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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。
The supported CuO-ZnO / Al2O3 catalysts were prepared by impregnation method using alumina modified by magnesia and boron oxide as support. The distribution and chemical form of CuO on the catalyst were characterized by XRD, XPS, BET and TPR. The results show that the introduction of boron oxide can effectively improve the specific surface area of the catalyst. Meanwhile, boron oxide can be used as a structural promoter to improve the dispersion of copper on the catalyst surface, and can also be used as an electron assistant to facilitate the removal of electron-deficient copper on the catalyst surface Species stability; the introduction of magnesia is conducive to the dispersion of copper oxide on the catalyst. The conversion of glycerol up to 100% and the selectivity to 1,2-propanediol over CuO-ZnO / Al2O3 over boron oxide were over 94%.