Structural Models of Phosphorus-Containing Hydrotreating Catalysts

Structural Models of Phosphorus-Containing Hydrotreating Catalysts 

Structural models of phosphorus-containing hydrotreating catalysts have been proposed from catalyst characterization data and results characterizing the reactions of model compounds. Poulet et al. (79) reported a structural model of MoP/Al catalysts (Fig. 35) in which the phosphorus-containing species exist in three different states (i) isolated phosphorus oxo-species interacting with the alumina support, (ii) phosphorus directly incorporated into the M0S2 slab, and (iii) phosphorus oxo-species bound to both M0S2 and the alumina surface. 

Mangnus et al. (70) proposed a structural model for Co—Mo — P/Al catalysts (Fig. 36) whereby phosphorus exists mainly as AIPO4 on the alumina surface. In this model, a fraction of the molybdenum sites at the edges of the M0S2 slabs interact with AIPO4 through complex 

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VII. Structural Models of Phosphorus-Containing Hydrotreating Catalysts... 

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