Characterization and adsorption behavior of ZSM-5 zeolite film on cordierite honeycombs prepared by a novel in situ crystallization method

摘要

Thin films of ZSM-5 zeolite prepared on three types of cordierite ceramic honeycomb substrates by a novel in situ crystallization method were characterized by XRD, FTIR, XRF, SEM-EDX, NH_3-TPD and propane gas adsorption to examine the effect of the substrate on various properties of the ZSM-5 films. The substrates were both as-prepared and acid treated cordierite honeycombs. The XRD, FTIR and XRF re- Sults showed that silica-rich surface layers were formed on the surface of the honeyocombs by the acid treat- Ments. The SiO_2/Al_2O_3 ratios of the ZSM-5 zeolite formed on these layers increased with increasing time Of acid treatment.