UiO-66-NH2接枝吡啶亚胺钴系催化剂的合成及催化乙烯齐聚性能

以金属有机骨架(MOFs)UiO-66-NH2和吡啶-2-甲醛为原料,采用后合成修饰法制备一种UiO-66-NH2接枝吡啶亚胺配体,然后以UiO-66-NH2接枝吡啶亚胺配体和CoCl2·6H2O为原料,经配合反应,合成出一种UiO-66-NH2接枝吡啶亚胺钴系催化剂.采用傅里叶红外变换光谱(FT-IR)、X射线衍射(...

Synthesis of UiO-66-NH2 Grafted Pyridineimine Cobalt Catalyst and Its Catalytic Performance in Ethylene Oligomerization

UiO-66-NH₂grafted pyridineimine ligand was prepared by post synthetic modification with metal organic frameworks(MOFs)UiO-66-NH₂and 2-pyridinecarboxaldehyde as raw materials,and then a novel UiO-66-NH₂grafted pyridineimine cobalt catalyst was synthesized by complexation reaction with UiO-66-NH₂grafted pyridineimine ligand and CoCl₂·6 H₂O as raw materials.The structure of the products was characterized by Fourier transform infrared spectroscopy,X-ray diffraction,scanning electron microscope,inductively coupled plasma mass spectrometry and nitrogen adsorption-desorption,and the catalytic performance of the UiO-66-NH₂grafted pyridineimine cobalt catalyst in ethylene oligomerization was investigated.The results show that the reaction temperature,Al/Co molar ratio and ethylene pressure have a significant effect on the catalytic activity and products selectivity.The catalytic activity of 1.23×10⁵g/(mol_Co·h)and 88.96% selectivity of butene are obtained under the condition of the reaction temperature 25℃,Al/Co molar ratio of 1000 and ethylene pressure of 1.0 MPa.