不同方法制备ZSM-11分子筛催化剂上乙醇和苯气相烷基化制乙苯

采用固定床反应器考察了在一定温度水热处理后无黏结剂、Al2O3和SiO2黏结剂成型制备的强酸量相近ZSM 11分子筛催化剂催化乙醇和苯气相烷基化反应性能。采用X射线衍射（XRD）、 N2 物理吸附 脱附、氨程序升温脱附（NH3 TPD）、吡啶吸附红外（Py IR）和热重分析（TG）等技术手段对ZSM 11分子筛样品进行了表征。结果表明，Al2O3和SiO2成型的ZSM 11催化剂（Cat A、Cat B）的微孔体积相近，无黏结剂ZSM 11分子筛催化剂（Cat C）的BET比表面积最小，微孔体积最大；与Cat A和Cat B相比，Cat C的强酸中Brnsted酸/Lewis酸酸量比最高。在乙醇和苯气相烷基化反应中，乙醇未完全转化的情况下，Cat A上苯和乙醇转化率最高。还考察了Cat A分子筛催化剂上气相烷基化反应寿命，在500 h的反应过程中，乙醇转化率可达999%, 苯的转化率维持在12%, 产物中烃类液体选择性达到98%~99%。

Gas Alkylation of Ethanol With Benzene Over ZSM-11 Zeolite Catalysts Synthesized via Different Preparation Methods

Gas alkylation performances of the ZSM 11 zeolite catalysts of similar strong acidity prepared via different methods, were investigated in a fixed bed reactor. The samples were characterized by X ray diffraction (XRD), N2 physisorption desorption, ammonia temperature desorption process (NH3 TPD), pyridine adsorption infrared (Py IR) and thermogravimetric analysis (TG) methods. The ZSM 11 catalysts referred to as Cat A and Cat B with alumina and silica as binder, respectively, have similar micropore volume. While the none binder ZSM 11 zeolite catalyst (Cat C) shows the lowest BET specific surface area and largest micropore volume. In comparison with Cat A and Cat B, Cat C possesses the highest molar ratio of strong Brnsted acid concentration /Lewis acid concentration. When the catalysts are used in the gas alkylation of ethanol with benzene, Cat A exhibited the highest benzene and ethanol conversion, with ethanol conversion less 100%. Furthermore, the lifetime test of Cat A in the gas alkylation was investigated. During the 500 h processing, ethanol conversion is 999%, benzene conversion remains 12%, and the hydrocarbon liquid product selectivity is around 98%-99%.