Abstract
Molecularly adsorbed dihydrogen (H-H) species were observed on ZrO 2 by Fourier-transform infrared (FT-IR) spectroscopy in the temperature range of 85–300 K. The IR spectra show that there are three types of H 2(a) species giving absorption bands at 4054, 4031 and 3996 cm −1. In case of HD and D 2, these bands shift to 3539, 3518 and 3485 cm −1, and 2914, 2897 and 2866 cm −1, respectively. The nature of these three species differ from one another. It is also found that the species which gives the band at 4029 cm −1 is the most stable adsorbate and that this species shares the same adsorption site with the ZrH and OH species resulting from the heterolytic dissociative adsorption of H 2 on the Zr-O pair site.
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