Effect of Cu Loading to Catalytic Selective CO Oxidation of CuO/CeO₂–Co₃O₄

This work studied CuO/CeO2-Co3O4 with wt% Ce:Co ratio 95:5 for selective CO oxidation with effect of? wt% Cu loading. The catalysts were prepared by co-precipitation. Characterizations of catalysts were carried out by XRD and BET techniques. The results showed a good dispersion of CuO for 5 wt% Cu loading catalysts and showed high specific surface area of catalyst. For selective CO oxidation, both 5CuO and 30CuO catalysts could remove completely CO in the presence of excess hydrogen at 423 K and 20CuO could eliminate CO completely at 443 K. Moreover, considering the selectivity to CO oxidation, the 5CuO catalyst has shown the highest selectivity of 85% while the 30CuO catalyst obtains the selectivity of 65% at the reaction temperature of 423 K.

钴系氧化物载体磁性微球的制备和研究

磁性纳米材料因具有毒性小、催化作用强、分散性快、性质稳定等优异性能,因此在纳米材料科学领域被广泛应用,在新材料,能源,信息,生物医学等各个领域发挥举足轻重的作用。其中,钴系氧化物因其表面原子的占比较高,比表面积较大,故通常具有良好的表面效应,因而具有较高的负载能力。本研究采用液相沉淀法制备了Co3O4纳米颗粒,然后将L-酪氨(L-Tyrosine)通过化学键合的方式修饰到Co3O4纳米颗粒表面,得到了Co3O4@L-Tyrosine磁性纳米复合材料;采用了扫描电子显微镜、凝胶电泳、红外和紫外光谱分析等实验对其进行形貌和性能表征。实验结构表明,表面修饰L-Tyrosine的Co3O4纳米材料在核酸提取和染料降解方面具有显著的效果。