approximately 26% of the input NO is “lost”. Some of the hydrocarbon input is converted to a variety of species, including CO, CO2, aldehydes, and alcohols.
A Cu-ZSM catalyst after the plasma device eliminates the apparent NOx conversion seen with the bare plasma. This indicates that the apparent NOx conversion of the bare plasma is actually conversion to some (unmeasured) species which can be reconverted to NOx by the Cu-ZSM catalyst.
Placing a proprietary catalyst within the plasma results in significant NOx conversion. In this case, 56% of the input NO is not found in measured species after the plasma-catalyst system. Remaining NOx is primarily NO. A Cu-ZSM catalyst after this system does not degrade NOx efficiency.
Chemiluminescent NOx analyzers will measure significantly lower NOx conversion than the true value when formaldehyde is present.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

The Effect of Diesel Sulfur Content and Oxidation Catalysts on Transient Emissions at High Altitude from a 1995 Detroit Diesel Series 50 Urban Bus Engine

961974

View Details

TECHNICAL PAPER

European Programme on Emissions, Fuels and Engine Technologies (EPEFE) - Gasoline Aromatics/E100 Study

961072

View Details

TECHNICAL PAPER

The Effect of Ambient Temperature on Cold Start Urban Traffic Emissions for a Real World SI Car

2004-01-2903

View Details

X