Analytical investigations of isooctane and diisobutylene slow combustion in an Otto-cycle engine

✍ Scribed by R.L. Bradow; M. Alperstein

• Publisher: Elsevier Science
• Year: 1967
• Tongue: English
• Weight: 524 KB
• Volume: 11
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(67)90006-5

✦ Synopsis

Samples of end.gas from an Otto.cycle engine operated on isonelune and isooelan¢ diisahtnyl,.'lle mi~,lurcs ~ ere ar~aly~xt for.,,tow combustion prodnct~, by gits cltromatt~gr:tphy. The: IormatJon of twcnty-.,,cvcnn praducts of isoo¢lane slow combustion were followed in lime from I",d~re iguilion in Ilear comple;c Ctt~lfgc mllammation. Olefiw, were Ibund to increase late in the cycle much more rapidly than the other major produczs, cyclic ¢ther~. The cyclic ethers folJnd are principally ring-do~'d belween a primary and a secondary or tertiary po,,ilion, The result,, :ire accounled for by a simple reaction scheme which prnpo,;~.'s that alkyl radical pyrolysi.~ and addition of m(flectilar oxygen are comp~qing pathways. Cyclic ether pyrolysis may al~o contribute to produ¢l Ibrmalion. The addition of dii~bulylcn¢ inhibits isooctan¢ product Ibrmalion. It is proposed that the observed irlhihiltOll account~, liar the reported octane number maximum wilh thc~' mixtures.

' End.gas i~ ddin~d as 1he last porlitm .f the dl~tre~:d eyland~r ~,,~s I~ i~ inflamed