UiO-66-NH_(2)负载铜催化剂的制备及其对醇的催化氧化

Preparation of UiO⁃66⁃NH2 supported copper catalyst and its catalytic activity on alcohol oxidation

通过溶剂热法成功制备了一种基于金属有机骨架(MOF)的复合材料Cu-Cu_(2)O/UiO-66-NH_(2),采用傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)对材料进行全面表征。在空气作氧化剂条件下,以苯甲醇氧化为苯甲醛作为模型反应,系统地考察了溶剂、温度、催化剂各组分用量等因素对催化效果的影响。研究结果表明,该复合催化剂在醇选择性氧化反应中表现出优异的催化性能,60℃下反应5 h便可将苯甲醇定量转化为苯甲醛,并对其他苄基醇、烯丙基醇和杂芳基醇等底物也展现出良好活性。此外,循环利用3次后,该催化剂活性几乎不变,表明其具有良好的稳定性和重复使用性。

In this study,a composite of Cu-Cu_(2)O/UiO-66-NH_(2) based on a metal-organic framework(MOF)was suc-cessfully prepared by solvothermal method,and it was comprehensively characterized by Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microsco-py(TEM),and X-ray photoelectron spectroscopy(XPS).The effects of solvent,temperature,and catalyst loading on the oxidation of benzyl alcohol to benzaldehyde were investigated using air as an oxidant.The composite catalyst showed excellent catalytic performance,and benzyl alcohol could be quantitatively converted to benzaldehyde at 60℃for 5 h.Additionally,other alcohol substrates such as benzylic alcohols,allylic alcohols,and heteroaryl alco-hols,were selectively transformed into the corresponding aldehydes in excellent yields.Notably,the activity of the catalyst was almost unchanged after three cycles of recycling,demonstrating good stability and reusability.