Mathematical Modeling of Methane Air Conversion on a Structured Porous Metal Catalyst

A one-dimensional two-phase mathematical model of an ideal plug-flow reactor for methane air conversion on a Ni–MgO monolith catalyst on porous nickel was proposed. The model describes the methane air conversion as the result of three simultaneous reaction stages: methane deep oxidation, methane steam reforming, and reverse shift reaction. The effect of the external gas–solid mass transfer is taken into account in two variants: (i) independent diffusion and (ii) multicomponent diffusion for all mixture components. The results of modeling were used to analyze the experimental data (obtained in our previous work) on the dependence of the temperature of the front layer of the catalyst on the pressure and excess air coefficient. The best agreement between the calculation and experiment was obtained under conditions of complete external diffusion control of the exothermic stage for oxygen and the transition (between the kinetic and external diffusion) region of the endothermic stage, the kinetic effect of the endothermic stage being further limited by internal pore-diffusion resistance of the rate of this stage for methane.     

Self-oscillations on a partially wetted catalyst pellet in α-methylstyrene hydrogenation: Experiment and mathematical modeling

Self-oscillation modes on an irrigated porous catalyst pellet in exothermic hydrogenation accompanied by liquid evaporation is studied. By NMR tomography (magnetic resonance microimaging), images of the liquid-phase distribution within the porous object are obtained and the liquid-phase redistribution is monitored immediately during the process without destroying the object and without introducing any probes or molecular labels.Translated from Teoreticheskie Osnovy Khimicheskoi Tekhnologii, Vol. 39, No. 1, 2005, pp. 27–38.Original Russian Text Copyright © 2005 by Kirillov, Koptyug, Kulikov, Kuzin, Lysova, Shigarov, Parmon.     

Method of Nondestructive Testing for Technical State of Casing Strings in Oil-and-Gas Wells Basing on the Transient Electromagnetic Method

The laboratory investigations into electromagnetic parameters of the constructive elements of cased well are described. The algorithms, programs, as well as the results are discussed for the recovery of electromagnetic and geometric parameters of casing string by borehole measurements of electromotive force with the help of the transient electromagnetic method.