Methane Pyrolysis Stimulated by Admixture of Atomic Hydrogen: 1. An Experimental Study

A method for enhancing the hydrocarbon pyrolysis process by introducing atomic hydrogen into the reaction medium from an arcjet plasma source was considered. It was shown that hydrogen atoms could effectively be introduced by mixing under low pressure. The atomic hydrogen–stimulated methane pyrolysis process was experimentally studied in a continuous stirred reactor with a plasma plume. When hydrogen atoms were present in the plasma jet, the amount of the valuable product increased by a factor of two.     

FIRST EXAMPLES OF MOLECULAR POLYCHALCOGENIDE COMPLEXES OF THULIUM

Journal of Structural Chemistry - Two new polychalcogenide complexes of thulium are obtained by the interaction of $$[\text{Cp}'''_2 \text{Tm}]$$...     

Experimental study of gasification of vacuum residue in metal melt by alternating reactor feeding with carbonaceous feedstock and oxidant

Processes occurring in a metal melt during plasma-assisted melt gasification of carbonaceous feedstock have been studied in the mode of alternating feeding the reactor with the carbonaceous feedstock and oxidant. Vacuum residue was used as an oxygen-free carbonaceous material, and air and steam were used as an oxidant. The results of the study show that by alternating the carbonaceous-feedstock pyrolysis step and the step of carbon oxidation in the metal melt, it is possible to produce synthesis gas with any desired H₂/CO ratio.     

Study of the reduction of silicon monoxide in arc plasma

The results of study aimed to reveal the existence of kinetic limitations on the reduction of silicon monoxide with methane carbon in arc plasma in relation to the potential use of this process in the proposed advanced technology for manufacturing pure silicon are reported. It was concluded that the amount of silicon monoxide should be two times its stoichiometric amount required for the complete consumption of the methane carbon and there are no kinetic constraints on the process of silicon monoxide reduction over a time of τ = 4–5 ms at atmospheric pressure and a temperature of T = 2240–2350 K.     

Methane Pyrolysis Stimulated by Admixture of Atomic Hydrogen: 2. Mechanism Analysis and Kinetics Calculation

The kinetics of methane pyrolysis stimulated by the introduction of atomic hydrogen into the reaction medium from an arcjet plasma source was analyzed. Numerical simulation of the reaction kinetics demonstrated that the thermal pyrolysis at lower temperatures (1800 K or lower) followed the radical chain mechanism with short chains (a chain length of 2 or 3), and the addition of atomic hydrogen considerably increased the rate of the process. An analysis of the kinetics of pyrolysis in a stirred reactor showed that acetylene was formed immediately after methane degradation without the buildup of by-products in the reaction medium.__________Translated from Khimiya Vysokikh Energii, Vol. 39, No. 4, 2005, pp. 312–316.Original Russian Text Copyright © 2005 by Baranov, Demkin, Zhivotov, Nikolaev, Rusanov, Fedotov.