Particulate matter (PM) exhausted from a diesel
engine is produced mainly from diesel fuel.
In Part 2, of this papers series the ratio of
hydrogen to carbon in the whole fuel (H/C) and
the back end fraction at the temperature corresponding
to T80-T90 (e.g. 310°C),
R310, were found as the parameter showing
the tendency of the fuel to form soot and the
parameter closely related to SOF, respectively.
As a result, the regression equation consisting
of H/C and R310 was found to be effective
in estimating PM emission.
Considering more advanced reformation of diesel
fuel in future, the evaluation with inclusive
parameters, such as H/C, will be insufficient
to examine the relationships between fuel properties
and PM emissions, and more precise evaluation
of diesel fuel will be required.
In this study, to construct a series of precise
analytical methods, evaluation of the distribution
of hydrocarbon by double bond equivalence value
(DBE), which corresponds to H/C distribution,
and that of the amounts of carbon in the different
partial structures, such as straight chain and
branch, were added to the conventional methods,
such as elementary analysis and high pressure
liquid chromatography.
As the methods to obtain DBE distribution and
the amounts of carbons in different structures,
field ionization mass spectrometry and nuclear
magnetic resonance spectrometry were studied,
respectively. The high pressure liquid chromatography
fractions for these analyses were concentrated
by the enricher which was developed in this study.
The precise analytical methods were applied to
the analyses of commercial fuels in Japan and
Sweden to ascertain the validity of the methods.
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