Hydrogenation properties of mechanically milled Mg2Ni0.8Cr0.2-CoO／Al2O3 composites

• Published in: Journal of Zhejiang University. B. Science Vol. 6; no. 3; pp. 208 - 212
• Main Author: 王秀丽 涂江平 陈长聘
• Format: Journal Article
• Language: English
• Published: China Springer Nature B.V 01.03.2005; Zhejiang University Press
• Subjects: Absorption; Aluminum oxide; Aluminum Oxide - analysis; Aluminum Oxide - chemistry; Ball milling; Catalysts; Chemical synthesis; Composite materials; Hot Temperature; Hydrogen - analysis; Hydrogen - chemistry; Hydrogenation; Kinetics; Magnesium Compounds - analysis; Magnesium Compounds - chemistry; Manufactured Materials - analysis; Materials and Chemical Engineering; Materials Testing; Mg2Ni0.8Cr0.2-CoO／Al2O3; Molecular Conformation; Nitrogen Compounds - analysis; Nitrogen Compounds - chemistry; Pressure; Temperature; 储氢合金; 催化剂; 合成物; 球磨机; 镁镍基化合物
• ISSN: 1673-1581; 1862-1783
• DOI: 10.1631/jzus.2005.B0208

Mg2Ni0.8Cro.2-x wt.% CoO/Al2o3 (x=0.5, 1, 2 and 3) composites were prepared by mechanically milling sintered Mg2Ni0.8Cr0.2 alloy and CoO/Al2O3 compound for 45 h, The addition of CoO/Al2O3 compound resulted in the good kinetics properties of hydriding/dehydriding reaction of the composites. The composite with 1.0 wt.% CoO/Al2O3 catalyst could reach the maximum hydrogen absorption capacity (2.9 wt.%) within 5 min at 393 K under HE pressure of 4 MPa, and can desorb rapidly at 493 K. The decomposition and synthesis of hydrogen molecule on MgENi0.8Cr0.2 alloy surface was promoted by addition of CoO/Al2O3 catalyst. In addition, the formation of metallic Ni particles, strain and defects during the ball milling process also resulted in the improved hydrogenation performance of Mg2Ni-based alloys.