We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Temperature programmed analysis of hydrogenation and dehydrogenation of magnesium (Mg), nickel (Ni) and aluminum (Al) containing mixed oxides.
- Authors
Salam, M. Abdus; Abdullah, Bawadi; Islam, M. Aminul
- Abstract
Hydrotalcite derived magnesium (Mg), nickel (Ni), and aluminum (Al) containing a mixed oxide of Mg 0.5 Ni 0.25 Al 0.25 O 1.13 has been synthesized using co-precipitation method. Hydrogenation and dehydrogenation of Mg 0.5 Ni 0.25 Al 0.25 O 1.13 mixed oxide has been studied using conventional temperature programmed reduction (TPR) and temperature programmed desorption (TPD) method. ICP-MS analysis ensured the composition of metals in a solid solution of mixed oxides. Surface composition was confirmed via EDX analysis. Different oxide, spinel phases were predicted by the X-ray diffraction (XRD) and FT-IR analyses. Temperature-programmed reduction/desorption analyses showed remarkable hydrogenation and dehydrogenation at near ambient conditions. Reduced mixed oxides showed significant hydrogenation at a temperature range of 0–180 °C. X-ray diffractogram and FTIR spectroscopy predicted the hydrogenated phases of MgH 2 and Mg 2 NiH 4 as a stable product of hydrogenation. The analyses correspond the physical and chemical adsorption in whole hydrogenation process of Mg 0.5 Ni 0.25 Al 0.25 O 1.13 mixed oxides. The activation energy of dehydrogenation is 60 kJ/mol which indicate the formation of reversible hydride phases of MgH 2 and Mg 2 NiH 4 .
- Subjects
HYDROGENATION; DEHYDROGENATION kinetics; MAGNESIUM alloys; MIXTURES; EFFECT of temperature on metals
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2017, Vol 118, p103
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2016.10.039