Abstract: A series of Fe/ZSM-5 zeolites with different contents of Fe were hydrothermally synthesized by changing the Si/Fe ratio (the same gel of SiO2/Al2O3=100) and their catalytic performance for toluene alkylation with methanol was investigated in a continuous fluid fixed bed reactor at normal atmosphere. The structure, pore properties and acidity of Fe/ZSM-5 zeolites were characterized by X-ray diffraction, electronic paramagnet resonance, low temperature N2 adsorption, NH3-TPD and Py-IR. The results indicate that the partial introduction of Fe atoms into the zeolite frameworks in the synthetic process does not destroy the ZSM-5 framework structure, while it leads to the decrease in crystallization capacity, the change in acidity and the lowering in the acid strength. As a result, the coke formation during the alkylation reaction process is suppressed. Hence, the stability of zeolite and the utilization ratio of methanol are improved.

摘要： 采用水热晶化的方法，通过改变凝胶Si/Fe比例合成了一系列不同铁含量的Fe/ZSM-5分子筛（凝胶投料硅铝比为100）。在常压连续流动固定床反应器上，考察了Fe/ZSM-5分子筛用于催化甲苯甲醇烷基化的反应行为。采用X射线衍射、电子顺磁共振、N2物理吸附、氨程序升温脱附及吡啶吸附红外光谱等方法研究了Fe/ZSM-5分子筛的结构及孔结构性质和酸性。实验结果表明，在合成过程中引入铁原子，使部分铁原子进入分子筛骨架，并没有破坏ZSM-5分子筛的骨架结构，但降低了分子筛结晶度，改变了分子筛酸性质，降低了分子筛酸强度；Fe/ZSM-5抑制了积炭的形成，分子筛稳定性以及甲醇烷基化利用率得到明显提高。