Abstract: Three types of bimodal supports with gradient distribution of the most probable macropore diameter and macropore volume ratio were prepared as catalysts, and the effect of bimodal pores on the physicochemical properties and performance of the catalyst was investigated. The results show that the metal dispersion on the catalyst is lower than that of the residue hydrotreating carbon residue catalyst prepared by single peak pore support. Because of the reduction of the specific surface area of the bimodal pore carrier and the decrease of the number of hydroxyl groups, the interaction between metal and the support is weak, and the average length of the sulfided active phase and the average number of stacked layers are high. With the decrease of the ratio of the volume of macropores to total pore volume, the activity of the catalyst for desulfurization and carbon residue removal increases.

Key words: residue, carbon residue removal, support, bi-modal pore structure