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

摘要： 采用碱溶液刻蚀法由工业生产的 N a Y分子筛原粉制备介孔 Y型分子筛。运用X射线衍射( XR D) 和 骨架红外光谱( F T I R) 表征样品的晶体结构, N2 吸附等温线和扫描电镜( S EM) 表征孔结构和形貌特征, 并采用吡啶 红外光谱技术( P y - F T I R) 表征样品的酸性能。结果表明, N a Y分子筛在适当浓度的碱溶液以及较温和的条件下, 处 理后可保持分子筛晶体的拓扑结构和基本形貌结构, 但在处理过程中晶粒表面或晶粒内可被刻蚀出一定的缺陷介 孔结构。另外, 碱刻蚀前后对改性后 H型分子筛中B酸中心量的影响不明显, 但大大减少了L酸中心的数量。

关键词:  Y分子筛,  , 碱刻蚀, 介孔, 酸性