Abstract
A series of WS2/Al2O3 catalysts containing a varied amount of phosphorus (0.0,2.5 and 6.0 wt% P2O5), sulfided at two different temperatures (873 and 1073 K), were studied by means of high-resolution transmission electron microscopy (HRTEM). The stacking of (002) layers in the WS2-2H crystallites of the “rag” structure increases with the addition of phosphorus, whereas its length is kept almost constant. At high sulfidation temperatures phosphorus shows a stabilizing effect on the catalysts by retarding the stacking growth of WS2 crystallites. Additionally, an aluminum phosphate crystalline phase is identified in the phosphorus promoted catalysts.
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Cruz-Reyes, J., Lopez-Agudo, A., Lopez-Cordero, R. et al. Phosphorus promoted WS2/Al2O3 catalysts studied by transmission electron microscopy. Catal Lett 42, 119–126 (1996). https://doi.org/10.1007/BF00810676
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DOI: https://doi.org/10.1007/BF00810676