1998 , Volume 3, № 4, p.13-23

A two-dimensional two-phase model of heat and mass transfer under the oxidation of a gaseous mixture in a cylindrical continuous reactor with a fixed-base layer of the catalyst is suggested, allowing for the radial distribution inhomogeneity of the layer porosity. The dynamic behavior of a system with an exothermic reaction is studied approximately analytically and numerically on the basis of the zero-dimension analogue of this model. The equations of bifurcational diagrams and parametric equations of the non-uniqueness and neutral stability boundaries on the plane of the effective temperature - effective concentration have been obtained. The effect of flow-catalyst mass-transfer coefficient on the domains with different number and stability of stationary regimes has been found and unique and non-unique steady and oscillatory oxidation regimes have been numerically implemented. The results obtained are in good agreement with the earlier data on the catalytic oxidations tability of a pseudohomogeneous model and the published solutions of unidimensional heterogeneous problems.

*80A20 Heat and mass transfer, heat flow

92E20 Classical flows, reactions, etc.