关键词: 催化剂, 加氢, 渣油, 氧化铝, 羟基

Abstract:

As the demand for crude oil continues growing, the efficient utilization of inferior residue has become an important issue to be addressed. In the present study, two NiMo/Al₂O₃ catalysts (CAT-1 and CAT-2) are prepared using different methods, and their performance in hydrotreating reaction of inferior residue is systematically investigated. CAT-1 exhibits better catalytic performance than CAT-2 in hydrodesulfurization, conradson carbon residue reduction and hydrodemetalization reactions, with improvements of 10.33%, 8.94% and 1.05% respectively. In addition, CAT-1 also has a residue conversion rate 3.46% higher than CAT-2. The superior catalytic performance of CAT-1 is closely related to its high hydroxyl content. More hydroxyl groups weaken the interaction between support and metal species, which makes it easier to reduce Mo⁶⁺ to Mo⁴⁺, resulting in the formation of Type Ⅱ active phases with a higher degree of sulfurization and higher hydrogenation activity. The increase in hydroxyl content also provides more active sites for hydrogenation reaction and effectively improves dispersion of metal species, the acidity of catalyst and the redox properties of metal species. The present study provides theoretical basis and technical support for the efficient conversion of residue.

Key words: catalyst, hydrogenation, residua, alumina, hydroxyl