2018 Volume 97 Issue 8 Pages 240-244
In this paper, we fabricated spherical molybdosilicic acid-silica composite particles via sol-gel based method, and their ability for acid promoted hydrolytic dehydrogenation of ammonia borane. The morphological homogeneity of the spherical particles slightly increased with increasing amount of ammonia using in the preparation process. The intensity of IR bands assigned as Mo-O bond in the spectrum of the spherical particles prepared with highest amount of ammonia after calcination was relatively high compared with the intensity in the spectra of the particles prepared with lower amount of ammonia from the results of Fourier transform infrared spectroscopy (FTIR), indicating that parts of immobilized molybdsilicic acid molecules in the solution with high pH value were broken after calcination. The amount of hydrogen evolution from aqueous ammonia borane solution depends on the samples, and the morphologically homogeneous spherical particles stably immobilizing molybdsilicic acid molecules showed high activity for hydrogen evolution from aqueous ammonia borane solution.
