Hydrogenation properties of mechanically milled Mg2Ni0.8Cr0.2-CoO/Al2O3 composites
| Autor: | Chang-pin Chen, Jiangping Tu, Xiuli Wang, Xin-bing Zhao, Xiao-bin Zhang |
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| Rok vydání: | 2005 |
| Předmět: |
Hot Temperature
Manufactured Materials Materials science Hydrogen Alloy Composite number Molecular Conformation Magnesium Compounds chemistry.chemical_element engineering.material General Biochemistry Genetics and Molecular Biology Absorption Catalysis Materials and Chemical Engineering Metal Hydrogen storage Desorption Materials Testing Aluminum Oxide Pressure General Pharmacology Toxicology and Pharmaceutics Composite material Nitrogen Compounds Ball mill General Veterinary Temperature General Medicine Kinetics chemistry visual_art visual_art.visual_art_medium engineering |
| Zdroj: | Journal of Zhejiang University-SCIENCE B. 6:208-212 |
| ISSN: | 1862-1783 1673-1581 |
| DOI: | 10.1631/jzus.2005.b0208 |
| Popis: | Mg2Ni0.8Cr0.2-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 H2 pressure of 4 MPa, and can desorb rapidly at 493 K. The decomposition and synthesis of hydrogen molecule on Mg2Ni0.8Cr0.2 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. |
| Databáze: | OpenAIRE |
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