载体改性对CuO-ZnO/Al_2O_3催化剂结构及甘油氢解性能的影响  

Effect of Carrier Modification on the Structure and Hydrogenolysis Performance of CuO-ZnO/Al_2O_3 in Its Catalyzing Glycerol

作　　者：姚志龙[1,2] 闵恩泽 

机构地区：[1]北京石油化工学院,北京102617 [2]恩泽生物质精细化工北京市重点实验室,北京102617

出　　处：《精细化工》2013年第9期1021-1024,1030,共5页Fine Chemicals

摘　　要：以经氧化镁和氧化硼改性的氧化铝为载体,采用浸渍法制备了负载型CuO-ZnO/Al2O3催化剂,通过XRD、XPS、BET、TPR手段表征催化剂上CuO的分布和化学形态。结果表明,氧化硼的引入能够有效提高催化剂的比表面积,同时氧化硼既可以作为结构性助剂提高铜在催化剂表面上的分散度,又可以作为电子性助剂有利于催化剂表面缺电子态铜物种的稳定;氧化镁的引入有利于氧化铜在催化剂上的分散。经氧化硼改性的CuO-ZnO/Al2O3催化剂作用下甘油转化率可达100%,对1,2-丙二醇选择性达94%以上。CuO-ZnO/Al2O3 catalysts modified with magnesium oxide and boron oxide were prepared by impregnation. XRD, XPS, BET and TPR methods were used to characterize the distribution and chemical configuration of CuO impregnated on the catalyst. The results show that the surface area of catalysts increased with the introduction of boron oxide, and that boron oxide acted as structural promoter and electron promoter in CuO-ZnO/Al2O3 catalysts. Boron oxide could modify the interaction between copper oxide and the supporter, which is conducive to the dispersion of copper oxide and the stability of Cu species in defect of electron. The dispersion of copper oxide on the catalyst increased with the addition of magnesium oxide. With a weight loading of 6% of CuO in the catalyst which was modified with boron oxide,the conversion rate of glycerol was up to 100% ,whereas the selectivity for 1,2-propanediol was over 94%.

关 键 词：甘油 氢解 氧化镁 氧化硼 催化技术 

分 类 号：TQ426.83[化学工程] TQ223.163