火柴棒状纳米碳管的制备及其生长机理

以钨酸钠为钨源,氯化钠为诱导剂,通过水热法制备了三氧化钨(WO₃)纳米棒,再以葡萄糖为碳源,经再次水热反应对WO₃表面进行碳包覆,然后在氢气和甲烷混合气氛中反应一段时间获得了具有火柴棒状结构的纳米碳管。采用X射线衍射分析、场发射扫描电子显微镜、透射电子显微镜和X射线能量散射谱等手段对样品的晶型、形貌、微结构和表面化学元素进行了表征与分析。结果表明,样品由纳米碳管和碳化钨(WC)构成。其中,纳米碳管为火柴棒状,长度0.5～1.0 μm,直径100 nm左右;WC颗粒位于纳米碳管内部,其大小决定了火柴棒状纳米碳管的内径。这充分说明WC在碳管的生长过程中充当催化剂的作用。     

碳化钨和天然沸石复合材料在水溶液中的电催化活性(英文)

Tungsten carbide and zeolite nanocomposite was prepared by combining a mechanochemical approach with a reduction and carbonization approach,using natural zeolite and ammonia metatungstate as precursors.The sample was characterized by X-ray diffraction and scanning electron microscope.The results showed that the crystal phase of the sample is composed of zeolite,monotungsten carbide and bitungsten carbide.The mass percentage and the crystallite diameter of tungsten carbide change along with the reacted time.Its electrocatalytic activity was measured with a microelectrode system with three electrodes.The results show that its electrocatalytic property is related to its crystal phase and the mass percentage of tungsten carbide,and its electrocatalytic activity is connected with the property of electrolyte,in which it is measured.Synergistic effect between tungsten carbide and zeolite is found during electrocatalysis.     

电渗析脱除热稳定盐技术在天然气净化厂的应用

采用电渗析技术对普光天然气净化厂730 m~3 N-甲基二乙醇胺(MDEA)溶液中热稳定盐(HSS)的脱除进行应用分析。结果表明:在200对均相膜片、电压100V的操作条件下,MDEA溶液中热稳定盐的质量分数由3%降至0.5%;Cl~-质量浓度由1 300mg/L降至200mg/L;Na~+质量浓度由4 200mg/L降至700mg/L;MDEA质量分数由41.47%降至40.42%。此外,电渗析脱盐技术具有高效、环保、无需酸液和碱液再生等优点,为MDEA溶液的净化提供了新的技术路线。     

废MDEA溶液资源化回收利用研究

采用管式膜过滤技术与电渗析脱盐技术,对200 m~3的废MDEA溶液进行再生回收研究,以期解决废MDEA溶液的资源化回收利用问题。结果表明,废MDEA溶液悬浮物质量浓度由194 mg/L降至3 mg/L时,去除效率达到98.5%,热稳定盐质量分数由3.2%降至0.7%,废MDEA质量分数由18.7%提高到19.1%;该管式膜过滤与电渗析脱盐技术为废MDEA溶液的资源化回收利用提供了一种新的技术路线。