膨胀石墨负载CuO_x催化剂的制备及其性能

Preparation and properties of expanded graphite supported CuO_x catalyst

制备一系列膨胀石墨(EG)和鳞片石墨(FG)负载CuOx催化剂(Cu/EG1,Cu/EG2和Cu/FG),并用于催化分子氧氧化环己烯反应。通过扫描电子显微镜(SEM)、能谱分析(EDS)、N2物理吸附、X线衍射(XRD)、红外光谱(FT-IR)和电感耦合等离子体发射光谱(ICP)等手段对催化剂进行表征。研究结果表明:环己烯转化率达70%以上,2-环己烯-1-酮为主要产物,其选择性可达61.8%;Cu/EG1的催化活性明显比Cu/FG的优,且Cu/EG1在重复使用3次后仍能表现较强的催化活性;采用化学氧化法制备Cu/EG1,一方面可显著增大载体的比表面积,另一方面能为载体引入特定官能团和少量Mn和Fe,增加多元活性中心,从而提高Cu/EG1的催化活性。

Copper catalysts supported on EG or FG（Cu/EG1,Cu/EG2 and Cu/FG） were prepared and utilized in the selective aerobic oxidation of cyclohexene.These catalysts were further characterized by scanning electronic microscopy（SEM） and energy dispersive spectrometer（EDS）,N2 adsorption-desorption,X-ray diffraction（XRD） and compiled plasma spectrometer（ICP）.The results show that over 70% cyclohexene is converted and 2-cyclohexene-1-one is the main product with the selectivity up to 61.8%,and Cu/EG1 has much higher catalytic activity than that of Cu/FG.Cu/EG1 still has high catalytic activity even after being re-used for 3 times.The surface area of the carrier significantly increases through chemical oxidation.Besides,a small amount of Fe,Mn and some specific functional groups are carried into EG1,which increases the amount of surface active sites and enhances the catalytic activity.