纳米Ce/CuO的改性及室温脱硫性能

Desulfurization Performance of Modified Nano-Ce/CuO at Room Temperature

采用直接沉淀法制备出铁、钴和锌元素改性的纳米Ce/CuO脱硫剂,在室温常压条件下吸附含H2S恶臭气体,研究其脱硫活性。通过X射线衍射(XRD)仪、透射电子显微镜(TEM)、X射线光电子能谱(XPS)等技术分析了改性元素对纳米Ce/CuO脱硫剂结构的影响,探讨脱硫剂结构变化与脱硫性能的关系。结果表明,改性元素钴添加到纳米Ce/CuO脱硫剂中具有最好的脱硫活性,钴的添加使纳米Ce/CuO脱硫剂的粒径明显变小,材料中存在Cu^(3+),且Cu^(3+)/Cu^(2+)的摩尔比值要高于纳米CuO和Ce/CuO样品,说明Co/Ce/CuO表面对脱硫反应有利的氧空位增加;当Co添加量为4.9%时,Co/Ce/CuO脱硫剂的穿透时间可达525 min,比Ce/CuO脱硫剂的穿透时间延长了近300 min。

Nano-Ce/CuO desulfurizers modified by iron, cobalt and zinc were prepared by direct deposition precipitation, and the performance of the nanoparticles for H2 S desulfurization at ambient temperature was evaluated by the break-through tests. X-ray diffraction（XRD）, transmission electron microscopy（TEM）, X-ray photoelectron spectroscopy（XPS） and other characterization approaches were adopted to explore the relationship between structural changes and desulfurization performance. The results show that nano-Ce/CuO desulfurizer modified by cobalt has the best desulfurization activity, and Co addition decreases significantly the particle size, and increases the molar ratio of Cu^3＋/Cu^2＋, indicating more oxygen vacancies in the surface in favor of the desulfurization. When the addition amount of Co in Ce/Cu desulfurizer is 4.9%, Co/Ce/CuO exhibits the best desulfurization activity with a H2 S breakthrough time of 525 min, and the extension is nearly 300 min compared with that of Ce/CuO desulfurizer.