• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Powder diffraction >Mechanism and kinetics of early transition metal hydrides, oxides, and chlorides to enhance hydrogen release and uptake properties of MgH2
【24h】

Mechanism and kinetics of early transition metal hydrides, oxides, and chlorides to enhance hydrogen release and uptake properties of MgH2

机译：早期过渡金属氢化物，氧化物和氯化物增强MgH2的氢释放和吸收特性的机理和动力学

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Selected hydrides (TiH2, ZrH2), chlorides (VCl3, ScCl3) or oxides (V2O5) utilized as additives facilitating hydrogen release and uptake for magnesium hydride were investigated using mechanochemical treatment and in-situ synchrotron radiation powder X-ray diffraction studies. The fastest hydrogen desorption and absorption kinetics for MgH2 was observed for a sample with 5 mol% V2O5 at 320 degrees C. Additional activation of the system (2 cycles, vacuum/p(H-2) similar to 150 bar, 450 degrees C) leads to significant improvement of the kinetics even at lower temperatures, 270 degrees C. The observed prolific effect is achieved through the full reduction of vanadium oxides and formation of an efficient vanadium catalyst as nanoparticles and possibly interfacial effects in the MgO/Mg/MgH2/V system introduced during cycling hydrogen release and uptake in hydrogen/dynamic vacuum at 450 degrees C. Nanostructuring as well as hydrogen permeability via vanadium nanoparticles may improve kinetics and reduce the apparent activation energy for hydrogen release. Thus, the enhancement of hydrogen release/uptake in the MgH2 owe to "in situ" formation of vanadium nanoparticles by reduction of V2O5. (C) 2015 International Centre for Diffraction Data.
机译：通过机械化学处理和原位同步加速器辐射粉末X射线衍射研究，研究了用作促进氢释放和吸收氢化镁的添加剂的选定氢化物（TiH2，ZrH2），氯化物（VCl3，ScCl3）或氧化物（V2O5）。在320摄氏度下，对于含5 mol％V2O5的样品，观察到MgH2最快的氢气脱附和吸收动力学。系统的其他激活（2个循环，真空/ p（H-2）类似于150 bar，450摄氏度）即使在较低的温度（270摄氏度）下，也可以显着改善动力学。观察到的高产效应是通过完全还原钒氧化物并形成有效的钒催化剂作为纳米粒子以及在MgO / Mg / MgH2 /中产生界面效应而实现的。在循环氢气释放和在450摄氏度的氢气/动态真空中吸收过程中引入V系统。纳米结构以及通过钒纳米颗粒的氢气渗透性可改善动力学并降低用于氢气释放的表观活化能。因此，由于通过还原V 2 O 5而“原位”形成钒纳米颗粒，MgH 2中氢释放/吸收的增强。 （C）2015年国际衍射数据中心。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号