Zeolites are microporous alumino-silicate materials of very well defined crystal structure and thermal stability. Due to their structure, a crystal channels and pore openings can be of various size (0.2-1.3 nm) and shape.The number of available Lewis' (sometimes Bronsted) acid sites at solid state catalysts, such as zeolites, is crucial for efficiency of catalysed organic reactions. In order to elucidate the role of different zeolite structures (MFI, MOR, BEA, FAU) on catalytic properties for methanol to olefin conversion, various micrometer sized zeolite crystals (ZSM-5, mordentie, beta, ZY) will be synthesized. Improvement of their catalytic abilities will be realized by systematic study via two approaches: - increase of available surface at crystals, and - increase of the number of acid sites.The crystals surface can be enlarged through reduction of its size (by synthesis of nanometer sized crystals) or by creation of larger pores on micrometer sized crystals. Mesoporosity of the crystals will be obtained by synthesis of hierarchical zeolites using dual (or multi) template synthesis and by dealumination/desilication technique. Another way to increase the number of acid sits in prepared zeolites is introduction of certain metal cations (Ti, Zr, Fe, Sn) exploiting solid state ion exchange via grinding or/and via wet impregnation. The number of catalytic acid sites will be determined using vacuum FTIR spectroscopy of adsorbed pyridine or similar probe molecules.Additional post-synthesis treatment of obtained hierarchical zeolites will be done through incorporation of the nanometer sized metal-oxides (obtained by sol-gel method) to form hybrid (composite) catalyst. Many techniques/methods will be used for characterization of samples structural, particulate and catalytic properties, such as: PXRD, AAS, OM, SEM, TEM, LLS, FTIR, NMR, DR-UV/Vis, TG-DTG, N2 adsorption/desorption, PALS.