Abstract: The reaction activities of ZSM - 5 and 7 - A12O3 for disproportionation of toluene under supercritical conditions was investigated. The experiments for 7 - A12O3 disclosed that coke deposition on the catalyst was inhibited and the activity of 7 - A12O3 was maintained constant under the supercritical conditions. The results of the runs on ZSM - 5 indicated that coke formation could not be prevented and thus the activity could not be maintained under supercritical conditions. The mechanism of prevention of coke formation was discussed.

摘要： <正> 1 引言 超临界流体中的化学反应过程具有许多潜在的优势,是近年来十分活跃的研究领域.超临界流体中进行化学反应可以原位维持非均相催化剂的活性,这方面的工作只见简单模型反应的实验报道,缺乏对有关机理的探索。目前工业上甲苯歧化为临氢操作以改善催化剂的稳定性,延长寿命。本实验研究的目的是利用超临界流体的特点,探索不临氢超临界条件下,改善催化剂稳定性,延长寿命,开发甲苯歧化新工艺的可能性。为此,本文对超临界甲苯(T_c=597.1K,P_c=4.23MPa)在ZSM-5和丁-Al_2O_3上歧化反应的催化剂活性进行了实验研究,并对有关机理进行了讨论。