Process for the oxidative regeneration of a deactivated catalyst and an apparatus therefor

The present invention relates to a process for the oxidative regeneration of a deactivated catalyst, an apparatus therefor and a process for the preparation of an olefinic product incorporating such a regeneration process, said oxidative regeneration process comprising at least the steps of: - providing a catalyst comprising molecular sieve in hydrogen form to a guard zone (200); - passing a regeneration gas stream (185, 185a) comprising oxidant through the guard zone (200) to remove at least a part of one or both of any alkali metal ion and any alkaline earth metal ion from the regeneration gas stream (185, 185a) by ion exchange with the catalyst, to provide a treated regeneration gas stream comprising oxidant (205); - providing deactivated catalyst comprising molecular sieve in a regeneration zone (100), said deactivated catalyst from one or both of an oxygenate to olefin process and an olefin cracking process, wherein said regeneration zone (100) is separated from said guard zone (200) such that there is n