The paper concerns the investigation on dynamics of nonisothermal catalytic fluidized-bed reactors. Based on the idea of quasi-stationarity of the profiles of bubbles the transient state models were developed and tested for a fluidized-bed heat exchanger, a single catalytic reactor as well as for a set of coupled reactors. It was shown that in the cases of quantitative analysis of dynamic phenomena of the objects with gas-solid fluidized beds the proposed approach reveals high efficiency.