HYDROGEN STORAGE CHARACTERIZATION OF HYDROTALCITEDERIVED REDUCED MIXED OXIDES

Hydrotalcites compound have received much attention and view of their potential
applications as adsorbents, as anion exchangers, in nucleophilic halide exchanger and
most importantly as catalyst support. The synthesis and characterization of
hydrotalcite-like compound (HTLcs) for hydrogen storage purposes is described. The
HTLcs is synthesized by using Magnesium Nitrate Hexahydrate and Aluminium
Nitrate Nanohydrate as the starting material by coprecipitation with sodium
carbonate. The characterization analysis on the HTLcs synthesized is carried out by
using Powder X-ray Diffraction (XRD), and Fourier Transform Infrared
Spectroscopy. This study also focuses on the effect of thermal treatment on HTLcs
during calcinations process which formed a mixed oxides compound. After that, the
adsorption/desorption behavior study of H2 on HTLcs is conducted by using
Temperature programmed reduction (TPR )/Temperature Programmed Desorption
(TPD).According to the FTTRanalysis before and after adsorption, it was found that
there is a significant amount of H2 adsorbed after the mixed oxides reduced under
hydrogen flow for a period of time. This outcome also supported by the H2
consumption curve obtained in TPR analysis where it has shown that H2 adsorption
occur on metal formed after an amount of reducible mixed oxides completely
reduced. Furthermore, during TPD analysis, it was found that small amount of H2
desorbed with low rate ofadsorption.