Abstract
Abstract The effect of Cl on polycyclic aromatic hydrocarbon (PAH), soot, and tar yields from fuel rich combustion is studied using a jet-stirred reactor close-coupled with a plug flow reactor system (JSR/PFR). The JSR provides input to the PFR from the fuel rich (φJSR = 2.2) combustion of C2H4/O2/N2, and chlorine is introduced into this stream at the PFR inlet via addition of CH3Cl (φPFR = 2.3). This experimental condition is compared to second condition where C2H4 is added (φPFR = 2.3) to the PFR in lieu of CH3Cl. PAH yields are seen to increase under both conditions at early PFR residence limes, while coming to an equilibrium value, or even decreasing in concentration at the end of the PFR. However, the yield of cyclopenta(cd)pyrene, a major human and bacterial cell mutagen, is suppressed with Cl present by as much as 90% near the end of the PFR, while benzo(a)pyrene, a major human carcinogen, shows a decrease in yield of about 25%. Tar (defined as total CH2Cl2 soluble material) is split into a low mol...
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