Possible bad press for E10, E85
#1
Possible bad press for E10, E85
Toyota did some pretty substantial-sounding testing in 2000, and CARB published it recently. They found the running E10 instead of MTBE as the oxygenate produced 5.5% higher levels of NOx out the tailpipe.
Although its well-known that evaporative emissions increase noticeably with ethanol, I was not aware of any studies showing an increase in NOx (smog precursors).
They mention that CO (also a smog precursor) output dropped 6%. So on balance using ethanol still lowers (barely) the total smog-making emissions. But that is not pointed out. And NOx primarily assists in ozone producton only in the presence of CO, so less CO still means less ozone.
http://www.greencarcongress.com/2006...s_e1.html#more
source doc: http://www.arb.ca.gov/fuels/gasoline...yota_prstn.pdf
Although its well-known that evaporative emissions increase noticeably with ethanol, I was not aware of any studies showing an increase in NOx (smog precursors).
They mention that CO (also a smog precursor) output dropped 6%. So on balance using ethanol still lowers (barely) the total smog-making emissions. But that is not pointed out. And NOx primarily assists in ozone producton only in the presence of CO, so less CO still means less ozone.
http://www.greencarcongress.com/2006...s_e1.html#more
source doc: http://www.arb.ca.gov/fuels/gasoline...yota_prstn.pdf
#2
Re: Possible bad press for E10, E85
While almost interesting, it's not really relevant anymore since MTBE has already been banned. I'd rather see a similar testing done against regular 100% untreated gasoline. The slideshow PDF only compares against MTBE treated gasoline.
#3
Re: Possible bad press for E10, E85
MTBE has been banned in a few states, not nationally. The EPA's rule change only removed the requirement for any oxygenation in RFG/tierIIRFG...in anticipation of the upcoming renewable fuels secion of the 2005 energy act requiring ethanol content wich effectively re-requires it in a few years.
#4
Re: Possible bad press for E10, E85
Unfortunately, here in Houston, the EPA looks at each pollutant separately. We are currently in non-attainment status in regards to NOx, and we're switching over to E10 soon. This could have a serious impact on our region's ability to meet our NOx requirements.
Jeff
Jeff
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08-06-2009 07:12 AM