【作者】 胡悦； 周洁； 杨小俊；

【Author】 Yue Hu;Jie Zhou;Xiaojun Yang;Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology;

【机构】 武汉工程大学化工与制药学院绿色化工过程教育部重点实验室；

【摘要】 在负载型钯催化剂制备过程中引入分散剂PVA和PVP,通过XRD,TEM,XPS,H₂-TPR等催化剂表征技术研究了经分散剂处理后的Pd/Pb-OMS-2催化剂在苯酚氧化羰基化合成碳酸二苯酯（DPC）中的催化性能。结果显示,分散剂的加入对Pb_2-xMn₈O₁₆的结构没有影响,但是对表面Pd物种的分散性和落位及Pb-OMS-2表面氧物种的性质产生明显影响。相比于PVP和无分散剂处理,PVA能使Pd分散均匀且较好的分散在Pb-OMS-2载体表面,并使还原后的Pd充分氧化,其处理后的Pb-OMS-2的表面氧物种更容易迁移,更有利于催化剂活性的提高,连续催化反应24h后碳酸二苯酯（DPC）的收率能达到55.2%。更多还原

【Abstract】 Pd/Pb-OMS-2 catalysts were treated by PVA and PVP and characterized by X-ray diffraction（XRD）, transmission electron microscopy（TEM）, X-ray photoelectron spectroscopy（XPS）, hydrogen temperature programmed reduction（H₂-TPR）. XRD results showed that the dispersant has no effect on the structure of the Pb_2-xMn₈O₁₆（Pb-OMS-2）. TEM and H₂-TPR results indicated that the dispersion of the Pd species on the surface and the migration ability of oxygen species on the surface were significantly influenced by the dispersant. XPS results showed that dispersant can affect the size of palladium nanoparticles and be helpful to the oxidation of Pd. The DPC yield of PVA-catalyst can reach 55.2% after 24 h reaction.更多还原