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The role of destabilization of palladium hydride in the hydrogen uptake of Pd-containing activated carbons

机译：氢化钯不稳定在含Pd活性炭吸氢中的作用

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摘要

This paper reports on differences in stability of Pd hydride phases in palladium particles with various degrees of contact with microporous carbon supports. A sample containing Pd embedded in activated carbon fibre (2 wt% Pd) was compared with commercial Pd nanoparticles deposited on microporous activated carbon (3 wt% Pd) and with support-free nanocrystalline palladium. The morphology of the materials was characterized by electron microscopy, and the phase transformations were analysed over a large range of hydrogen partial pressures (0.003-10 bar) and at several temperatures using in situ x-ray diffraction. The results were verified with volumetric hydrogen uptake measurements. Results indicate that higher degrees of Pd-carbon contacts for Pd particles embedded in a microporous carbon matrix induce efficient 'pumping' of hydrogen out of _-PdH_x. It was also found that thermal cleaning of carbon surface groups prior to exposure to hydrogen further enhances the hydrogen pumping power of the microporous carbon support. In brief, this study highlights that the stability of __-PdH_x phase supported on carbon depends on the degree of contact between Pd and carbon and on the nature of the carbon surface.
机译：本文报道了与微孔碳载体不同程度接触的钯颗粒中钯氢化物相稳定性的差异。将包含嵌入活性炭纤维中的Pd（2 wt％Pd）的样品与沉积在微孔活性炭上的市售Pd纳米颗粒（3 wt％Pd）和不含载体的纳米晶钯进行了比较。通过电子显微镜表征材料的形态，并使用原位X射线衍射在大范围的氢分压（0.003-10 bar）和几个温度下分析相变。通过体积氢吸收测量来验证结果。结果表明，嵌入微孔碳基体中的Pd颗粒的Pd-碳接触程度更高，可以有效地从_-PdH_x中抽出氢。还发现在暴露于氢之前对碳表面基团进行热清洁进一步增强了微孔碳载体的氢泵送能力。简而言之，这项研究强调了碳负载的__- PdH_x相的稳定性取决于Pd与碳之间的接触程度以及碳表面的性质。

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