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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (12): 1151-1154. 上一篇    

研究简报

介孔结构空心球状WC粉体催化剂的制备与表征

马淳安*abcd，张维民ac，李国华abc，郑遗凡ac，周邦新d，成旦红d   

  1. (1绿色化学合成技术国家重点实验室培育基地 2纳米科学与技术工程研究中心
    3浙江工业大学化学工程与材料学院 杭州 310014)
    (4上海大学材料科学工程学院 上海 200072)
  • 投稿日期:2004-11-05 修回日期:2005-02-28 发布日期:2010-12-10
  • 通讯作者: 马淳安

Preparation of Hollow Global Tungsten Carbide (WC) Catalysts with meso-Porosity and Its Characterization

MA Chun-An*abcd, ZHANG Wei-Ming1,3, LI Guo-Huaabc, ZHENG Yi-Fan1,3
ZHOU Bang-Xin4, CHENG Dan-Hong4   

  1. (1 Breeding Base of State Key Laboratory of Green Chemistry-Synthesis Technology, 2 Research Center of Nano Science and Technology, 3 School of Chemical Engineering and Material Science, Zhejiang University of Technology, Hangzhou 310014)
    (4 School of Materials Science and Engineering, Shanghai University, Shanghai 200072)
  • Received:2004-11-05 Revised:2005-02-28 Published:2010-12-10
  • Contact: MA Chun-An

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以偏钨酸铵为钨源, CO为还原性气体和碳源, 采用喷雾干燥微球化处理—气固反应法制备了具有介孔结构空心球状的WC粉体. 采用XRD, SEM, EDS和TG-DTA等分析手段对样品的形貌、物相组成、化学成分以及在空气中的热稳定性进行了表征. 结果表明, 碳化钨粉体为缺碳含氧的WC相, 化学成分为W, C, O, W与C的原子比接近1∶1; 碳化钨颗粒为分散性良好的空心球状, 表面具有介孔结构; TG-DTA曲线表明, 样品在空气中具有良好的热稳定性.

关键词: 介孔, 空心球状, 碳化钨, 表征

Hollow global tungsten carbide (WC) catalysts with meso-porosity were prepared by spray drying sphere miniaturation-gas-solid reaction, using ammonium metatungstate as precursors, carbon monoxide as deoxidizing gas and carbon dioxide as carrier gas. The samples were characterized by XRD, SEM, EDS and TG-DTA, respectively. XRD and EDS results show that the sample took pure WC phase, with a ratio of W/C near 1. TG-DTA results show that the sample is stable in the air under 400 ℃. SEM images indicate that the morphology of the sample is hollow globe with meso-porosity on the surface. The hollow globe was constituted by a lot of puncheons, with a length of 100～800 nm and a width of 50～150 nm. The joint between two puncheons lies on tips or tip and the surface of puncheon. Puncheons were surrounded by cavities. The cavity connects with each other, with different shapes and a size of 0～200 nm.

Key words: meso-porosity, hollow globe, tungsten carbide, characterization