Preparation and High-Temperature Water-Gas Shift Catalytic Features of La1-xCexFeO3 Perovskite

Based on water-gas shift reaction mechanism and perovskite compounds characteristics, La1-xCexFeO3(.K) perovskite were designed and prepared as shift catalysts. DTA and XRD results reveal that La1-xCexFeO3 can be formed at 730-760℃ by mechanic-mix thermal decomposition method. Activity and heat-resisting tests show that La1-xCexFeO3 (.K) possess high thermal stability if x is less than or equals to 0.5. But when x is greater than 0.5, La1-xCexFeO3 (.K) will be converted into ceria and magnetite partially or completely under shift reaction conditions. In the case of x=0.5, the conversion of CO is about 68% at 530℃. Potassium can greatly improve the low temperature activity, but slightly reduces the high temperature activity, and has little impact on the thermal stability. La0.5Ce0.5FeO3(.K) is a promising chromium-free high temperature shift catalyst.     

Phase formation with NaZn13 structure in metamagnetic La(Fe1-xCox)11.9Si1.1 compounds

The effects of different annealing conditions on the phase formation with NaZn13 structure were investigated in La(Fe1-xCox)11.9Si1.1(x=0.068) compounds. It was found that the 1:13 phase was not formed directly from the melt upon cooling but via a peritectic reaction between the pro-peritectic γ-Fe and the La-rich phase. Annealing temperature was very important for the formation of 1:13 phase. Ice water was confirmed to be a preferable quenching medium. La(Fe1-xCox)11.9Si1.1(x=0.068) compounds with almost single 1:13 phase were obtained at 1473 K after 15 d.     

Fe-Al金属间化合物粉末材料制备工艺研究

介绍了粉末Ｆｅ－Ａｌ金属间化合物制备的工艺过程,通过球磨机械合金化并结合热处理制备了Ｆｅ－Ａｌ金属间化合物为主要成分的粉末材料。     

机械合金化制备金属难熔化合物

在介绍机械合金化特点的同时，重点研究和讨论了机械合金化制备金属难熔化合物的过程及机理，并认为机械合金化是制备难熔化合物及其材料的一种行之有效的方法。     

应用比较分子力场分析法研究氯代苯酚化合物结构与活性的相关性

苯酚是一类对水生生物有严重危害作用的工业化合物。通过比较分子力场分析(CoMFA)法建立标题化合物对发光菌和浮萍活性的三维定量结构-活性关系(3D-QSAR)模型。其中,对发光菌的研究结果为:交叉验证系数q2=0．921,传统的相关系数(非交叉验证系数)R2=0．990。对浮萍的研究结果为:交叉验证系数q2=0．931,传统的相关系数(非交叉验证系数)R2= 0．995。取得优于文献的结果。     

含锆超高强铝合金的研究及发展概况

近年来，含锆超高强铝合金蓬勃发展，获得了广泛的应用，回顾了含锆超高强铝合金的历史及发展过程，重点讨论了锆元素在合金中的形式及作用机理，并就当前工作的重点及研究方向提出了一些看法及建议。     

Investigation of Potassium Storage in Layered P3‐Type K0.5MnO2 Cathode

Novel and low‐cost batteries are of considerable interest for application in large‐scale energy storage systems, for which the cost per cycle becomes critical. Here, this study proposes K_0.5MnO₂ as a potential cathode material for K‐ion batteries as an alternative to Li technology. K_0.5MnO₂ has a P3‐type layered structure and delivers a reversible specific capacity of ≈100 mAh g^?1 with good capacity retention. In situ X‐ray diffraction analysis reveals that the material undergoes a reversible phase transition upon K extraction and insertion. In addition, first‐principles calculations indicate that this phase transition is driven by the relative phase stability of different oxygen stackings with respect to the K content.     

A π-extended tetrathiafulvene derivative: Synthesis and photoluminescence properties

Solid-state emissive organic materials have received increasing attention due to their prospective applications in large-area. Here, a novel π-extended tetrathiafulvene derivative DPD with donor-π-donor structure has been newly developed to produce the prominent characteristic of aggregation-induced enhanced emission (AIEE) that exhibits higher fluorescence quantum efficiency in solid film compare to its solutions. The AIEE mechanism of DPD was studied in detail through photophysical investigations and can be dominant attributed to the formed excimer state of DPD and J-aggregates in solid state.     

石墨层间化合物GICs的形成机理探讨

将ＧＩＣｓ形成过程划分为熔融、活化、扩散和成键等阶段,分析了各阶段反应的主要影响因素,以氯化铜、氯化镍、ＧＩＣｓ的合成实验为基础,根据ＳＥＭ对石墨膨胀前后,插层后的形貌分析,以及膨胀石墨合成ＧＩＣｓ反应前后体积变化分析,认为ＧＩＣｓ的形成过程中,主要有三个机制起作用：     

ZnCl2-assisted Synthesis of ZnSe Polycrystal

A chemical-assisted element direct-reaction method is developed to synthesize ZnSe compound semiconductor material at a relatively low temperature (～1000 C). ZnSe polycrystal was obtained in the closed-tube systems with Zn-Se, Zn-Se-Zn(NH3)2Cl2, Zn-Se-NH4Cl and Zn-Se-ZnCl2. The as-synthesized samples were tested by X-ray diffraction (XRD), thermogravimetric analysis (TGA) and analyzed by thermodynamic numerical method. The results demonstrate that the synthesis efficiency is higher than 99.96% for Zn-Se-ZnCl2 system at around 1000 C for 3 weeks. It also exhibits that not only temperature, but also low apparent ratio of volume and surface area of the source materials and higher ZnCl2 content are required to achieve high synthesis efficiency. A SeCl transporting reaction synthesis process is proposed based on the thermodynamic analysis.