A process for catalytic dehydrogenation of a dehydrogenatable hydrocarbon process
stream to the corresponding olefin or olefins, the process comprising contacting
the dehydrogenatable hydrocarbon process stream under dehydrogenation conditions
with a mesoporous zeotype catalyst having an intra-crystalline, non-crystallographic
mesopore system and a mesopore volume of the zeotype crystals above 0.25 ml/g and
comprising at least one element belonging to Groups 5-14 in the Periodic Table
of the Elements (new notation). The invention also comprises a catalyst for use
in the above process.