Alkylation of Naphthalene with Propylene Catalyzed by Aluminum Chloride Immobilized on Al-MCM-41

AlCl3 catalysts immobilized on mesoporous Al-MCM-41 were prepared by a two step vapor method and their catalytic performance was evaluated for the alkylation of naphthalene with propylene in a slurry bubble column reactor. The physico-chemical properties of the supports and catalysts were characterized by X-ray diffraction, N2 adsorption, and pyridine adsorption infrared spectroscopy. The halide loadings of the catalysts were analyzed by a chemical method. For the alkylation of naphthalene with propylene over AlCl3/Al-MCM-41, pore diameters that match the molecular dimensions of 2,6-diisopropylnaphthalene (2,6-DIPN) and an appropriate amount of [–O–AlCl2] in the catalyst are key to controlling activity and selectivity. The AlCl3 catalyst immobilized on mesoporous H/Al-MCM-41 with a Si/Al ratio of 15 exhibited high activity when the alkylation was carried out at 0.1 MPa and 85 °C for 5 h. A naphthalene conversion of 82.1% and a 2,6-DIPN selectivity of 32.2% were obtained.

摘 要采用两步气相法制备了 AlCl3/Al-MCM-41 催化剂, 在浆态鼓泡床反应器中考察了其催化萘和丙烯烷基化反应性能, 并通过粉末 X 射线衍射、N2 吸附-脱附、吸附吡啶红外光谱及化学分析等方法, 表征了载体的物化性质及催化剂表面酸性. 结果表明, 在萘与丙烯的烷基化反应中, 具有与 2,6-二异丙基萘 (2,6-DIPN) 分子动力学尺寸相匹配的孔道和适当的[–O–AlCl2]担载量是提高 AlCl3/Al-MCM-41 催化剂活性和选择性的关键, 其中以较大孔径的 AlCl3/H/Al-MCM-41 催化剂活性最高, 在 0.1 MPa, 85 oC 反应 5 h 时, 萘转化率达 82.1%, 2,6-DIPN 在 DIPN 中的摩尔含量达 32.2%. 

Alkylation of naphthalene with propylene can be carried out over AlCl3/Al-MCM-41 catalysts in a slurry bubble column reactor at 85 °C. The pore diameter influences the conversion of naphthalene and selectivity for 2,6-diisopropylnaphthalene.Figure optionsDownload as PowerPoint slide