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Substantial hydrogen absorption in nanometer-sized palladium crystallites on a thin film alumina support is observed at 90--3500.3em0exK under low H₂ pressure conditions (<2×10^-30.3em0exPa) by ¹H(¹⁵N,αγ)¹²C nuclear reaction analysis. The enthalpy of H solution varies with the absorbed H content and with -(0.28±0.02)0.3em0exeV∕H exceeds that of bulk Pd at H∕Pd ratios below 0.20. By resolving absorbed H from surface-adsorbed H, this enhanced H stability is identified as an intrinsic volume property of the small crystallites rather than being associated with particular binding sites on or near their surfaces.
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Wilde et al. (2008) studied this question.
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