Catalytic cracking of n-pentane over CLD modified HZSM-5 zeolites

Abstract

With the intrinsic MFI structure well-preserved, HZSM-5 zeolite was controllably surface-modified via a CLD (chemical liquid deposition) strategy and wrapped by tailorable porous SiO₂ or TiO₂ overlayers. It was found that the CLD-modified catalysts brought about a (maximum 46%) promotion of catalytic activity using the catalytic cracking of n-pentane as a model reaction at 500 °C, attributed to the enhanced sorption process caused by the porous overlayer. In addition, TiO₂-CLD modified zeolites exhibited a better catalytic cracking performance compared with SiO₂ that was probably due to the extra Lewis acid sites generated by TiO₂.