浸渍方法对Cs/HX分子筛催化剂碱性及其催化甲苯甲醇烷基化反应性能的影响

采用直接浸渍、真空浸渍、超声波浸渍3种方法制备了一系列不同的碱性分子筛催化剂Cs/HX，并应用于甲苯甲醇烷基化催化反应，同时采用XRD、NH₃-TPD、CO₂-TPD、BET、AAS和Py-IR表征考察了浸渍方法对Cs/HX催化剂酸碱性及烷基化反应性能的影响。结果表明，采用3种浸渍方法所制得的Cs/HX分子筛催化剂的Cs₂O负载量不同，分子筛孔道结构和酸碱性也存在明显差异。采用直接浸渍法制备的Cs/HX碱性较强，B酸中心的量更少，因此其催化甲苯甲醇侧链烷基化反应的苯乙烯选择性较高，并具有较高的催化反应活性。

Influences of Impregnation Method on the Basicity of Cs/HX and Its Catalytic Performance in Alkylation of Toluene With Methanol

 A series of base zeolite catalysts Cs/HX were prepared，respectively，by direct impregnation，vacuum impregnation and ultrasonic impregnation methods， which were used as the catalyst for alkylation of toluene with methanol. The physico-chemical properties of prepared Cs/HX samples were characterized by XRD，NH₃-TPD，CO₂-TPD，BET，AAS and Py-IR. The results indicated that the loading amounts of Cs₂O on Cs/HX prepared with different impregnation methods were varied， and there was also the obvious difference in their basicity properties and the pore structure. The Cs/HX prepared by direct impregnation possessed the strongest basicity and lest Brönsted acidic sites among the three Cs/HX prepared by different impregnation methods， and thus showed the high selectivity of styrene and the high reactivity in the catalytic side-chain alkylation of toluene with methanol.