关键词: 纳米自组装, 催化剂, 氧化铝, 渣油, 贯穿, 扩散

Abstract: A nano-alumina with build-up framework pore structure and high penetrating diffusion property was prepared by secondary nano-assembly technique. Said mesoporous alumina support was impregnated with solution containing Ni-Mo active metals to obtain a hydrodemetallization catalyst having a pore volume of 1.65 cm3/g, a specific surface area of 407 m2/g and an average pore diameter of 16.2 nm. The demetallization performance of the catalyst was evaluated under residue feed hydrotreating conditions. Results showed that Ca and V could be precipitated evenly on the mesoporous alumina support and some cylindrical metal deposits were formed in the channels. After running 3 000 h, the amount of deposited metals reached 19.0%; the pore volume of the used catalyst was still 0.793 cm3/g with porosity of 80.4%, in which over 95.3% of the pores were larger than 10 nm, indicating that the pore structure of this mesoporous alumina support was favorable for asphaltene micelles to penetrating diffuse in the build-up passages.

Key words: nano-assembly, catalyst, aluminum oxide, residue, penetration, diffusion