The present invention provides a catalyst to be used in the production of alkenyl aromatic compounds from alkyl aromatic compounds through dehydrogenation by using steam as diluent, which is free from the choking and corrosion caused on the downstream side of a reactor by an alkali metal component scattered from the catalyst during reaction; a process for the preparation of the catalyst; and a process for dehydrogenation with the same. More specifically, provided is a solid catalyst which is free from problematic alkali metals that are liable to be scattered in the presence of high -temperature steam and which bears a component having high redox catalysis.