过渡金属改性Pd/C催化剂上葡萄糖催化氧化反应

Study on Catalytic oxidation of Glucose over the Pd /C Catalysts Modified by Transition Metals

考察了Fe、Co、Ni改性的Pd/C催化剂上葡萄糖催化氧化反应结果,利用BET、XPS研究了Co的添加及制备条件对催化剂物化性能的影响。活性评价结果表明,Co质量分数为3%的Pd Co/C催化剂显示出良好的催化性能,反应3h后,葡萄糖的转化率达92%,选择性为94%,较Pd/C催化剂的活性和选择性有显著的提高。BET、XPS表征结果表明,Co的添加及焙烧过程,改变了Pd/C催化剂的表面组成及结构,有利于Pd的还原,从而使Pd Co/C催化剂表现出良好的催化活性和选择性。

The activities of Pd/C catalysts modified by different transition metals such as Fe, Co and Ni were evaluated in a batch reactor, and Pd/C and PdCo/C catalysts were characterized by BET and XPS The results show the PdCo/C catalyst exhibits the high glucose conversion activity of 92 %, with 94 % selectivity to glucose acid, after the reaction running 3 h The BET measurement reveals that the increased distribution of the larger pore size of PdCo/C, resulting from the addition of Co and the sequent catalyst calcinations, leads to the decrease of the feedstocks transmit resistance The XPS characterization indicates that there are higher concentration and dispersion of palladium species on the surface of CoPd/C in comparison with Pd/C This suggests that the Pd species on the surface of CoPd/C catalysts can be reduced easily Thus, PdCo/C catalyst exhibits better catalytic activity for glucose catalytic oxidation than Pd/C catalyst