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IMPACT OF METHANOL AND CNG FUELS ON MOTOR VEHICLE TOXIC EMISSIONS
Citation:
Black, F. AND P. Gabele. IMPACT OF METHANOL AND CNG FUELS ON MOTOR VEHICLE TOXIC EMISSIONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-91/240 (NTIS PB92110378), 1991.
Description:
The 1990 Clean Air Act Amendments require that the Environmental Protection Agency investigate the need for reduction of motor vehicle toxic emissions such a formaldehyde, acetaldehyde, benzene, 1,3-butadiene, and polycyclic organic matter. oxic organic emissions can be reduced by utilizing the control technologies employe for regulated THC (NMHC) and CO emissions, and by changing fuel composition. his paper examines emissions associated with the use of methanol and compressed natural gas fuels. oth tailpipe and evaporative emissions are examined at varied ambient temperatures ranging from 20 degrees F to 105 degrees F. ailpipe emissions are also examined over a variety of driving cycles with average speeds ranging from 7 to 48 mph. esults suggest that an equivalent ambient temperatures and average speeds, motor vehicle toxic emissions are generally reduced with methanol and compressed natural gas fuels relative to those with gasoline, except for formaldehyde emissions, which may be elevated. s with gasoline, tailpipe toxic emissions with methanol and compressed natural gas fuel generally increase when ambient temperature or average speed decreases (the sensitivity to these variables is greater with methanol than with compressed natural gas). vaporative emissions generally increase when fuel volatility or ambient temperature increases (however, the relative contribution of evaporative sources to the aggregate toxic compound emissions is small).
