The Study of Hydrocarbon Fuel Vapor Phase Deposits.
Quarterly progress rept. no. 11, 16 Nov 68-16 Feb 69,
ESSO RESEARCH AND ENGINEERING CO LINDEN NJ GOVERNMENT RESEARCH LAB
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It was shown that the major role of a polymeric surface such as Teflon during the autoxidation of a hydrocarbon such as Tetralin is to serve as an initiator for radical production via catalyzing the decomposition of tetralin hydroperoxide. This suggests that one way to screen various surface coatings for their effect on antoxidative deposit formation is to test their activity for the decomposition of typical jet fuel hydrocarbon hydroperoxides. In a study of the effect of various metal oxides surfaces on tetralin oxidation it was found that specific activity i.e., the activity per unit area varied markedly. High surface area per se did not guarantee increased activity as a very high area silica 300 sq mg was found to be completely inactive. In addition to the expected oxygenated products, the oxidation of tetralin at 115C was shown to produce an olefin i.e., 1,2-dihydronaphthalene. This is surprising since oxidative dehydrogenation of saturated hydrocarbons to produce an olefin is generally felt to be important only at much higher temperatures. These data indicate that oxidative dehydrogenation is probably a major reaction path in the complex autoxidative deposit formation process. Higher total pressure was found to increase both the level of deposit formation and the apparent activation energy for deposit formation of an olefin-decane blend. These results substantiate the conclusion previously advanced that the observed effect of pressure on deposit formation with jet fuels reflects an effect on the non-paraffin portion of the fuel. Author