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A very general nonlinear distributed parameter filter is applied to laboratory data obtained from a fixedbed tubular catalytic reactor. The isomerization of -pentane on a platinum reforming catalyst which decayed in time was the system under investigation. A filtering algorithm to obtain the best on-line estimates of the coke content of the catalyst is outlined. The filter provided coke profile estimates which were more consistent than the model or the data alone for short catalyst lifetimes.

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