Reduction-oxidation cycles in a fixed-bed reactor with periodic flow reversal

The operation of chemical reactions and processes in an unsteady-state regi me can lead to a better use of energy and matter in the available feedstock . Two examples are the periodic change of the flow direction while operatin g an exothermic reaction in an adiabatic fixed-bed reactor (reverse-now rea ctor) and the splitting up of heterogeneously catalyzed oxidation reactions into two separate gas-solid reactions (reduction and oxidation step). In t his study, the advantages of both concepts are used and an investigation of the combination for two-step processes (reaction concept) and reverse-now reactors (reactor concept) with chemical reaction engineering techniques ar e shown.