This study aims at the development of H-ZSM-5 catalysts for the conversion of dimethyl ether to gasoline-like hydrocarbons. In order to improve the lifetime and selectivity of the catalyst, mesopores have been introduced into the basic structure of H-ZSM-5. Modified industrial ZSM-5 materials were prepared by postsynthetic desilication as well as by a direct synthesis via soft templates. The samples were analyzed and the commonly applied methods were examined critically. The surface to volume ratio of the mesopores is presented as a new measure. The testing of the catalysts was carried out in a laboratory plant. The results point to a complex interaction of acid centers and mesoporosity.