关键词:  Y分子筛,  , 碱刻蚀, 介孔, 酸性

Abstract: Mesoporous Y Zeolites were prepared by alkaline solution etching method using industrial NaY zeolite powders as raw materials. The crystal structure of the samples was characterized using Xray diffraction (XRD) and skeleton Fourier transform infrared spectroscopy (FTIR). The pore structure and morphology were measured by N2 adsorption isotherms and scanning electron microscopy (SEM). The acid properties were characterized using pyridineinfrared spectroscopy (PyFTIR) technique. The results show that NaY zeolites can maintain the topology of zeolite crystal and basic morphology structure after treated in a suitable concentration by alkaline solution at mild conditions. A defected mesoporous structure in the zeolite is obtained in the process of alkaline solution etching. In addition, the alkali etching has little effect on the amount of B acid sites of H type zeolites, while, the number of L acid centers greatly reduces in the mesoporous Y Zeolites. 

Key words: Y zeolite,    ,  Alkaline solution etching,    ,  Mesopore,    ,  Acidity