Commercial amorphous silica-alumina (denoted as ASA) were supplied by Sasol Germany GmbH and used after calcination in air at 550 °C for 6 h. HY-5 catalyst was obtained by exchanging NaY three times with an aqueous solution of NH4NO3 (1 M, 60 °C, 1 h) and subsequent calcination in air (2 K min -1 , 550 °C, 6 h). γ-Al2O3 (99.9 %) was obtained from Alfa Aesar and Evonik Aeroperl 300/30 was used as pure SiO2.