As new opportunities are being explored to use the monolith form of re
actor for process applications and to integrate within one unit endo-
and exo-thermic reactions, the importance of modelling channel interac
tion under these conditions is being recognized. Mathematical models a
re generally either of a one or two dimensional form. In a number of a
pplications, the complexity of incorporating two dimensional models in
to a multichannel system would not be practicable. The development of
a mathematical model for a reacting, nonadiabatic, multichannel monoli
th is described, in which the following processes are modelled: homoge
neous and heterogeneous reactions, convection, axial and radial wall c
onduction, and heat transfer by radiation. The catalytic combustion of
methane is selected as an example process, The effects of a 'hot spot
', as a result of fuel maldistribution, are simulated for a Fecralloy(
R) based monolith support system.