Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1627217 | Journal of Alloys and Compounds | 2006 | 4 Pages |
Abstract
Kinetics of hydrogen absorption and desorption reactions was investigated on the MgH2 composite doped with 1 mol% Nb2O5 as a catalyst by ballmilling. The composite after dehydrogenation at 200 °C absorbed gaseous hydrogen of ∼4.5 mass% even at room temperature under lower pressure than 1 MPa within 15 s and finally its capacity reached more than 5 mass%. On the other hand, the catalyzed MgH2 after rehydrogenation desorbed ∼6 mass% hydrogen at 160 °C under purified He flow, which followed the first order reaction. From the Kissinger plot, the activation energy for hydrogen desorption was estimated to be ∼71 kJ/mol H2, indicating the product was significantly activated due to the catalytic effect of Nb2O5.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Nobuko Hanada, Takayuki Ichikawa, Satoshi Hino, Hironobu Fujii,