Phosphorus Introduction into Industrial Catalyst Formulations

Impact of Phosphorus Introduction into Industrial Catalyst Formulations 

The advantages of phosphorus addition to catalyst formulations found in patents can be approximately categorized as follows (i) optimization of the catalyst pore structure by addition of phosphorus to be applied with certain types of feedstocks such as residual oil, (ii) optimization of the dispersion of Co(Ni) I Mo-containing phases by the presence of phosphorus, (iii) optimization of synergistic effects resulting from complex chemical combinations of phosphorus and other incorporated elements, (iv) optimization of catalyst preparation by use of specific phosphorus precursors, and (v) the use of phosphorus-containing catalysts under specific reaction conditions or processes as well as their use in combination with other hydrotreating catalysts. 

Considering the positive effects of phosphorus described here, it is expected that investigations of phosphorus in hydrotreating catalysts will continue and commercial appheations will increase. 

The catalyst phosphorus content, the nature of the phosphorus precursor used in the preparation, and the method of phosphorus introduction all significantly affect the textural and structural properties of the final catalysts. Therefore, it is important to determine the optimum preparation and activation conditions of hydrotreating catalysts. In particular, pH of the preparative solution and the P/Mo ratio are important factors, but many other factors arc also important. 

Influence of Phosphorus on Textural and Structural Modifications of Catalysts 

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IX. Impact of Phosphorus Introduction into Industrial Catalyst Formulations... 

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