铜掺杂钙铝水滑石催化氧化异丙苯制备异丙苯过氧化氢

采用共沉淀法制备了铜掺杂钙铝水滑石Ca₄Cu _x Al-LDHs（x=0，0.1，0.3，0.5，0.8，1.0），并对其催化异丙苯液相氧化制备异丙苯过氧化氢的活性进行了研究。采用X射线衍射、傅里叶红外光谱、扫描电子显微镜和热分析等手段对Ca₄Cu _x Al-LDHs进行了表征，制备的Ca₄Cu _x Al-LDHs保留了水滑石的片层状结构，铜的掺杂使孔径变小，比表面积增大。当进料比（催化剂/异丙苯）为7.5 mg/mL，反应温度85 ℃，氧气流速为15 mL/min，反应时间7 h，异丙苯的转化率为34.5%，异丙苯过氧化氢的选择性为86.9%，催化剂循环使用5次后，异丙苯的转化率为31.2%，异丙苯过氧化氢的选择性为83.3%。研究为异丙苯过氧化氢开发了新的催化体系。

Catalytic Performance of Cu?Doped Calcium Aluminum Layered Double Hydrotalcites for the Oxidation of Cumene to Cumene Hydrogen Peroxide

Cu-doped calcium aluminum hydrotalcites of Ca₄Cu _x Al-LDHs （x=0， 0.1， 0.3， 0.5， 0.8，1.0） were prepared by a coprecipitation method， and its catalytic activity for liquid phase oxidation of cumene to cumene hydroperoxide （CHP） was investigated. Ca₄Cu _x Al-LDHs were characterized by X-ray diffraction， Fourier transform infrared spectroscopy， scanning electron microscope and thermal analysis. The prepared Ca₄Cu _x Al-LDHs remain the layered structure of hydrotalcite. The copper doping results in a smaller pore size and a larger specific surface area. When the feed ratio （catalyst/cumene） is 7.5 mg/mL， the reaction temperature is 85 ℃， the flow rate of oxygen is 15 mL/min， and the reaction time is 7 h， Ca₄Cu_0.5Al-LDHs shows excellent catalytic activity， the conversion of cumene is 34.5% and the selectivity of CHP is 86.9%. After being used for five cycles， the conversion of cumene is 31.2% and the selectivity of CHP is 83.3%. The study is useful for developing the production method for cumene hydrogen peroxide.