尿素磷酸盐饲料添加剂的生产工艺研究和应用

论述了尿素磷酸盐作为反刍动物新型饲料添加剂的饲效及国内外开发利用情况，对其性质和物性数据做了阐述；探索了生产工艺路线和最佳工艺条件，介绍了饲用效果。     

化学清洗技术在工厂的应用——一项企业节能增效的新技术

简要地介绍了化学清洗的分类及清洗方案的制定以实例论述了化学清洗技术在工厂的应用效果，实践说明了化学清洗技术是一项非常有效的企业节能增效新技术     

Hydrogen storage thermodynamics and kinetics of as-cast Ce-Mg-Ni-based alloy

The reaction kinetics of alloys based on magnesium are known to be greatly improved by the partial substitution of Mg with rare earths and transition metals,particularly Ni.The enhanced superficial hydrogen dissociation rate,the weakened Mg-H bond and the lower activation energy following element replacement are thought to be related to the better performance.The experimental alloys Ce5Mg95-xNix(x=5,10,15)were smelted by the vacuum induction melting.The phase transformation and structural evolution of experimental alloys before and after reaction with hydrogen were char-acterized by X-ray diffraction,scanning electron microscopy and transmission electron microscopy.The cast specimens contain CeMg12,Mg and Mg2Ni phases,and the increase in Ni content results in an obvious growth of Mg2Ni phase.The isothermal and non-isothermal hydrogenation and dehydrogenation kinetics of the experimental specimens were investi-gated using the Sievert apparatus,differential scanning calorimetry and thermal gravimetric analyzer.The activation energy may be calculated using the Arrhenius and Kissinger equations.The experimental alloys have been shown to have good activation properties,with a reversible hydriding and dehydriding capacities of around 5.0 wt.％in the first cycle.The initial dehydrogenation temperature of MgH2 decreases from 557.5 to 537.7 K with changing Ni content from 5 to 15 at.％.The dehydrogenation activation energy also reduces from 77.09 to 62.96 kJ/mol,which explains the improved hydrogen storage performance caused by Ni substitution.It can be shown that the impact of Ni on the decomposition enthalpy of MgH2 is quite modest,with the absolute enthalpy(ΔHr)only decreasing from 78.48 to 76.15 kJ/mol.