Synthesis and characterization of mesoporous PdPtCr alloy and its influence on the hydrogen kinetics in MgH2

The compounds made of MgH2 and (1 and 5 wt.%) Pd40Pt30Cr30 catalyst by mechanical milling were tested for their ability to absorb and desorb hydrogen. The mesoporous Pd40Pt30Cr30 was obtained by the reduction of chloride complexes and using a surfactant solution. The absorption kinetic tests showed that the MgH2 + 1 wt.% Pd40Pt30Cr30 sample attained 90% of hydrogen capacity around 10 min, at 350 degrees C. The desorption tests showed that the MgH2 + 5 wt.% Pd40Pt30Cr30 sample desorbed completely in about 5 min at the same temperature. The highest hydrogen capacity, 6.8 wt.% of H-2, was determined by absorption/desorption P-C-Isotherm curves at 300 degrees C for MgH2 + 1 wt.% Pd40Pt30Cr30 sample. The MgH2 + 5 wt.% Pd70Pt30 was used in the hydrogenation tests to elucidate the fact that the presence of CrCl3 in the Pd40Pt30Cr30 alloy mixed to MgH2, leads to an increase in the hydrogen total capacity of absorption. (c) 2012 Elsevier B.V. All rights reserved.