Browse Publications Technical Papers 2001-28-0050
2001-11-01

New Catalytic Solutions for Tightening Emission Standards 2001-28-0050

To limit problems created by exhaust gas emissions, governments worldwide are gradually introducing more stringent emission standards. To meet new limits, engines as well as exhaust gas after-treatment systems must be improved. The large population of two-stroke engines is a serious problem in many countries, specially in South East Asia. Two-stroke engines create about hundred times higher hydrocarbon and carbon monoxide emissions compared to that of a modern car. However, with a small efficient converter more than half of the emissions can be eliminated, this being the most economic and effective way of reducing emissions from two-stroke engines. In India emission standards are more stringent for CO than for hydrocarbons as compared to the norms in Taiwan and Europe etc. Therefore, the selectivity of the converter should be different to that of a three-way unit. The lack of oxygen in the exhaust gas of a two-stroke engine limits the reaction rate and, for that reason, reactions with water play an important role. Water-gas shift reaction should be favoured instead of steam reforming reaction. The new, more CO selective washcoat is presented in this paper.

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

Exhaust Emission Based Air-Fuel Ratio Model (I): Literature Reviews and Modelling

961020

View Details

STANDARD

Procedure for the Analysis and Evaluation of Gaseous Emissions from Aircraft Engines

ARP1533C

View Details

TECHNICAL PAPER

Reduction of NOx in a Single Cylinder Diesel Engine Emissions Using Selective Non-Catalytic Reduction (SNCR) with In-Cylinder Injection of Aqueous Urea

2019-24-0144

View Details

X