大比表面积氮化钴钼催化剂的制备和加氢性能

以Ｎ２－Ｈ２为氮化与与钴钼氧化物进行程序升温反应制备了大比表面积的钴钼氮的化物。研究结果表明,随着钴含量的增加,产物的比表面积有所减少,但比以ＮＨ３为氮化气制备的产物的比表面积大很多。本方法所用制备条件也较缓和。以二苯并噻吩为模化合物评价了钴钼氮化物的加氢脱硫性能。     

Amorphous forming ability of Co-X （X=Cr, Mo, W） magnetic thin films

Co-X(X=Cr, Mo, W) magnetic thin films were prepared by using DC magnetron sputtering, and their structures were examined by using X-ray diffraction (XRD). The amorphous forming ability (AFA) of the three alloy systems was discussed based on thermodynamic calculation and experiments. The results show that the Co-Mo thin films exhibit the largest AFA among them, and the Co-W thin films are condition-dependent amorphous while the Co-Cr thin films are hard to be amorphous, which is consistent with the thermodynamic calculation. The difference in AFA for the alloys of these three systems is finally ascribed to three main factors: differences in electronegativity, electron density and atomic size between Co and X elements.     

东昆仑索拉吉尔铜钼矿床成矿系统及开发条件

东昆仑索拉吉尔铜钼矿床是近年新发现的一个矿床,其特征为含矿热液沿构造贯入矽卡岩和大理岩地层中成矿。笔者总结了索拉吉尔铜钼矿的成矿系统,认为昆北早古生代中期（奥陶-志留纪）弧后裂陷,热水沉积了滩间山群岩系,成为初始矿源层,印支期岩浆活动为该区带来了强大的热动力条件,热液交代作用重塑了层矽卡岩。成矿元素沿构造薄弱的破碎矽卡岩以及大理岩中发生矿化富集,叠加成矿。论文对该成矿带的开发进行了探讨,论述了在肯德可克建设矿城的充要条件。      

CFD modeling and experimental study of multi-walled carbon nanotubes production by fluidized bed catalytic chemical vapor deposition

A parametric study investigating the impact of temperature, gas velocity, and composition of the gaseous phase on the catalytic growth of multi-walled carbon nanotubes (CNT) has been performed. CNTs have been produced by catalytic chemical vapor deposition from methane decomposition over Co-Mo/MgO with average diameter of 188 μm with spherical shape in a fluidized bed reactor. The computational fluid dynamics (CFD) method was used for simulating the hydrodynamics of the reactor and investigating the operational and best velocity for producing high quality CNTs by this system. The operational and best velocities obtained by simulation were 0.015 to 0.05 m/s and near 0.015 m/s. Then the results used in the experiments with different temperature and gas compositions. CNTs products were characterized by Raman spectroscopy, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The results showed that temperature of 900 °C, methane to hydrogen volume ratio 1:4 and 0.02 m/s are the best quantities of the parameters for CNTs growth.     

FBK型Co-Mo/MgAl_2O_4高压CO耐硫变换催化剂工业侧线试验

以制备的具有高比表面积Mg Al2O4为载体,采用等体积浸渍法,工业生产新型高效FBK型Co-Mo/Mg Al2O4高压CO耐硫变换催化剂。在福建三钢(集团)三明化工有限责任公司变换工段100 L侧线装置上开展近四个月的催化剂工业试验研究。结果表明,催化剂运行过程易调节和控制,催化剂活性和热稳定性优异,低汽气比条件下不发生副反应,出口CO浓度完全满足生产要求。使用过程中催化剂无粉化,无结块,机械强度高,抗水合性能优越,适应宽汽气体积比(约0.4~2.0)条件,节能效果显著,具有很好的工业应用前景。