By John P. Longwell (auth.), Lawrence B. Ebert (eds.)
On March 30, 1981, a symposium entitled "Chemistry of Engine Combustion Deposits" used to be held on the 181st American Chemical Society nationwide assembly in Atlanta, Georgia, less than the sponsorship of the Petroleum department. This publication is an out development of that symposium, together with papers from all the At 1 anta presentors, as we eleven as from others who have been i nvi ted to give a contribution. study on engine deposits has now not been as "glamorous" as within the rel ated fossil gasoline components of petrol eum, coal, or oil shale, and courses within the box were mostly constrained to combustion and automobile engineering journals. One objec tive of this booklet is to deliver a wide physique of labor at the chemistry of deposits into extra basic accessibility. we are hoping to make humans extra accustomed to what deposits are, with what difficulties they reason, and with what current employees are doing to unravel those difficulties. The production of the e-book has concerned many folks. Patricia M. Vann of Plenum Publishing company gave information in making plans. We thank Claire Bromley, Ellen Gabriel, and Halina Markowski for the coaching of the various Exxon contribu tions. eventually, we thank Joseph C. Scanlon for his worthy suggestion and encouragement.
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Extra info for Chemistry of Engine Combustion Deposits
5. This would occur if much of the Zn and Mg were oxides rather than the phosphate. The P/Zn atom ratio also shows this distinction. 0. 2" while this ratio is consistently 32 lower in samples from other areas. Therefore, the inorganic compounds on the exhaust valve are different from those on other surfaces. This is probably due to the much higher temperature of the exhaust valve surface. Cylinder Differences An objective of this study was to determine if the chemical composition of the deposits can account for ORI.
Although the high boiling components which were once present in both fuels and lubricants have largely been removed, in some cases they have been replaced with synthetic materials of even higher molecular weights. 2-4 The polymeric additives are present in lubricant formulations as detergents, dispersants, friction modifiers, and VI improvers, and in some fuel formulations as intake system detergents. It is certainly possible that highly oxygenated polymer fragments, formed from partial combustion of the polymers, could function as binders to enhance deposit accumulation.
In TGA the weight of the sample is continuously recorded as the temperature is raised at a controlled rate. The analysis may be carried out in air or under an inert atmosphere such as argon. Initial weight losses usually correspond to the volatilization of lower molecular weight compounds whereas higher temperature weight losses may involve the thermal degradation (breaking of chemical bonds) of large organic and/or thermally unstable inorganic compounds. The transition from one thermal phenomena to another is usually indicated by a change in slope of the weight loss versus temperature curve.