Vanadium catalyst particle size effect

Fig. 49. Effect of catalyst particle size on vanadium deposition for an Arabian Heavy atmospheric residuum processed at 370° (700°F) under 12.59 MPa (1825 psia) of hydrogen (Tamm et al., 1981).

Crystalline strontium titanate has no pore structure and its effectiveness as a vanadium trap is reliant vpoi maximizing its external surface area. This is achieved by reducing the average particle size of the tr, by milling and classlflcaticxi, to levels ccnparable with other catalyst ingredients. 

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