Adsorption of hydrogen on Ni and NiTiO2 composite ultrafine particles

The adsorption of hydrogen on Ni and NiTiO 2 composite ultrafine particles (UFPs) was studied by temperature-programmed desorption (TPD) experiments. The desorption characteristics of hydrogen on Ni and NiTiO 2 composite UFPs were similar to those of a Ni single crystal or polycrystal. The amount of adsorption of hydrogen on NiTiO 2 composite UFPs was dependent upon the temperature of exposure, and the phenomenon attributed to the spillover of hydrogen from Ni onto TiO 2 . The CO hydrogenation reaction on NiTiO 2 composite UFPs proceeded above 373 K. TPD spectra showed new desorption peaks after the catalytic reaction above 373 K and suggested the formation of new adsorption states.