Abstract: Y zeolites with different pore structural and acid properties were studied by XRD, N₂ physical adsorption, NH₃-TPD and PyFTIR. The adsorption and diffusion properties of benzene in hierarchical pore Y zeolites were investigated by using intelligent gravimetric analyzer (IGA). It was found that there was no obvious change in the crystal structure of the Y zeolites in the process of modification, while the pore structure, acid type, acidity and acid strength were changed. The mass transfer performance of benzene molecules in the pore level Y zeolite molecular sieve was mainly decided by pore structure. The larger of pore volume Y molecular sieve was, the faster diffusion rate was. It was more conducive to the diffusion of benzene molecule. The amount of saturated adsorption of benzene molecule was depended on the type and intensity of acid type of Y zeolite.

Key words: Hierarchical pore Y zeolite, Acid active site, Benzene molecule, Adsorption and diffusion

摘要： 以不同等级孔Y型分子筛为研究对象,运用XRD、N2 吸附、NH3-TPD和Py-FTIR对其织构性质和酸性质进行表征。采用智能重量分析仪(IGA)等技术考察了苯在等级孔Y 型分子筛上吸附扩散性能。结果表明, 等级孔Y型分子筛在改性过程中晶型结构未发生明显变化,但改变了其孔道结构、酸类型、酸量及酸强度。苯分子在等级孔Y型分子筛上的传质性能主要与分子筛的孔道结构有关,等级孔Y 型分子筛的孔容越大,扩散速率越快, 更利于苯分子的扩散。而苯分子的饱和吸附量大小主要取决于等级孔Y型分子筛的酸中心类型及其强度。

关键词: 等级孔Y型分子筛, 酸性活性位, 苯分子, 吸附与扩散