Abstract: The physical and chemical properties of NaY zeolites and liquid phase cerium ion exchanged Y zeolites (LCeY) were characterized by XRD, N₂ adsorption, NH3TPD, and insitu PyFTIR. The adsorption behavior of thiophene on NaY and LCeY zeolites was studied by using frequency response (FR) technique and intelligent gravimetric analyzer (IGA), and the different adsorption models of thiophene on Y zeolites modified by rare earth metal were investigated simultaneously. The results indicate that different mass transfer processes in the micropores of these zeolites can be validly identified by FR technique. The adsorption behavior of thiophene on NaY zeolites is relatively simple. Two mass transfer processes can be measured, containing channel adsorption and π electron interaction. While, the adsorption behavior of thiophene on LCeY zeolites is relatively complex. Except for two adsorption processes of adsorption in micropores and "SM" adsorption, complex catalytic reaction processes is also detected in LCeY zeolites under the condition of high temperature.

Key words: Thiophene,    ,  Frequency response,    , Rare earth ion,    ,  Y zeolite,    ,  Adsorption behavior

摘要： 以N a Y、 液相C e离子交换改性的Y型分子筛( L - C e Y) 为研究对象, 运用N2 吸附、 XR D、 NH3 - T P D和 P y - F T I R等实验方法表征两种 Y型分子筛的物化性能。采用频率响应技术( F R) 和智能重量分析仪( I GA) 研究噻吩 在两种分子筛上的吸附行为, 并考察噻吩在稀土离子改性 Y型分子筛上的不同吸附作用模式。结果表明, 频率响应 技术能够有效识别分子筛孔道内发生的不同传质过程。噻吩在 N a Y分子筛上的吸附行为较为简单, 存在孔道吸附 和π电子相互作用两种吸附过程; 而在L - C e Y分子筛上吸附行为较为复杂, 同时存在孔道吸附和“ S - M” 吸附等多种 吸附过程, 另外, 在高温条件下, 还存在复杂的催化反应过程。

关键词: 噻吩,  , 频率响应, 稀土离子, Y型分子筛, 吸附行为