镍钙铝复合氧化物对废碱液催化氧化脱硫性能的研究

Catalytic Oxidative Desulfurization of Waste Alkali Liquid with Nickel Calcium Aluminum Composite Oxides

摘要: 以过渡金属硫酸盐MSO₄ (M = Ni, Cu, Mn, Co)为催化剂活性组分，以钙铝水滑石为载体，通过浸渍法负载然后通过焙烧制得非均相负载型催化剂。分别对样品进行X射线衍射(XRD)，热重量分析(TG)和扫描电子显微镜(SEM)表征，分析催化剂的物相组成及其微观结构。在常温常压下，以空气为氧化剂，对含硫废碱液进行催化氧化脱硫性能的研究，分别筛选金属前驱体种类、载体含量、催化剂的添加量、催化剂焙烧、反应温度等因素对脱硫率的影响。结果表示以镍基为催化剂活性组分，钙铝水滑石为载体，通过浸渍法负载后经600℃焙烧5 h制得催化剂，负载比为3%。在鼓气量2.5 L/min，温度85℃条件下，处理初始硫离子浓度为6000 ppm，反应2 h脱硫率可达95%。催化剂重复反应12次以上，催化活性基本不变，具有很好的稳定性。

Abstract: A heterogeneous supported catalyst is prepared using transition metal sulfate MSO₄ as an active component and hydrocalumite as a carrier. The catalyst is loaded by impregnation and then cal-cined. An analysis of the phase composition and microstructure of the catalyst was conducted using X-ray diffraction (XRD), thermo gravimetric analysis (TG), and scanning electron micros-copy (SEM). The catalytic oxidative desulfurization performance of sulfur-containing waste al-kali liquid was evaluated at normal temperature and pressure, using air as the oxidant. The type of catalyst, the amount of catalyst addition, the roasting temperature of the catalyst, as well as other factors were screened for their effects on the desulfurization rate. A nickel sulfate catalyst is employed as an active component, and calcium-aluminum hydrotalcite serves as the carrier. The catalyst was prepared via the impregnation method, and it was then roasted for five hours at 600°C. The initial concentrations of sulfur ions were 6000 ppm, and the reduction rate reached 95% after two hours. It is noteworthy that the catalyst was able to repeat the reaction over 12 times with essentially unchanged catalytic activity.