MMT (Methylcyclopentadienylmanganese tricarbonyl) revisited: EPA's conclusions. The effects of MMT on exhaust emissions
Conference
·
· SAE Passenger Car Meet. Pap.; (United States)
OSTI ID:6538451
Statistical analysis carried out by EPA of data on MMT use collected in 50,000 mi fleet studies by various automobile manufacturers and related firms indicated that Ethyl Corp.'s MMT antiknock additive very probably affects oxygen sensor performance adversely, which leads to increased hydrocarbon (HC) and CO emissions in three-way-catalyst systems. The so-called ''catalyst-enhancement'' effects, for which the supporting data are tenuous, is at best a weak effect that does not overcome the negative effect of MMT on engine-out emissions. The absence of an adverse effect on combustion-chamber deposits due to MMT use has not been established; rather, the few data available suggest that MMT has a strong effect on combustion-chamber deposits, which in turn, increase the engine-out HC emissions. No direct (instantaneous) effect of MMT on fuel economy was perceptible, but automobile manufacturers indicate that if engine-out HC deposit increases due to MMT use require engine recalibration, some fuel economy penalty could occur. Indications of an increasing potential for catalyst plugging with long MMT use could necessitate increasing the MMT concentration (as manganese) to 0.0625 g/gal fuel. No consistent adverse effects on CO or NOxi emissions were noted.
- Research Organization:
- EPA
- OSTI ID:
- 6538451
- Report Number(s):
- CONF-7906132-
- Conference Information:
- Journal Name: SAE Passenger Car Meet. Pap.; (United States) Journal Volume: 790707
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of combustion chamber deposit location and composition. [MMT is the antiknock fuel additive methylcyclopentadienylmanganese tricarbonyl]
Effects of Mn deposits from MMT on automotive catalysts in the absence and presence of other fuel additives. [Methylcyclopentadienyl manganese tricarbonyl (MMT)]
Induction of chromosomal aberrations by the fuel additive methylcyclopentadienyl-manganese tricarbonyl (MMT) in Chinese hamster ovary cells
Conference
·
Sat Feb 28 23:00:00 EST 1981
· Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)
·
OSTI ID:6545400
Effects of Mn deposits from MMT on automotive catalysts in the absence and presence of other fuel additives. [Methylcyclopentadienyl manganese tricarbonyl (MMT)]
Conference
·
Mon Aug 01 00:00:00 EDT 1977
· Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States)
·
OSTI ID:6917054
Induction of chromosomal aberrations by the fuel additive methylcyclopentadienyl-manganese tricarbonyl (MMT) in Chinese hamster ovary cells
Journal Article
·
Tue Oct 31 23:00:00 EST 1995
· Environmental and Molecular Mutagenesis
·
OSTI ID:115114
Related Subjects
02 PETROLEUM
025000 -- Petroleum-- Combustion
33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
ADDITIVES
AUTOMOTIVE FUELS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
COMBUSTION CHAMBERS
DATA
DEPOSITS
EMISSION
EXHAUST GASES
FLUIDS
FUEL ADDITIVES
FUEL ECONOMY
FUELS
GASEOUS WASTES
GASES
HYDROCARBONS
INFORMATION
NATIONAL ORGANIZATIONS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE
US EPA
US ORGANIZATIONS
WASTES
025000 -- Petroleum-- Combustion
33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
ADDITIVES
AUTOMOTIVE FUELS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
COMBUSTION CHAMBERS
DATA
DEPOSITS
EMISSION
EXHAUST GASES
FLUIDS
FUEL ADDITIVES
FUEL ECONOMY
FUELS
GASEOUS WASTES
GASES
HYDROCARBONS
INFORMATION
NATIONAL ORGANIZATIONS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE
US EPA
US ORGANIZATIONS
WASTES