Abstract
The effect of pretreatment on the dispersion of Pd catalysts supported on silica has been studied. The catalysts were prepared from [Pd(NH3)4] (NO3)2 as the metal precursor at a pH = 9. The resulting catalysts were characterized using both CO and H2 chemisorption, transmission electron microscopy, and in-situ UV reflectance spectroscopy. Pretreatment in H2 resulted in poor Pd dispersions while pretreatment in He or Ar resulted in very high dispersions. Pretreatment in O2 resulted in moderate dispersions. The results are explained by considering the chemical structure of the adsorbed surface complex under different pretreatment conditions. The chemistry of the decomposition process is considered in detail.
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Zou, W., Gonzalez, R.D. The preparation of silica supported Pd catalysts: the effect of pretreatment variables on particle size. Catal Lett 12, 73–86 (1992). https://doi.org/10.1007/BF00767190
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DOI: https://doi.org/10.1007/BF00767190