The origin of soot in flames: is the nucleus an ion?

摘要: There are two schools of thought on how soot originates in a fuel-rich flame. On the one hand, ionic theory postulates that small ions, such as C3H3+, act nuclei, so species C2H2 and C4H2 add to them, occasionally liberate H2 repetitive growth process. Once these ions become large (≈2000 a.m.u.) they supposedly dissociate produce an uncharged, but large, hydrocarbon “molecule,” which can grow, coalesce or coagulate give particles. Simultaneously this dissociation produces very ion, repeats process adding C2, C3, C4 species, etc. The other school believes fairly similar processes occur, involved not uncharged radicals molecules. This present study has spectroscopically monitored level sooting earliest stages its production premixed, oxyacetylene flame at 1 atm. If from addition relatively quantity easily ionized cesium removes C3H3+ In case there should also be less produced. When either distilled water strong aqueous solution CsCl was nebulized into flame, intensity emission fell by same amount. only ∼ 1% part burned gas, rose larger drop farther downstream reaction zone. Thus itself no effect early premixed indicating is evidence here for acting nuclei soot. However, alone does inhibit