Abstract: Five kinds of guard catalysts were designed along the flow direction by using different special-shaped catalysts, such as filamentous foam, honeycomb cylinder and Raschig ring. The catalyst has a large bed voidage.Along the flow direction, the bed voidage and pore size are gradually reduced and the active metal content is gradually increased. Outstanding gradation in bed voidage, pore properties and activity can better relieve the impurity removal pressure of the catalyst in the bed of demetallization catalyst, avoid the catalyst hardening at the junction of the guard catalyst and the demetallization catalyst, and ensure the stable and long time operation of the device. The removal rates of Fe and Ca of the self-made guard catalysts are better than those of reference catalyst, and self-made guard catalysts show certain removal ability of Ni, V, CCR and S. There is no pressure drop in the whole process of long period experiment, and the temperature increase during the test process is low.

Key words: residue hydrotreating, guard catalyst, special-shaped, grading