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The reactions involving aromatic hydrocarbons play a crucial role in the combustion chemistry for the formation and growth of polyaromatic hydrocarbons (PAHs). In this work, the thermal decomposition of the single ring aromatics benzene, phenyl and ortho-benzyne have been investigated behind reflected shock waves by using a sensitive detection technique - Atomic Resonance Absorption Spectroscopy (ARAS).The unimolecular decomposition of ortho-benzyne was investigated behind reflected shock waves by taking 1,2-diiodobenzene as the thermal source. The initial concentration of ortho-benzyne was determined in situ with I-ARAS. Simultaneously, the progress of reaction was monitored by measuring the produced H atoms with H-ARAS. By reproducing the experimental H atom concentration time profiles, a two channel decomposition model of ortho-benzyne was developed.By investigating the thermal decomposition of phenyl and benzene, a complete detailed chemical reaction model was elaborated which is able to capture the measured H atom concentration profiles over the whole investigated parameter range.Thus, the present work may contribute to a better understanding and describing of high temperature combustion of aromates which are considered as major soot precursors.
The scientific and economic importance of the high-temperature reactions of hydrocarbons in both the presence and absence of oxygen cannot be overemphasized. A vast chemical industry exists based on feedstocks produced by the controlled pyrolysis of hydrocarbons, while uncontrolled combustion in air is still among the most important sources of heat and mechanical energy. The detonation and explosion of hydrocarbon-oxidant mixtures can however, be a highly dangerous phenomenon which destroys lives and equipment. In order that control can be exerted over combustion processes, a complete description of hydrocarbon oxidation and pyrolysis is required. A major contribution to this is an understanding of the unstable intermediates involved and their reactions. The aim of this book is to review our knowledge of the chemistry of hydrocarbon combustion and to consider the data which are available for relevant reactions. Chapter 1 describes early studies in which the apparent complexity of the chemistry was established and the type of information required for a better understanding was defined. Experimental studies of the overall process which were carried out with the aim of establishing the sequence of stable chemical intermediates and some of the unstable species are described in Chapter 2. The limited nature of the information thus obtained showed that independent studies of individual reactions involving the unstable species were required. In Chapter 3 investigations specifically aimed at the determination of the kinetics of elementary reactions are discussed.