Transcript JAMA position on importance of sulphur reduction in gasoline and

JAMA’s Position on Sulfur Reduction
Jan. 10, 2003
Japan Automobile Manufactures Association
JAMA’s Stance
•JAMA strongly supports this activity to achieve clean air
through improving fuel quality.
•Improving fuel quality is essential in order to introduce lower
emission vehicles equipped advanced after treatment
technology such as 3WAY catalyst and CRDPF, and EGR
system etc.
•Especially, eliminating lead from gasoline and lowering sulfur
in gasoline and diesel fuel are the most important issue.
•Ash forming octane booster should not be allowed.
Sulfur impact on Emissions
SULEV
100
LEV1-LEV
LEV1-LEV
LEV2 ULEV
SULEV
50
LEV,ULEV
0
-50
0
100 200 300 400 500 600
Sulfur (ppmw)
(based on 30/40ppm sulfur)
150
Relative NOx
(based on 30/40ppm sulfur)
Relative THC
Lowering sulfur in gasoline leads to lowering exhaust emissions
from the all vehicles equipped three way catalyst systems.
150
SULEV
100
LEV1-LEV
LEV1-LEV
LEV2 ULEV
SULEV
50
LEV,ULEV
0
-50
0
100 200 300 400 500 600
Sulfur (ppmw)
Sulfur impact on Emissions
Sulfur effects on NOx catalyst performance is significant. Sulfur
free is essential to introduce this kind of system that achieves low
emissions and low fuel economy (low CO2).
NOx conversion (%)
＠#10-15mode
100
80
60
Sulfur
8 ppm
:
: 30 ppm
: 90 ppm
: 200 ppm
: 500 ppm
40
20
0
0
16000
mileage (km)
32000
Sulfur impact on Emissions
Fuel sulfur has also effects of PM from the engine installed
CRDPF system.
PM, g/kWh
0.500
0.400
0.300
Drysoot+H2O
Sulfate
SOF
100ppm
Japanese D13 mode
50ppm
0.200
10ppm
0.100
PM, g/kWh
0.000
0.500
0.400
0.300
Drysoot+H2O
Sulfate
SOF
100ppm
JARI test cycle
50ppm
0.200
10ppm
0.100
0.000
0
30000
0
30000
Mileage (km)
0
30000
Other impact of Sulfur
•Fuel sulfur promotes to produce sulfated ash on the DPF and
then plugged it. This caused detelioration of fuel economy and
lowering engine durability.
•Fuel sulfur increases cylinder bore wear in the engine equipped
EGR system to reduce NOx and shortens engine durability.
•When fuel sulfur in diesel fuel was reduced, lubricty is also
lowered at the same time. This causes fuel pump wear. Lubricity
improver should be added as fuel sulfur was reduced.
•Lowering sulfur reduces SOx emissions that is a cause of acid
rain.