Browsing by Author "Pikios, Constantine Andrew, 1949-"
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Item Concentration oscillations in heterogeneous catalysts(1975) Pikios, Constantine Andrew, 1949-; Luss, Dan; Wheeler, Lewis T.; Bailey, James E.The purpose of this study was to examine whether it is possible for concentration oscillations to occur in the case of the isothermal reaction A(g) + B(g)------>AB, which is taking place on a catalytic foil. By assuming a Langmuir-Hinshelwood kinetic mechanism in which the energy of activation for the final step depends linearly on the coverage by adsorbed B(g), we were able to derive the differential equations for the net rates of adsorption of A(g) and B(g). [...]Item Steady state multiplicity for two consecutive or isolated parallel first order reactions(1977) Pikios, Constantine Andrew, 1949-; Luss, Dan; Bailey, James E.; Jackson, Roy; Nachlinger, R. Ray.; Wheeler, Lewis T.This work examines and classifies the steady state behavioral features of lumped parameter systems in which either two consecutive first order chemical reactions A->B->C, or two independent first order chemical reactions A->P1, B->P2 occur. Both reaction schemes behave in a similar fashion, and it is shown that the case of A->P1, B->P2 can be treated as a special case of A->B->C. When both reactions are endothermic, a unique steady state solution exists. When both reactions are exothermic, a maximum of five steady state solutions could occur. When one reaction is exothermic and the other is endothermic a maximum of three steady state solutions may exist. When one reaction is isothermal and the other is endothermic a unique solution exists, while when both reactions are isothermal y=l is the only steady state solution. When the first reaction is exothermic and the second is isothermal, the problem degenerates to that of a single chemical reaction occuring in a lumped parameter system. However, when the first reaction is isothermal and the second is exothermic, a maximum of five steady state solutions may occur. [...]