Why is no2 NOx ratio higher in diesel engines than in gasoline engines?

Why is no2 NOx ratio higher in diesel engines than in gasoline engines?

The reaction rate of NO oxidation can be accelerated by catalysts. Therefore, the NO2/NOx ratios are typically much higher in diesel engines equipped with catalysts or catalytic particulate filters than in engines without aftertreatment.

Is diesel exhaust better than gas exhaust?

Diesel engine exhaust. Diesel engines produce two to ten times more particulate emissions than gasoline engines (without catalytic converter) of comparable power output and two to 40 times more particulate emissions than gasoline engines equipped with a catalytic converter (Table 3).

Does diesel emit more CO2 than gasoline?

Although diesel cars obtain 25 to 35 percent better mileage and emit less carbon dioxide than similar gasoline cars, they can emit 25 to 400 times more mass of particulate black carbon and associated organic matter (“soot”) per kilometer [mile].

Why do diesel engines produce less CO2?

Diesel engines emit less CO2 and greenhouse gases than petrol engines. This happens because of the particular type of fuel and the internal efficiency of the diesel engine. More specifically, the fuel used in diesel engines has a higher compression ratio than petrol and it also performs better than petrol engines.

Where does the nitrogen in the exhaust gases come from?

Nitrogen oxides are present in the composition of exhaust gases in the form of oxide and nitrogen dioxide. They are formed as a result of a reaction between atmospheric nitrogen and oxygen or water vapor at a high pressure (28-35 atm) and a temperature of 540-650°C during each compression in the cylinders.

Does diesel produce carbon dioxide?

Diesel fuel is a mixture of hydrocarbons which—during an ideal combustion process—would produce only carbon dioxide (CO2) and water vapor (H2O). Indeed, diesel exhaust gases are primarily composed of CO2, H2O and the unused portion of engine charge air.

Do diesel engines produce CO2?

Because diesels are more efficient, they do in fact emit less carbon dioxide than gasoline engines. Unlike older diesel engines, the newer ones are equipped with diesel particle filters that trap most of that obnoxious particulate matter. However, the amount of nitrogen oxide emitted from diesels remains a problem.

Do diesel engines emit CO2?

Why do diesel engines have nitrogen in the exhaust?

The Nitrogen comes from the air not the diesel fuel.The combustion flame of a diesel engine is hot enough to cause oxygen and nitrogen to react slightly, thus giving a trace of nitric oxide in the exhaust fumes. They run at higher pressures and temperatures than other engines. Which makes them more thermally efficient.

Why do diesel engines produce more NOx than petrol engines?

A. Diesel engines operate at a higher temperature and pressure than petrol engines. These conditions favour the production of NOx gases. The quantity depends on the volume and duration of the hottest part of the flame. Q. Why are diesel cars more fuel efficient than petrol/gasoline cars?

What are the harmful emissions from a diesel engine?

Emissions from Diesel Engine. Carbon monoxide (CO), hydrocarbons (HC), and aldehydes are generated in the exhaust as the result of incomplete combustion of fuel. A significant portion of exhaust hydrocarbons is also derived from the engine lube oil.

What is the concentration of sulfur in diesel exhaust gas?

Sulfur dioxide (SO 2) is generated from the sulfur present in diesel fuel. The concentration of SO 2 in the exhaust gas depends on the sulfur content of the fuel. Low sulfur fuels of less than 0.05\% sulfur are being introduced for most diesel engine applications throughout the USA and Canada.