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This paper is the fourth and final paper in a series providing fuel blending and analysis data for the Auto/Oil Air Quality Improvement Research Program (AQIRP), essentially detailing the work of the Fuels Blending Subcommittee (FBSC) and portions of the work of the Fuels Analysis Subcommittee (FASC). This paper covers fuels for the final follow up projects in Phase II. Blending procedures, feedstock preparation and analytical techniques are explained, and blend recipes, full physical properties and compositional data are given. In addition, a survey of commercial gasolines carried out in cooperation with the MVMA (Motor Vehicle Manufacturers Association) is reported. Regional and national fuel sampling and subsequent derivation of composite fuels is explained briefly, and fuel analysis data produced by the FBSC are presented. Papers by Pahl and McNally (1)*, Gerry et al. (2), and Kopp et al. (3), have presented the corresponding data for the forerunning Phase I and II AQIRP work.

This paper is the third in a series providing fuel blending and analysis data for the Auto/Oil Air Quality Improvement Research Program (AQIRP). Preparation methodologies, analytical techniques and fuel property data are presented for the Heavy Hydrocarbon/Volatility study and other programs not previously reported. Papers by Pahl and McNally (1)* and Gerry et al. (2) have presented information on the fuels of the AMOT (Aromatics, MTBE, Olefins, T90), Methanol, RVP/Oxygenate and Phase I and II Sulfur programs. The Heavy Hydrocarbon/Volatility fuel study was initiated in an effort to better understand the 90% distillation point (T90) effect observed in the AMOT matrix of Phase I. The study was comprised of two matrices and twenty-six fuels. The first eighteen-fuel matrix, designated as the “A” matrix, investigated the effects of medium, heavy and tail reformate and medium and heavy catalytically cracked components.

One goal of the Auto/Oil Air Quality Improvement Research Program (AQIRP) is the development of models which will predict the emissions characteristics of gasoline blends based on fuel composition. Speciation, the analysis of individual species in samples of gasoline or gasoline blend components, provides a key input to the development of such models (1)*(2)(3). Information on gasoline speciation has also been used to correlate fuel composition with combustion chamber deposits (4). The Fuels Analysis Sub-Committee of the AQIRP has implemented a capillary gas chromatography method for gasoline speciation. This method, commonly referred to as the Detailed Hydrocarbon Analysis method, or DHA, was cooperatively tested in seven laboratories with six samples. Examination of well resolved components in four of the six samples shows that the range of results obtained in the different laboratories typically varies by about 11% of the inter-laboratory mean.

This paper presents fuel property data and associated analytical methodology used in blending test fuels for portions of Phase I and Phase II of the Auto/Oil Air Quality Improvement Research Program (AQIRP). Information presented in this paper supplements the first published report of AQIRP fuel blending results by Pahl and McNally (1).* Fuel blending data are presented covering two segments of Phase I of the Program. The first is a two fuel matrix where the sulfur level is varied at two levels (50 and 450 ppm) through the addition of ditertiarybutyl disulfide. The second is an eleven fuel matrix where the effects of both volatility adjustment and oxygenate addition are investigated. Oxygenates tested include MTBE (methyl tertiary-butyl ether), ethanol, and ETBE (ethyl tertiary-butyl ether). Fuel volatility adjustments are made by changing RVP (Reid Vapor Pressure). Included with the fuel physical property data are individual fuel speciation profiles for all Phase I fuels.