Abstract
Although 1,4-bis(phenylthynyl)benzene (DEB) blended with a carbon supported palladium catalyst (Pd/C) is one of the most widely used irreversible hydrogen getter in a closed environment, it is hard to form and easy to burn. To overcome these deficiencies of this powdery DEB-Pd/C hydrogen getter, a DEB-Pd/C/LDPE porous hydrogen absorbing composite has been developed in our group. In the present work, hydrogen absorption aging mechanisms of this porous hydrogen absorbing composite samples are investigated by using a accelerated aging test method, their hydrogen absorption performances are measured by hydrogen absorption experiments, and their aging mechanisms are studied by X-ray diffraction, attenuated total reflection-Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and field emission transmission electron microscope. The results show that both the hydrogen absorption rate and the hydrogen absorption capability of each aging composite sample decrease with the increasing of storage time. The results also show that the decrease of its hydrogen absorption rate is mainly attributed to both the surface migration of its DEB and the surface oxidation of its Pd catalyst, and the decrease of its hydrogen absorption capacity is mainly attributed to the surface migration of its DEB.
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