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Journal of Catalysis

Effectiveness of biporous catalysts for zero-order reactions

A simple method of solution is highlighted for solving a class of bioreaction-diffusion problems. By virtue of the proposed transformation the original boundary value problem is rendered into an equivalent initial value problem. Results are comparable to conventional methods, and have lower computational time requirements. © 1991 Science and Technology Letters.

Biotechnology Letters

A simple method of solution for a class of bioreaction-diffusion problems

Multiple steady states are known to exist in nonisothermal nonadiabatic systems for a certain range of parameter values. It has been elucidated that in a certain region of Damkohler numbers five steady states classified as kinetic, diffusion and intermediate regimes are possible. The results of the effects of the external fluctuations on the system behaviour are reported in this article. A nonisothermal nonadiabatic tubular reactor was analyzed in the presence of external disturbances. The study, while not revealing any noise induced transitions, clearly shows the preference of evolving states in the presence of noise.

World University root node

Hungarian Journal of Industrial Chemistry

Analysis of nonisothermal nonadiabatic tubular reactors in the presence of external disturbances

An analysis is presented for a gas-solid heterogeneous, noncatalytic reaction which propagates from the center. The results are compared with those for a shrinking-core model. The analysis reveals that the reaction rate.can exhibit a maximum or a discontinuity. For a first-order reaction, the moving reaction interface is always stable toward a one-dimensional perturbation. © 1987, American Chemical Society. All rights reserved.

Industrial and Engineering Chemistry Research

An Expanding Core Model for a Heterogeneous, Noncatalytic, Gas-Solid Reaction

Prasannan et al. (1985, Chem. Engng Sci. 40, 1251-1261) developed a mathematical model to account for the effect of inerts on gas-solid reactions. The model is experimentally verified in this paper. A reaction system involving capture of CO2 by freshly prepared lime pellets was chosen and varying amounts of inert particles were added to the reactive particles to study the effect of this addition on the progress of the reaction. These results can be of great significance in achieving better solids utilization in many industrial systems, particularly where expensive solid sorbents are used for gas removal purposes. © 1987.

Chemical Engineering Science

A experimental study of the effect of inerts on gas-solid reactions

International Journal of Heat and Mass Transfer

A Stefan problem for exothermic non-catalytic reactions

AIChE Journal

Simple method for solution of a class of reaction‐diffusion problems

The present paper analyzes the consequences of coupling two independent CSTRs operating under different stability conditions. A variety of behavioural patterns of the coupled system have been shown to exist for different types of reactor combinations, viz. stable-stable, oscillatory-stable and oscillatory-oscillatory. The reactor output is in general sensitive to the exchange coefficient, a proper choice of which can be of use in practice. The results obtained also provide an explanation for the occurrence of aperiodic behaviour. More importantly, the present simple model, viz. the linear coupling of the lumped parameter systems, offers guidelines for the analysis of more complex distributed parameter systems such as catalyst pellet or the fixed bed. © 1983.

Dynamic behaviour of coupled CSTRs operating under different conditions

The Chemical Engineering Journal

An effectiveness factor for surface diffusion with product inhibition

Isothermal multiplicity on catalytic surfaces: Application to CO oxidation

Isothermal multiplicity on catalytic surfaces

Effectiveness factors in bidispersed catalysts: the general nth order case

An analysis of zero-first and first-first order reaction schemes has been carried out in a fluidised bed with a view to optimising the production of intermediate R for a given bubble diameter. For the zero-first order reaction sequence, the gas residence time at which the maximum concentration of R occurs is shown to be fixed and independent of bubble size in the bed. On the other hand, for a first-first order reaction scheme, an optimum gas residence time exists for the concentration maximum to occur at the bed exit. This interaction between bubble diameter, gas residence time and maximum concentration of intermediate is resolved by recourse to a three dimensional diagram which optimises the production of intermediate for any given value of bubble diameter or gas residence time. © 1981.

Optimal production of intermediate for zero-first and first-first order reaction sequences in fluidised bed reactors1 1 TNCL Communication Number 2464.