Combustion Emission Characterization of E 0 , E 10 , and E 15 in Support of the Fuel and Fuel Additive Registration of E 15 Final Report

As tropospheric chemical models become ever more complex, reliable ratecoefficient data for gas-phase hydrogen abstraction reactions involving tracehydrocarbons becomes increasingly necessary. There are hundreds of non-methane hydrocarbons (NMHCs) of potential importance to troposphericchemistry, many of which have not been subjected to experimental inquiry. Thisstudy—the first of its kind to investigate hydrocarbons ranging from C2 to C10using topological indices—aims to provide a reliable and accessible method ofestimating rate coefficients for these species. Rate coefficients of free radicalabstraction reactions of NMHCs were correlated with the Randid and Balabantopological indices for radical moieties OH, CI and NO3. These correlations werecompared with those of an established frontier orbit al approach based oncalculated ionization potentials (IPs).The Randid index was found to correlate better than IP for each of the radicalsstudied, and correlated particularly effectively for the CI radical. The Balabanindex did not correlate for branched alkanes except forNO3. Where onlyunbranched alkanes were considered, the Balaban index proved most reliable,demonstrating a clear linear relationship. Topological indices present an accurateand diverse method for estimating free radical abstraction rate coefficients thatdoes not require the computing power, specialist software packages, or complexmathematics inherent in ab initio calculations. A further advantage of usingtopological indices is that they are calculated in an unambiguous manner. Morereliable tools for estimating rate coefficients have direct implications for improvingmodels, and may also provide a direction for future laboratory work, either byhighlighting particularly reactive species or identifying potentially spurious ratecoefficient data. Title:Pyrolysis and combustion of waste lubricant oil from diesel cars: Decompositionand pollutantsAuthor(s): M.J. Fuentes, R. Font, M.F. Gomez-Rico and I. Martin-GullonSource: Journal of Analytical and Applied Pyrolysis, Volume 79, Issues 1-2, May 2007,Pages 215-226Abstract: Pyrolysis and combustion of waste lubricant oil were studied due to its importantpotential value as a fuel. A thermogravimetric analysis in nitrogen atmosphereconditions and with different proportions of nitrogen:oxygen(N2, N2:02 mixtures at4:1 and 9:1 ratios), different weights (1, 2.5 and 5 mg) and different heating rates(5, 10 and 15 °C min) were carried out to study the thermal decomposition. Bothpyrolysis and combusti on can be represented in two processes: in the firstprocess, a volatilization of the oil takes place (this depends on the initial massand the heating rate) and in the second process there is a decomposition, whichis a different process in combustion from the process in pyrolysis.The identification of the volatile and semivolatile compounds from pyrolysis and