Survey of Recent Methane Pyrolysis Literature

The Thermal Decomposition of Methane. I. Kinetics of the Primary Decompositionto C2H6 + H2; Rate Constant for the Homogeneous Unimolecular Dissociation of Methane and its Pressure Dependence

“…Alternatively, it might be suggested that the dependence of k, on methane pressure could arise from a complex radical-chain mechanism. The only possible propagation step in pure methane appears to be This has frequently been suggested in the past (I), and together with [2] constitutes a chain yielding C2H6 and H,. There are several arguments against such a chain in the methane pyrolysis.…”

“…In the earliest stages where only [I], [2], and [3] are important the yield of hydrogen was equal to the yield of ethane and no pressure increase was observed. As [4] and [5] [4] and [5].3 These and other subsequent secondary reactions will not be discussed further in the present paper which is concerned chiefly with the rate of [I].…”

“…[Traduit par le journal] Introduction Although the pyrolysis of methane has been studied many times before, important details of the reaction mechanism have remained obscure (1)(2)(3)(4)(5). It is well established that the initial products are C2H6 and Hz, and in some shock-tube experiments the pyrolysis has been effectively limited to this ftage and initial rates measured.…”

Direct Aromaization of Methane

“…The thermal decomposition of methane has been studied extensively over the past 50 years and has been reviewed on numerous occasions (Back and Back, 1983;Khan and Crynes, 1970). The formation of higher hydrocarbons is generally perceived to follow a stepwise dehydrogenation of intermediates evolved from homogeneous methyl radical propagations.…”

“…Most of the studies, however, were performed at low temperatures (<lOOO°C), pressures, and conversions ( 4 0 % ) in order to limit the extent of reaction and derive kinetic and mechanistic interpretations. (Khan and Crynes, 1970).…”