Generalised criteria for the stability of catalytic reactors

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Abstract
It is well known that particles catalyzing highly exothermic reactions can have multiple steady states, which are characteristic of unstable behavior. Previous work has shown that under practical conditions the pellets are essentially isothermal, all the temperature rise being across the surrounding fluid film. A technique has been developed for such cases which enables the regions of potential local instability, if present, to be defined for arbitrary operating conditions. It is thus possible to monitor the calculation of concentration and temperature profiles in a fixed bed reactor to ascertain whether the conditions would represent multiple states and therefore non‐feasible operating conditions.

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