Quantification of uncertainty in reactivity adjustment factors from reformulated gasolines and methanol fuels

Article Abstract:

Uncertainty in the overall reactivity of the motor vehicle exhaust was evaluated by combining speciated data for exhaust emissions of volatile organic compounds (VOCs) with estimates of uncertainty in the calculated photochemical reactivities of the VOCs. Mean reactivity adjustment factor (RAF) values for emissions from reformulated gasolines compared with regular gasoline were between 0.85 to 0.93, with uncertainties of about 10%. This was 0.42 for methanol fuel compared to conventional gasoline, with a 17% uncertainty.

All Other Basic Organic Chemical Manufacturing, Petroleum Refineries, Industrial organic chemicals, not elsewhere classified, Gasoline, Methanol Fuel, Analysis, Alcohol fuels, Methanol, Reformulated gasoline

---

Speciated measurements and calculated reactivities of vehicle exhaust emissions from conventional and reformulated gasolines

Article Abstract:

New vehicle emissions regulations in California will use emission reactivity, defined as the potential to form atmospheric ozone, to determine the allowable mass of hydrocarbons, instead of being based solely on total hydrocarbons, as was previously done. Detailed, speciated procedures were developed to determine emission profiles of reformulated gasolines. The fuels tested were disappointing in that though they contained lower-reactivity components, chemical changes produced high-reactivity compounds in the exhaust.

Measurement, Environmental aspects, Pollutants, MTBE, Methyl tertiary butyl ether, Smog

---

Effect of chemical product yield uncertainties on reactivities of VOCs and emissions from reformulated gasolines and methanol fuels

Article Abstract:

Two limitations of previous studies on uncertainties are addressed. These are the uncertainties associated with product yields in the SAPRC90 chemical mechanism and correlations across some parameters. Earlier studies considered uncertainties in rate parameters as the only sources of uncertainty, when the product yields of many reactions of organic compounds are also uncertain. All mechanism parameters were also treated as independent in previous researches.

Similar abstracts:

• Abstracts: Identification of the cystic fibrosis gene: chromosome walking and jumping. Identification of the cystic fibrosis gene: cloning and characterization of complementary DNA
• Abstracts: Frequent flaps in the deregulated skies. Compensation beyond the call of duty. Coping with math anxiety
• Abstracts: Appraisal of the mass spectrometry/mass spectrometry of polychlorinated dibenzo-p-dioxins and dibenzofurans using new data
• Abstracts: Use of sensitivity analysis to compare chemical mechanisms for air-quality modeling. Photochemical modeling of the Southern California Air Quality Study
• Abstracts: Biomimetic extraction as a tool to identify chemicals with high bioconcentration potential. Influence of biotransformation on the relationship between bioconcentration factors and octanol-water partition coefficients

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.